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www.sii-ic.com FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK © Seiko Instruments Inc., 2011-2015 Rev.2.2_00 Seiko Instruments Inc. 1 The S-35390A H Series is a 105 °C operation CMOS 2-wire real-time clock IC which operates with the very low current consumption in the wide range of operation voltage. The operation voltage is 1. 3 V to 5.5 V so that the S-35390A H Series can be used for various power supplies from main supply to backup battery. Due to the 0.25 μA current consumption and wide range of power supply voltage at time ke eping, the S-35390A H Series makes the battery life longer. In the system which operates with a backup battery, the included free registers c an be used as the function for user's backup memory. Users always can take back the information in the registers which is stored before power-off the main power supply, after the voltage is restored. The S-35390A H Series has the function to correct advance / delay of the clock data speed, in the wide range, which is caused by the crystal oscillation circuit's frequency deviation. Correcting according to the temperature change by combining this function and a temperature sensor, it is possible to ma ke a high precise clock function which is not affected by the ambient temperature. Caution This product can be used in vehicle equipment and in-vehicle equipment. Before using the product in the purpose, contact to SII is indispensable.  Features

  • Low current consumption: 0.25 μA typ. (VDD = 3.0 V, Ta = +25°C)
  • Wide range of operating voltage: 1.3 V to 5.5 V
  • Built-in clock correction function
  • Built-in free user register
  • 2-wire (I 2C-bus) CPU interface
  • Built-in alarm interrupter
  • Built-in flag generator during detection of low power voltage or at power-on
  • Auto calendar up to the year 2099, aut omatic leap year calculation function
  • Built-in constant voltage circuit
  • Built-in 32.768 kHz crystal oscillator (built-in C d, external Cg)
  • Operating temperature range: Ta = −40°C to +105°C
  • Lead-free (Sn 100%), halogen-free
  • AEC-Q100 qualified *1 *1. Contact our sales office for details.  Packages
  • 8-Pin SOP (JEDEC)
  • 8-Pin TSSOP

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 2  Block Diagram Real-time data register Status register 1 SCL SDA Low power supply voltage detector VDD VSS Comparator 1 Shift register Serial interface XIN XOUT INT2 Comparator 2 Clock correction register INT1 controller Divider, timing generator INT2 controller Constant-voltage circuit Status register 2 INT1 register INT2 register Power-on detection circuit Free register INT1 Day Month Year Day of the weekMinute HourSecond Oscillation circuit Figure 1

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 3  AEC-Q100 Qualified This IC supports AEC-Q100 for the operation temperature grade 2. Contact our sales office for details of AEC-Q100 reliability specification.  Product Name Structure 1. Product name S-35390A H - xxxx U Operating temperature H: Ta = −40°C to +105°C Product name Environmental code U: Lead-free (Sn 100%), halogen-free Package name (abbreviation) and IC packing specification*1 J8T2: 8-Pin SOP (JEDEC), Tape T8T2: 8-Pin TSSOP, Tape *1. Refer to the tape drawing. 2. Packages Table 1 Package Drawing Codes Package Name Dimension Tape Reel 8-PinSOP (JEDEC) FJ008-A-P-SD FJ008-D-C-SD FJ008-D-R-S1 8-Pin TSSOP FT008-A-P-SD FT008-E-C-SD FT008-E-R-S1

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 4  Pin Configurations 1. 8-Pin SOP (JEDEC) Top view Figure 2 S-35390AH-J8T2U 2. 8-Pin TSSOP Top view Figure 3 S-35390AH-T8T2U Table 2 List of Pins Pin No Symbol Description I/O Configuration 1 1INT Output pin for interrupt signal 1 Output Nch open-drain output (no protective diode at VDD)

2 XOUT Connection pins

3 XIN

4 VSS GND pin − −

interrupt signal 2 Output Nch open-drain output (no protective diode at VDD)

6 SCL Input pin for

serial clock Input CMOS input (no protective diode at VDD)

7 SDA I/O pin for serial

(no protective diode at VDD) CMOS input

8 VDD Pin for positive

power supply − −

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 6  Absolute Maximum Ratings Table 3 Item Symbol Applied Pin Absolute Maximum Rating Unit Power supply voltage V DD − V SS − 0.3 to VSS + 6.5 V Input voltage V IN SCL, SDA V SS − 0.3 to VSS + 6.5 V Output voltage V OUT SDA, INT1, INT2 V SS − 0.3 to VSS + 6.5 V Operating ambient temperature*1 Topr − −40 to +105 °C Storage temperature T stg − −55 to +125 °C *1. Conditions with no condensation or frost. Condensation or fr ost causes short-circuiting between pins, resulting in a malfunction. Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions.  Recommended Operation Conditions Table 4 (VSS = 0 V) Item Symbol Condition Min. Typ. Max. Unit Power supply voltage*1 VDD Ta = −40°C to +105°C 1.3 3.0 5.5 V Time keeping power supply voltage*2 VDDT Ta = −40°C to +105°C V DET − 0.05 − 5.5 V Crystal oscillator CL value C L − − 6 7 pF *1. The power supply voltage that allows communication under the conditions shown in Table 9 of " AC Electrical Characteristics". *2. The power supply voltage that allows time keeping. For the relationship with VDET (low power supply voltage detection voltage), refer to " Characteristics (Typical Data)".  Oscillation Characteristics Table 5 (Ta = +25°C, VDD = 3.0 V, VSS = 0 V, DMX-26S crystal oscillator (CL = 6 pF, 32.768 kHz) manufactured by Daishinku corp.) Item Symbol Condition Min. Typ. Max. Unit Oscillation start voltage V STA Within 10 seconds 1.1 − 5.5 V Oscillation start time t STA − − − 1 s IC-to-IC frequency deviation*1 δIC − −10 − +10 ppm Frequency voltage deviation δV V DD = 1.3 V to 5.5 V −3 − +3 ppm/V External capacitance C g Applied to XIN pin − − 9.1 pF Internal oscillation capacitance C d Applied to XOUT pin − 8 − pF *1. Reference value

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 7  DC Electrical Characteristics Table 6 DC Characteristics (V DD = 3.0 V) (Ta = −40°C to +105°C, VSS = 0 V, DMX-26S crystal oscillator (CL = 6 pF, 32.768 kHz, Cg = 9.1 pF) manufactured by Daishinku corp.) Item Symbol Applied Pin Condition Min. Typ. Max. Unit Current consumption 1 I DD1 − Out of communication − 0.25 1.2 μA Current consumption 2 I DD2 − During communication (SCL = 100 kHz) − 6 14 μA Input current leakage 1 I IZH SCL, SDA V IN = VDD −0.5 − 0.5 μA Input current leakage 2 I IZL SCL, SDA V IN = VSS −0.5 − 0.5 μA Output current leakage 1 I OZH SDA, 1INT , 2INT VOUT = VDD −0.5 − 0.5 μA Output current leakage 2 I OZL SDA, 1INT , 2INT VOUT = VSS −0.5 − 0.5 μA Input voltage 1 V IH SCL, SDA − 0.8 × VDD − V SS + 5.5 V Input voltage 2 V IL SCL, SDA − V SS − 0.3 − 0.2 × VDD V Output current 1 I OL1 1INT , 2INT VOUT = 0.4 V 3 5 − mA Output current 2 I OL2 SDA V OUT = 0.4 V 5 10 − mA Power supply voltage detection voltage VDET − − 0.60 1 1.35 V Table 7 DC Characteristics (V DD = 5.0 V) (Ta = −40°C to +105°C, VSS = 0 V, DMX-26S crystal oscillator (CL = 6 pF, 32.768 kHz, Cg = 9.1 pF) manufactured by Daishinku corp.) Item Symbol Applied Pin Condition Min. Typ. Max. Unit Current consumption 1 I DD1 − Out of communication − 0.3 1.4 μA Current consumption 2 I DD2 − During communication (SCL = 100 kHz) − 14 30 μA Input current leakage 1 I IZH SCL, SDA V IN = VDD −0.5 − 0.5 μA Input current leakage 2 I IZL SCL, SDA V IN = VSS −0.5 − 0.5 μA Output current leakage 1 I OZH SDA, 1INT , 2INT VOUT = VDD −0.5 − 0.5 μA Output current leakage 2 I OZL SDA, 1INT , 2INT VOUT = VSS −0.5 − 0.5 μA Input voltage 1 V IH SCL, SDA − 0.8 × VDD − V SS + 5.5 V Input voltage 2 V IL SCL, SDA − V SS − 0.3 − 0.2 × VDD V Output current 1 I OL1 1INT , 2INT VOUT = 0.4 V 5 8 − mA Output current 2 I OL2 SDA V OUT = 0.4 V 6 13 − mA Power supply voltage detection voltage VDET − − 0.60 1 1.35 V

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 9  Configuration of Data Communication 1. Data communication For data communication, the master device in the system generates a start condition for the S-35390A H Series. Next, the master device transmits 4-bit device code "0110", 3-bi t command and 1-bit read / write command to the SDA line. After that, output or input is performed from B7 of data. If data I/O has been completed, finish communication by inputting a stop condition to the S-35390A H Series. The master device generates an acknowledgment signal for every 1-byte. Regarding details, refer to "  Serial Interface". Command 0 1 1 0 C2 C1 C0 R / W Device code ACK Read / write bit Acknowledgment bit B7 B6 B5 B4 B3 B2 B1 B0 ACK Start condition Stop condition 1-byte data STA STP Figure 9 Data Communication

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 10 2. Configuration of command 8 types of command are available for the S-35390A H Series, The S-35390A H Series reads / writes the various registers by inputting these codes and commands. The S-353 90A H Series does not perform any operation with any codes and commands other than those below. Table 10 List of Commands Device Code Command Data C2 C1 C0 Description B7 B6 B5 B4 B3 B2 B1 B0 0110 0 0 0 Status register 1 access RESET*1 24 / 12 SC0*2 SC1*2 INT1*3 INT2 *3 BLD *4 POC*4 0 0 1 Status register 2 access INT1FE INT1ME INT1AE 32kE INT2FE INT2ME INT2AE TEST*5 0 1 0 Real-time data 1 access (year data to) −*6 Y10 M10 D10 −*6 H10 m10 s10 Y20 −*6 D20 −*6 H20 m20 s20 Y40 −*6 −*6 −*6 PM / AM m40 s40 Y80 −*6 −*6 −*6 −*6 −*6 −*6 0 1 1 Real-time data 2 access (hour data to) H10 m10 s10 H20 m20 s20 PM / AM m40 s40 −*6 −*6 −*6 1 0 0 INT1 register access (alarm time 1: week / hour / minute) (INT1AE = 1, INT1ME = 0, INT1FE = 0) −*6 −*6 H10 m10 −*6 H20 m20 −*6 PM / AM m40 A1WE A1HE A1mE INT1 register access (output of user-set frequency) (INT1ME = 0, INT1FE = 1)

1 Hz 2 Hz 4 Hz 8 Hz 16 Hz SC2*2 SC3 *2 SC4*2

(alarm time 2: week / hour / minute) (INT2AE = 1, INT2ME = 0, INT2FE = 0) −*6 −*6 H10 m10 −*6 H20 m20 −*6 PM / AM m40 A2WE A2HE A2mE INT2 register access (output of user-set frequency) (INT2ME = 0, INT2FE = 1)

1 Hz 2 Hz 4 Hz 8 Hz 16 Hz SC5*2 SC6 *2 SC7*2

1 1 0 Clock correction register access V0 V1 V2 V3 V4 V5 V6 V7 1 1 1 Free register access F0 F1 F2 F3 F4 F5 F6 F7 *1. Write-only flag. The S-35390A H Series initializes by writing "1" in this register. *2. Scratch bit. This is a register which is available fo r read / write operations and can be used by users freely. *3. Read-only flag. Valid only when using the alarm function. When the alarm time matches, this flag is set to "1", and it is cleared to "0" when reading. *4. Read-only flag. "POC" is set to "1" when power is applied. It is cleared to "0" when reading. Regarding "BLD", refer to " Low Power Supply Voltage Detection Circuit". *5. Test bit for SII. Be sure to set to "0" in use. *6. No effect when writing. It is "0" when reading.

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 11  Configuration of Registers 1. Real-time data register The real-time data register is a 7-byte register that stores the data of year, month, day, day of the week, hour, minute, and second in the BCD code. To write / read real-time data 1 access, transmit / receive the data of year in B7, month, day, day of the week, hour, minute, second in B0, in 7-byte. When you skip the procedure to access the data of year, month, day, day of the week, read / write real-time data 2 accesses. In this case, transmit / receive the data of hour in B7, minute, second in B0, in 3-byte. The S-35390A H Series transfers a set of data of time to the real-time data register when it recognizes a reading instruction. Therefore, the S-35390A H Series keeps precise time even if time-carry occurs during the reading operation of the real-time data register. Year data (00 to 99) Month data (01 to 12) Day data (01 to 31) Hour data (00 to 23 or 00 to 11) Minute data (00 to 59) Second data (00 to 59) Y80Y40Y4 Y8 Y10 Y20Y2 Y1 B7 B0 M1 M2 M4 M8 M10 0 0 0 D1 D2 D4 D8 D10 D20 0 0 W1 W2 W4 0 0 0 0 0 H1 H4 H8 H10 H20H2 0 s2 s4 s8 s10 s20 s40 0 m8 m10 m20 m40 0 m4 m2 AM / PM Start bit of real-time data 2 data access Start bit of real-time data 1 data access Day of the week data (00 to 06) B7 B0 B7 B0 B7 B0 B7 B0 B7 B0 B7 B0 Figure 10 Real-Time Data Register

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 12 Year data (00 to 99): Y1, Y2, Y4, Y8, Y10, Y20, Y40, Y80 Sets the lower two digits of the Western calendar y ear (00 to 99) and links together with the auto calendar function until 2099. Month data (01 to 12): M1, M2, M4, M8, M10 Example: December (M1, M2, M4, M8, M10, 0, 0, 0) = (0, 1, 0, 0, 1, 0 ,0 ,0) Day data (01 to 31): D1, D2, D4, D8, D10, D20 The count value is automatically changed by the auto calendar function. 1 to 29: Feb. (leap year), 1 to 28: Feb. (non-leap year) Day of the week data (00 to 06): W1, W2, W4 A septenary up counter. Day of the week is counted in the order of 00, 01, 02, …, 06, and 00. Set up day of the week and the count value. Hour data (00 to 23 or 00 to 11): H1, H2, H4, H8, H10, H20, AM / PM In 12-hour mode, write 0; AM, 1; PM in the PM/AM bit. In 24-hour mode, users can write either 0 or 1. 0 is read when the hour data is from 00 to 11, and 1 is read when from 12 to 23. Example (12-hour mode): 11 p.m. (H1, H2, H4, H8, H10, H20, PM/AM , 0) = (1, 0, 0, 0, 1, 0, 1, 0) Example (24-hour mode): 22 (H1, H2, H4, H8, H10, H20, PM/AM , 0) = (0, 1, 0, 0, 0, 1, 1, 0) Minute data (00 to 59): m1, m2, m4, m8, m10, m20, m40 Example: 32 minutes (m1, m2, m4, m8, m10, m20, m40, 0) = (0, 1, 0, 0, 1, 1, 0, 0) Example: 55 minutes (m1, m2, m4, m8, m10, m20, m40, 0) = (1, 0, 1, 0, 1, 0, 1, 0) Second data (00 to 59): s1, s2, s4, s8, s10, s20, s40 Example: 19 seconds (s1, s2, s4, s8, s10, s20, s40, 0) = (1, 0, 0, 1, 1, 0, 0, 0)

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 13 2. Status register 1 Status register 1 is a 1-byte register that is used to display and set various modes. The bit configuration is shown below. RESET 12 / 24 R R R R / W R / W SC1 B6 B5 B4 B3 B2 B1 B0 BLD INT2 POC INT1SC0 R R / W W R: Read W: Write R / W: Read / write Figure 11 Status Register 1 B0: POC This flag is used to confirm whether the power is on. The power-on detection circuit operates at power-on and B0 is set to "1". This flag is read-only. Once it is read, it is automatically set to "0". When this flag is "1", be sure to initialize. Regarding the operation after power-on, refer to " Power-on Detection Circuit and Register Status". B1: BLD This flag is set to "1" when the power supply voltage decreases to the level of detection voltage (VDET) or less. Users can detect a drop in the power supply voltage. Once this flag is set to "1", it is not set to "0" again even if the power supply increases to the level of detection voltage (V DET) or more. This flag is read-only. When this flag is "1", be sure to initialize. Regarding the operation of the power supply voltage detection circuit, refer to "  Low Power Supply Voltage Detection Circuit". B2: INT2, B3: INT1 This flag indicates the time set by alarm and when the time has reached it. This flag is set to "1" when the time that users set by using the alarm interrupt function has come. The INT1 flag at alarm 1 interrupt mode and the INT2 flag at alarm 2 interrupt mode are set to "1". Set "0" in INT1AE (B5 in the status register 2) or in INT2AE (B1 in the status register 2) after reading "1" in the INT1 flag or in the INT2 flag. This flag is read-only. Once this flag is read, it is set to "0" automatically. B4: SC1, B5: SC0 These flags are SRAM type registers, they are 2 bits as a whole, can be freely set by users. B6: 24 / 12 This flag is used to set 12-hour or 24-hour mode. Set the flag ahead of write operation of the real-time data register in case of 24-hour mode. 0: 12-hour mode 1: 24-hour mode B7: RESET The internal IC is initialized by setting this bit to "1". This bit is write-only. It is always "0" when reading. When applying the power supply voltage to the IC, be sure to write "1" to this bit to initialize the circuit. Regarding each status of registers after initialization, refer to "  Register Status After Initialization".

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 14 3. Status register 2 Status register 2 is a 1-byte register that is used to display and set various modes. The bit configuration is shown below. INT1FE INT1ME R / W R / W 32kE B6 B5 B4 B3 B2 B1 B0 INT2MEINT2FEINT1AE R / W R / W R / W R / W R / W R / W INT2AE TEST R / W: Read / write Figure 12 Status Register 2 B0: TEST This is a test flag for SII. Be sure to set this flag to "0" in use. If this flag is set to "1", be sure to initialize to set "0". B1: INT2AE, B2 : INT2ME, B3 : INT2FE These bits are used to select the output mode for the 2INT pin. Table 11 shows how to select the mode. To use an alarm 2 interrupt, set alarm interrupt mode, then access the INT2 register. Table 11 Output Modes for 2INT Pin INT2AE INT2ME INT2FE 2INT Pin Output Mode 0 0 0 No interrupt −*1 0 1 Output of user-set frequency −*1 1 0 Per-minute edge interrupt −*1 1 1 Minute-periodical interrupt 1 (50% duty) 1 0 0 Alarm 2 interrupt *1. Don't care (both of 0 and 1 are acceptable). B4: 32kE, B5: INT1AE, B6: INT1ME, B7: INT1FE These bits are used to select the output mode for the 1INT pin. Table 12 shows how to select the mode. To use alarm 1 interrupt, access the INT1 register after setting the alarm interrupt mode. Table 12 Output Modes for 1INT Pin 32kE INT1AE INT1ME INT1FE 1INT Pin Output Mode 0 0 0 0 No interrupt 0 −*1 0 1 Output of user-set frequency 0 −*1 1 0 Per-minute edge interrupt 0 0 1 1 Minute-periodical interrupt 1 (50% duty) 0 1 0 0 Alarm 1 interrupt 0 1 1 1 Minute-periodical interrupt 2 1 −*1 −*1 −*1 32.768 kHz output *1. Don't care (both of 0 and 1 are acceptable).

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 15 4. INT1 register and INT2 register The INT1 and INT2 registers are to set up the output of user-set frequency, or to set up alarm interrupt. Users are able to switch the output mode by using the status register 2. If selecting to use the output mode for alarm interrupt by status register 2; these registers work as alarm-time data registers. If selecting the output of user-set frequency by status register 2; these registers work as data registers to set the frequency for clock output. From each INT1 and INT2 pin, a clock pulse and alarm interrupt are output. 4. 1 Alarm interrupt Users can set the alarm time (the data of day of the week, hour, minute) by using the INT1 and INT2 registers which are 3-byte data registers. The configuration of register is as well as the data register of day of the week, hour, minute, in the real-time data register; is expressed by the BCD c ode. Do not set a nonexistent day. Users are necessary to set up the alarm-time data according to the 12 / 24 hour mode that they set by using the status register 1. H8H4 H2 H1 A 1 m Em8 m4 m2 m1 H20 H10 m10 m20 m40 H8 H4H2H1 A 2 m Em8 m4m2m1 H20 H10 m10 m20 m40 AM / PM A1WE00 W4 W2 W1 B7 B0 0 0 INT1 register

00 W4W2W1 0

Figure 13 INT1 Register and INT2 Register (Alarm-Time Data) The INT1 register has A1WE, A1HE, A1mE at B0 in each byte. It is possible to make data valid; the data of day of the week, hour, minute which are in the corresponding byte; by setting these bits to "1". This is as well in A2WE, A2HE, A2mE in the INT2 register. Setting example: alarm time "7:00 pm" in the INT1 register (1) 12-hour mode (status register 1 B6 = 0) Set up 7:00 PM Data written to INT1 register Day of the week Hour 1 1 1 0 0 0 1 1 Minute 0 0 0 0 0 0 0 1 B 7 B 0 *1. Don't care (both of 0 and 1 are acceptable). (2) 24-hour mode (status register 1 B6 = 1) Set up 19:00 PM Data written to INT1 register Hour 1 0 0 1 1 0 1*2 1 Minute 0 0 0 0 0 0 0 1 B 7 B 0 *1. Don't care (both of 0 and 1 are acceptable). *2. Set up the PM/AM flag along with the time setting.

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 18  Power-on Detection Circuit and Register Status The power-on detection circuit operates by power-on the S-35390A H Series, as a result each register is cleared; each register is set as follows. Real-time data register: 00 (Y), 01 (M), 01 (D), 0 (day of the week), 00 (H), 00 (M), 00 (S) Status register 1: "01h" Status register 2: "80h" INT1 register: "80h" INT2 register: "00h" Clock correction register: "00h" Free register: "00h" "1" is set in the POC flag (B0 in the status register 1) to indicate that power has been applied. To correct the oscillation frequency, the status register 2 goes in the mode the output of user-set frequency, so that 1 Hz clock pulse is output from the 1INT pin. When "1" is set in the POC flag, be sure to initialize. The POC flag is set to "0" due to initialization so that the output of user-set frequency mode is cleared (Refer to " Register Status After Initialization"). For the regular operation of power-on detection circuit, as seen in Figure 20, the period to power-up the S-35390A H Series is that the voltage reaches 1.3 V within 10 ms after setting the IC’s power supply voltage at 0 V. When the power-on detection circuit is not working normally is; the POC flag (B0 in the status register 1) is not in "1", or 1 Hz is not output from the 1INT pin. In this case, power-on the S-35390A H Series once again because the internal data may be in the indefinite status. Moreover, regarding the processing right after power-on, refer to "  Flowchart of Initialization and Example of Real-time Data Set-up". Within 10 ms 1.3 V

0 V*1

*1. 0 V indicates that there are no potential differences between the VDD pin and VSS pin of S-35390A H Series. Figure 20 How to Raise the Power Supply Voltage

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 20  Low Power Supply Voltage Detection Circuit The S-35390A H Series has a low power supply voltage detection circuit, so that users can monitor drops in the power supply voltage by reading the BLD flag (B1 in the status regi ster 1). There is a hysteresis width of approx. 0.15 V typ. between detection voltage and release voltage (refer to "  Characteristics (Typical Data) "). The low power supply voltage detection circuit does the sampling operation only once in one sec for 15.6 ms. If the power supply voltage decreases to the level of detection voltage (V DET) or less, "1" is set to the BLD flag so that sampling operation stops. Once "1" is detected in the BLD flag, no sampling operation is performed even if the power supply voltage increases to the level of release voltage or more, and "1" is held in the BLD flag. Furthermore, the S-35390A H Series does not initialize the internal circuit even if "1" is set to the BLD flag. If the BLD flag is "1" even after the power supply voltage is recovered, the internal circuit may be in the indefinite status. In this case, be sure to initialize the circuit. Without initializing, if the next BLD flag reading is done after sampling, the BLD flag gets reset to "0". In this case, be sure to initialize although the BLD flag is in "0" because the internal circuit may be in the indefini te status. VDD BLD flag Stop Stop Stop Sampling pulse Hysteresis width

0.15 V approximately

15.6 ms 1 s 1 s Time keeping power supply voltage (min.) Figure 22 Timing of Low Power Supply Voltage Detection Circuit  Circuits Power-on and Low Power Supply Voltage Detection Figure 23 shows the changes of the POC flag and BLD flag due to VDD fluctuation. VDD BLD flag Status register 1 reading POC flag VSS Low power supply voltage detection voltage Low power supply voltage detection voltage Figure 23 POC Flag and BLD Flag

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 21  Correction of Nonexistent Data and End-of-Month When users write the real-t ime data, the S-35390A H Series checks it. In ca se that the data is invalid, the S-35390A H Series does the following procedures. 1. Processing of nonexistent data Table 13 Processing of Nonexistent Data Register Normal Data Nonexistent Data Result Year data 00 to 99 XA to XF, AX to FX 00 Month data 01 to 12 00, 13 to 19, XA to XF 01 Day data 01 to 31 00, 32 to 39, XA to XF 01 Day of the week data 0 to 6 7 0 Hour data*1 24-hour 0 to 23 24 to 29, 3X, XA to XF 00 12-hour 0 to 11 12 to 20, XA to XF 00 Minute data 00 to 59 60 to 79, XA to XF 00 Second data*2 00 to 59 60 to 79, XA to XF 00 *1. In 12-hour mode, write the PM/AM flag (B1 in hour data in the real-time data register). In 24-hour mode, the PM/AM flag in the real-time data register is omi tted. However in the flag of reading, users are able to read 0; 0 to 11, 1; 12 to 23. *2. Processing of nonexistent data, regarding second data, is done by a carry pulse which is generated in 1 second, after writing. At this point the carry pulse is sent to the minute-counter. 2. Correction of end-of-month A nonexistent day, such as February 30 and April 31, is set to the first day of the next month.

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 22  1INT Pin and 2INT Pin Output Mode These are selectable for the output mode for 1INT and 2INT pins; Alarm interrupt, the output of user-set frequency, per-minute edge interrupt output, minute-periodical interrupt output 1. In the 1INT pin output mode, in addition to the above modes, minute-periodical interrupt output 2 and 32.768 kHz output are also selectable. To switch the output mode, use the status register 2. Refer to "3. Status register 2 " in " Configuration of Registers". When switching the output mode, be careful of the output status of the pin. Especially, when using alarm interrupt / output of frequency, switch the output mode after setting "00h" in the INT1 / INT2 register. In 32.768 kHz output / per-minute edge interrupt output / minute-periodical interrupt output, it is unnecessary to set data in the INT1 / INT2 register for users. Refer to the followings regarding each operation of output modes. 1. Alarm interrupt output Alarm interrupt output is the function to output "L" from the 1INT / 2INT pin, at the alarm time which is set by user has come. If setting the pin output to "H", turn off the alarm function by setting "0" in INT1AE / INT2AE in the status register 2. To set the alarm time, set the data of day of the week, hour and minute in the INT1 / INT2 register. Refer to " 4. INT1 register and INT2 register" in " Configuration of Registers". 1. 1 Alarm setting of "W (day of the week), H (hour), m (minute)" OFF INT1AE / INT2AE mx Comparator Hx Wx INTx register alarm enable flag

  • AxHE = AxmE = AxWE = "1" Status register 2 setting
  • INT1 pin output mode 32kE = 0, INT1ME = INT1FE = 0
  • INT2 pin output mode INT2ME = INT2FE = 0 INT1 register INT2 register Alarm interrupt Second Minute Year Day of the week Day Month Real-time data W (day of the week) 01 s 59 s INT1 pin / INT2 pin Change by program Alarm time matches Period when alarm time matches Change by program H h 00 m 00 sH h (m − 1) m 59 s H h (m + 1) m 00 s Change by program Real-time data Hour *1. If users clear INT1AE / INT2AE once; "L" is not output from the 1INT / 2INT pin by setting INT1AE / INT2AE enable again, within a period when the alarm time matches real-time data. Figure 24 Alarm Interrupt Output Timing

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 25 5. Minute-periodical interrupt output 2 (only in the 1INT pin output mode) The output of minute-periodical interrupt 2 is the function to output "L", for 7.81 ms, from the 1INT pin, synchronizing with the first minute-carry processing after selecting the output mode. However, during a reading operation in the real-time data register, the procedure delays at 0.5 seconds max. thus output "L" from the 1INT pin also delays at 0.5 seconds max. During a writing operation in the real-time data register, some delay is made in the output period due to write timing and the second-data of writing. (1) During normal operation 7.81 ms 7.81 ms 7.81 ms 60 s 60 s INT1 pin Minute-carry processing Minute-carry processing Minute-carry processing (2) During reading operation in the real-time data register 7.81 ms 7.81 ms 7.81 ms INT1 pin Serial communication 0.5 s max. 60 s 60 s Real-time data read command Real-time data reading Real-time data read command Real-time data reading Minute-carry processing Minute-carry processing Minute-carry processing (Normal minute- carry processing) (3) During writing operation in the real-time data register 7.81 ms 7.81 ms 7.81 ms INT1 pin Real-time data write timing 55 s 80 s Minute-carry processing Minute-carry processing Minute-carry processing 45 s 10 s 30 s 50 s The output period is shorter. The output period is longer. Second data of writing: "50" s Second data of writing: "10" s Figure 29 Timing of Minute-periodical Interrupt Output 2

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 26 6. Operation of power-on detection circuit (only in the 1INT pin output mode) When power is applied to the S-35390A H Series, the power-on detection operates to set "1" in the POC flag (B0 in the status register 1). A 1 Hz clock pulse is output from the 1INT pin. OFF INT1FE

  • 32kE = 0, INT1AE = INT1ME = 0 Status register 2 setting INT1 pin 0.5 s 0.5 s Change by reset command Figure 30 Output Timing of 1INT Pin during Operation of Power-on Detection Circuit  Function of Clock Correction The function of clock correction is to correct advance / delay of the clock due to the deviation of oscillation frequency, in order to make a high precise clock. For correction, the S-35390A H Series adjusts the clock pulse by using a certain part of the dividing circuit, not adjusting the frequency of the crystal oscillator. Correction is performed once every 20 seconds (or 60 seconds). The minimum resolution is approx. 3 ppm (or approx. 1 ppm) and the S-35390A H Series corrects in the range of using the clock correction register. Regarding how to calculate the setting data, refer to "1. How to calculate" . When not using this function, be sure to set "00h". Table 14 Function of Clock Correction Item B0 = 0 B0 = 1 Correction Every 20 seconds Every 60 seconds Minimum resolution 3.052 ppm 1.017 ppm Correction range −195.3 ppm to +192.2 ppm −65.1 ppm to +64.1 ppm

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 27 1. How to calculate 1. 1 If current oscillation frequency > target frequency (in case the clock is fast) Correction value*1 = 128 − Integral value (Current oscillation frequency actual measurement value*2) (Minimum resolution*4) (Current oscillation frequency actual measurement value*2) (Target oscillation frequency*3) − Caution The figure range which can be corrected is that the calculated value is from 0 to 64. *1. Convert this value to be set in the clock correction register. For how to convert, refer to " (1) Calculation example 1". *2. Measurement value when 1 Hz clock pulse is output from the 1INT pin (or 2INT pin). *3. Target value of average frequency when the function of clock correction is used. *4. Refer to " Table 14 Function of Clock Correction ". (1) Calculation example 1 In case of current oscillation frequency actual measurement value = 1.000070 [Hz], target oscillation frequency = 1.000000 [Hz], B0 = 0 (Minimum resolution = 3.052 ppm) Correction value = 128 − Integral value   ()1.000070 − ()1.000000 = 128 − Integral value (22.93) = 128 − 22 = 106 Convert the correction value "106" to 7-bit binary and obtain "1101010b". Reverse the correction value "1101010b" and set it to B7 to B1 of the clock correction register. Thus, set the clock correction register: 1. 2 If current oscillation frequency < target frequency (in case the clock is slow) Correction value = Integral value (Current oscillation frequency actual measurement value) (Minimum resolution) (Current oscillation frequency actual measurement value) (Target oscillation frequency) − + 1 Caution The figure range which can be corrected is that the calculated value is from 0 to 62. (1) Calculation example 2 In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency = 1.000000 [Hz]. B0 = 0 (Minimum resolution = 3.052 ppm) Correction value = Integral value   ()1.000000 − ()0.999920 = Integral value (26.21) + 1 = 26 + 1 = 27 Thus, set the clock correction register: (2) Calculation example 3 In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency = 1.000000 [Hz], B0 = 1 (Minimum resolution = 1.017 ppm) Correction value = Integral value   ()1.000000 − ()0.999920 = Integral value (78.66) + 1 This calculated value exceeds the correctable range 0 to 62. B0 = "1" (minimum resolution = 1.017 ppm) indicates the correction is impossible.

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 28 2. Setting values for registers and correction values Table 15 Setting Values for Registers and Correct ion Values (Minimum Resolution: 3.052 ppm (B0 = 0)) B7 B6 B5 B4 B3 B2 B1 B0 Correction Value [ppm] Rate [s / day] 1 1 1 1 1 1 0 0 192.3 16.61 0 1 1 1 1 1 0 0 189.2 16.35 1 0 1 1 1 1 0 0 186.2 16.09 0 1 0 0 0 0 0 0 6.1 0.53 1 0 0 0 0 0 0 0 3.1 0.26 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 −3.1 −0.26 0 1 1 1 1 1 1 0 −6.1 −0.53 1 0 1 1 1 1 1 0 −9.2 −0.79 0 1 0 0 0 0 1 0 −189.2 −16.35 1 0 0 0 0 0 1 0 −192.3 −16.61 0 0 0 0 0 0 1 0 −195.3 −16.88 Table 16 Setting Values for Registers and Correct ion Values (Minimum Resolution: 1.017 ppm (B0 = 1)) B7 B6 B5 B4 B3 B2 B1 B0 Correction Value [ppm] Rate [s / day] 1 1 1 1 1 1 0 1 64.1 5.54 0 1 1 1 1 1 0 1 63.1 5.45 1 0 1 1 1 1 0 1 62.0 5.36 0 1 0 0 0 0 0 1 2.0 0.18 1 0 0 0 0 0 0 1 1.0 0.09 0 0 0 0 0 0 0 1 0 0 1 1 1 1 1 1 1 1 −1.0 −0.09 0 1 1 1 1 1 1 1 −2.0 −0.18 1 0 1 1 1 1 1 1 −3.0 −0.26 0 1 0 0 0 0 1 1 −63.1 −5.45 1 0 0 0 0 0 1 1 −64.1 −5.54 0 0 0 0 0 0 1 1 −65.1 −5.62

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 29 3. How to confirm setting value for register and result of correction The S-35390A H Series does not adjust the frequency of the crystal oscillation by using the function of clock correction. Therefore users cannot confirm if it is corrected or not by measuring output 32.768 kHz. When the function of clock correction is being used, the cycle of 1 Hz clock pulse output from the 1INT pin changes once in 20 times or 60 times, as shown in Figure 31. INT1 pin (1 Hz output) a a a a b In case of B0 = 0: a = 19 times, b = Once In case of B0 = 1: a = 59 times, b = Once 19 times or 59 times Once Figure 31 Confirmation of Clock Correction Measure a and b by using the frequency counter*1. Calculate the average frequency (Tave) based on the measurement results. B0 = 0, Tave = (a × 19 + b) ÷ 20 B0 = 1, Tave = (a × 59 + b) ÷ 60 Calculate the error of the clock based on the average frequency (Tave). The following shows an example for confirmation. Confirmation example: When B0 = 0, 66h is set Measurement results: a = 1.000080 Hz, b = 0.998493 Hz Clock Correction Register Setting Value Average Frequency [Hz] Per Day [s] Before correction 00 h (Tave = a) 1.000080 86393 After correction 66 h (Tave = (a × 19 + b) ÷ 20) 1.00000065 86399.9 Calculating the average frequency allows to confirm the result of correction. *1. Use a frequency counter with 7-digit or greater precision. Caution Measure the oscillation freq uency under the usage conditions.

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 36  Reset After Communication Interruption In case of communication interruption in the S-35390A H Series, for example, if the power supply voltage drops and only the master device is reset during communication, the S-35390A H Series does not perform the next operation because the internal circuit keeps the status prior to communication inte rruption. Since the S-35390A H Series does not have a reset pin, users usually reset its internal circuit by inputting a stop condition. However, if the SDA is outputting "L" (during output of acknowledgment signal or reading), the S-35390A H Series does not accept a stop condition from the master device. In this case, users are necessary to finish acknowledgment output or reading of the SDA. Figure 45 shows how to reset. First, input a start condition from the master device (the S-35390A H Series cannot detect a start condition because the SDA in the S-35390A H Series is outputting "L"). Next, input a clock pulse equivalent to 7-byte data access (63-clock) from the SCL. During this period, release the SDA line for the master device. By this procedure, SDA I/O before communication interruption is finished, and the SDA line in the S-35390A H Series is released. After that, inputting a stop condition resets the internal circuit and restores the regular communication . This reset procedure is recommended to be executed at initialization of the system after the master device's power supply voltage is raised. If this reset procedure is executed when the S-35390A H Series outputs an acknowledgment signal of a writing instruction, the writing operation may be performed at the corresponding register, so caution should be exercised. 1 2 62 63 89 Start condition Stop conditionClocks equivalent to 7-byte data access SCL "L" "L" or High-Z High-Z SDA (Master device output) SDA (S-35390A H Series output) SDA "L" or High-Z "L" Figure 45 How to Reset

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 40 2. Measurement of oscillation frequency When the S-35390A H Series is turned on, the internal power- on detector operates and a signal of 1 Hz is output from the 1INT pin to select the crystal oscillator and optimize the Cg value. Turn the power on and measure the signal with a frequency counter following the circuit configuration shown in Figure 51. If 1 Hz signal is not output, the power-on detector does not operate normally. Turn off the power and then turn it on again. For how to apply power, refer to " Power-on Detection Circuit and Register Status". Remark If the error range is ±1 ppm in relation to 1 Hz, the time is shifted by approximately 2.6 seconds per month (calculated using the following mode). 10–6 (1 ppm) × 60 seconds × 60 minutes × 24 hours × 30 days = 2.592 seconds INT1 INT2 SDA SCL S-35390A H Series VDD XOUT XIN VSS Cg 1 kΩ 10 kΩ 1 kΩ Frequency counter Open or pull-up Figure 51 Configuration of Oscillati on Frequency Measurement Circuit Caution 1. Use a high-accuracy freque ncy counter of 7 digits or more. 2. Measure the oscillation freq uency under the usage conditions. 3. Since the 1 Hz signal continues to be ou tput, initialization must be executed during normal operation.

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 41 3. Adjustment of oscillation frequency 3. 1 Adjustment by setting C g Matching of the crystal oscillator with the nominal frequency must be performed with the parasitic capacitance on the board included. Select a crystal oscillator and optimize the Cg value in accordance with the flowchart below. START END YES NO YES NO NO YES NO YES Set to center of variable capacitance*3 Select a crystal oscillator*1 Variable capacitance Change Cg Optimal value*2 FrequencyCg in specification Set Cg Make fine adjustment of frequency using variable capacitance Trimmer capacitor Fixed capacitor *1. Request a crystal manufacturer for a matching evaluation between the IC and the crystal oscillator. The recommended crystal characteristic value is CL value (load capacitance) = 6 pF. When using the IC and a crystal oscillator in the environment exceeding Ta = +85°C, it is recomme nded to ensure that the oscillation allowance is at least seven times at normal temperature. *2. The C g value must be selected on the actual PCB since it is affected by parasitic capacitance. Select the external Cg value in a range of 0 pF to 9.1 pF. *3. Adjust the rotation angle of the variable capacitance so that the capacitance value is slightly smaller than the center, and confirm the oscillation frequency and the center value of the variable capacitance. This is done in order to make the capacitance of the center value smaller than one half of the actual capacitance value because a smaller capacitance value increases the frequency variation. Figure 52 Crystal Oscillator Setting Flow Caution 1. The oscillation freque ncy varies depending on the ambi ent temperature and power supply voltage. Refer to " Characteristics (Typical Data)". 2. The 32.768 kHz crystal oscillato r operates more slowly at an ope rating temperature higher or lower than +20°C to +25°C. Therefore, it is recommended to set the oscillator to operate slightly faster at normal temperature.

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 42  Precautions

  • Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic protection circuit.
  • SII claims no responsibility for any disputes arising out of or in connection with any infringement by products including this IC of patents owned by a third party.

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK Rev.2.2_00 S-35390A H Series Seiko Instruments Inc. 43  Characteristics (Typical Data) 1. Standby current vs. V DD characteristics 2. Current consumption when 32 kHz is output vs. VDD characteristics Ta = +25°C, CL = 6 pF Ta = +25°C, CL = 6 pF 0 5 6 1.0 0.8 0.6 0.4 0.2 VDD [V] IDD1 [μA] 1 2 3 4 0 5 6 1.0 0.8 0.6 0.4 0.2 V DD [V] IDD3 [μA] 1 2 3 4 3. Current consumption during operation vs. Input clock characteristics 4. Standby current vs. Temperature characteristics Ta = +25°C, CL = 6 pF C L = 6 pF I DD2 [μA] 100 200 300 400 500 SCLfrequency [kHz] VDD = 5.0 V VDD = 3.0 V 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Ta [C] I DD1 [A] 25 0 25 50 75 10540 VDD = 5.0 V VDD = 3.0 V 5. Standby current vs. C g characteristics 6. Oscillation frequency vs. C g characteristics Ta = +25°C, CL = 6 pF Ta = +25°C, CL = 6 pF 0 6 8 10 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 IDD1 [μA] VDD = 5.0 V VDD = 3.0 V 2 4 Cg [pF] 100 –20 –40 –60 –80 –100 Δf/f [ppm] 2 4 6 Cg [pF] 8 10 VDD = 5.0 V VDD = 3.0 V

FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_00 Seiko Instruments Inc. 44 7. Oscillation frequency vs. V DD characteristics 8. Oscillation frequency vs. Temperature characteristics Ta = +25°C, Cg = 7.5 pF Cg = 7.5 pF –10 –20 –30 –40 –50 Δf/f [ppm] 5 6 VDD [V] 1 2 3 4 −50 −100 −150 −200 −250 Ta [°C] −25 0 25 50 75 105−40 Δf/f [ppm] VDD = 5.0 V VDD = 3.0 V 9. Oscillation start time vs. C g characteristics 10. Output current characteristics 1 (VOUT vs. IOL1) Ta = +25°C INT1 pin, INT2 pin, Ta = +25°C 500 450 400 350 300 250 200 150 100 t STA [ms] 2 8 104 6 Cg [pF] VDD = 5.0 V VDD = 3.0 V I OL1 [mA] 1 2 3 4 VOUT [V] VDD = 5.0 V VDD = 3.0 V 11. Output current characteristics 2 (V OUT vs. IOL2) 12. BLD detection, release voltage, V DDT (min.) vs. Temperature characteristics SDA pin, Ta = +25°C CL = 6 pF IOL2 [mA] 0.5 1 1.5 2 VOUT [V] 2.5 VDD = 5.0 V VDD = 3.0 V 1.4 Ta [°C] −25 0 25 50 75 105−40 1.2 1.0 0.8 0.6 0.4 0.2 VDD [V] Detection voltage Release voltage VDDT (min)

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