CBM1307

CBM1307 COREBAI | Alldatasheet

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www.corebai.com CBM1307 OPERATION INSTRUCTION

FEATURES

 Count of seconds, minutes, hours, week days, date, months and years with consideration of the leap years (before 2100);  56 bytes of the power self-sufficient RAM for the data storage;  Two-wire consecutive interface;  Programmable rectangular output signal;  Automatic determination of the supply voltage drop and the switching diagram;  Consumption of less than 500nА in the back-up supply mode with the operating generator;  Temperature range of the industrial application: -40℃ – +85℃  Accuracy is better than ±1 minute per month GENERAL DESCRIPTION CBM1307 is essentially the binary – decimal digital watch with a calendar, it has the additional 56 bytes of the power self-sufficient static RAM and possesses the low power consumption. The addresses and data are applied consecutively via the two-wire bi-directional bus. The microcircuit is intended for count of the real time in hours, minutes and seconds, count of week days, date, month and year. The last day of the month is automatically adjusted for the months of less, than 31 days, including correction for the leap year. The watches function in the 24-hour format or in the 12-hour format with the AM / PM-indicator. CBM1307 has the built-in power supply control circuit, which determines the supply disruption and automatically switches over the device into the battery mode. PIN DISCRIPTION Pin Symbol I/O Pin Description

1 X1 In Pin for connection of the quartz resonator

2 X2 In Pin for connection of the quartz resonator

3 VBAT In Pin for battery

4 GND In Ground pin

5 SDA Bi Input / output of serial data

6 SCL In Input of the consecutive cycle signal

7 SQW/OUT Out Output of rectangular signal

8 VCC In Power supply pin

A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION BLOCK DIAGRAM OPERATING TEMPERATURES RANGE Operating temperatures range of the microcircuit CBM1307: Т А = - 40 ... + 85℃. RECOMMENDED DC OPERATING CONDITION and ABSOLUTE MAXIMUM RATING Parameter Symbol Recommended Operating Condition Absolute Maximum Rating Unit min max min max Supply voltage VСС 4.5 5.5 -0.5 7.0 V Battery voltage VBAT 2.0 3.5 -0.5 7.0 V Low level input voltage VIL -0.3 0.8 -0.5 7.0 V High level input voltage VIH 2.2 VCC+0.3 -0.5 7.0 V Storage temperature TS - - -55 +125 ℃ * Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indi-cated under “recommended operating conditions” is not implied. A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS Parameter Symbol Mode Limit Unitmin max Input leakage current, (SCL only) ILI - 1 uА In / Out leakage current, (SDA and SQW/OUT) ILO - 1 uА Low level output voltage VOL 1) VСС = 4.5 V - 0.4 V Consumption current in the data transfer mode ICCA fSCL = 100 kHz - 1500 µА Consumption current in the static mode ICCS VСС = 5 V and SDA, SCL = 5 V - 200 µА Consumption current in the battery mode (SQW/OUT OFF., 32 kHz – ON) IBAT1 VCC = 0 V, VBAT = 3 V - 0.5 µA Consumption current in the battery mode (SQW/OUT – ON, 32 kHz – ON) IBAT2 VCC = 0 V, VBAT = 3 V - 0.8 µA Low level voltage is determined under the load current of 5mА; V OL = GND under the capacitance load AC ELECTRICAL CHARACTERISTICS Parameter Symbol Mode Limit Unit Min Max Cycle frequency SCL fSCL - 0 100 kHz Time of the bus vacant status between the statuses of STOP and START tBUF - 4.7 - µs Hold time (repeated) of START status tHD:STA 1) - 4.0 - µs Duration of the low status of the cycle pulse SCL tLOW - 4.7 - µs Duration of the cycle pulse high status SCL tHIGH - 4.0 - µs Pre-set time for the repeated status START tSU:STA - 4.7 - µs Data hold time tHD:DAT 2) - 0 - µs Data pre-set time tSU:DAT - 250 - ns Rise time of signals SDA and SCL tR - - 1000 ns Drop time of signals SDA and SCL tF - - 300 ns Pre-set time for the status STOP tSU:STO - 4.7 - ns TotaL capacitance load per each bus line CB - - 400 pF IN / OUT capacitance CI/O - 10 10 pF A ll data sheet.com

SCL) in order to overlap the indeterminancy area of the fall signal of SCL. status (tLOW) of signal SCL. Figure 9. Inverting Regulator Ground Referenced

www.corebai.com CBM1307 OPERATION INSTRUCTION TIMING CHART FUNCTIONING CBM1307 operates as the driven device on the serial bus. For access to it it is required to set the status START and to send after the register address the device identification code. It is possi-ble to address the next register consequently, until the status STOP is set. When V CC drops below 1.25 x V BAT, the access in progress to the device is ceased and the address counter is reset. At this time the device does not recognize the input data, excluding the erroneous information writing. When V CC drops below V BAT, the device switches over to the battery mode, consuming low power. When switching on the power supply V CC above VBAT + 0.2 V, the device switches over from the battery power supply to V CC; and recognizes the input data, when V CC becomes above 1.25 x V BAT. ADDRESSES CHART OF RTC AND RAM 00H SECONDS MINUTES HOURS DAY DATE MONTH YEAR 07H CONTROL 08H RAM 3FH 56×8 Addresses chart of the registers RTC and RAM is indicated in the Figure. Hour registers of the real time are positioned at the addresses 00h – 07h. RAM registers are positioned at the ad-dresses of 08h – 3Fh. In the mode of the multi-byte access, when reaching by the pointer of the address 3Fh, the end of the RAM address space, there happens transition to the register with the address 00h, beginning of the hours area. A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION OSCILLATOR CIRCUIT CBM1307 uses an external 32.768kHz crystal. The oscillator circuit does not require any exter-nal resistors or capacitors to operate. Table specifies several crystal parameters for the external crystal. CRYSTAL SPECIFICATIONS* Parameter Symbol Min Typ Max Unit Nominal Frequency fo 32.768 kHz Series Resistance ESR 45 kΩ Load Capacitance CL 12.5 pF *The crystal, traces, and crystal input pins should be isolated from RF generating signals. Application Note : Crystal Considerations for Real-Time Clocks for additional specifications. See 12 page. CLOCK ACCURACY The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional error will be added by crystal frequency drift caused by tempera-ture shifts. Externalcircuit noise coupled into the oscillator. OSCILLATOR CIRCUIT SHOWING INTERNAL BIAS NETWORK Figure shows a functional schematic of the oscillator circuit. If using a crystal with the specified A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION characteristics, the startup time is usually less than one second. RECOMMENDED LAYOUT FOR CRYSTAL HOURS AND CALENDAR Information on the time and date is obtained by means of reading the appropriate register bytes. Hour registers of the real time are indicated in the Figure. Pre-setting and time and calendar initialization are performed by means of writing the appropriate bytes. Information, contained in the time and calendar registers, represents the binary-decimal code. Bit 7 of register 0 represents the hour stop bit (CH). When this bit is set to “1”, the generator is off. When switching on the power supply, the initial status of all registers is not determined. It is necessary to enable the generator (bit CH = 0) when setting the initial configurations. CBM1307 operates in the 12-hour or in the 24-hour format. The bit 6 of the watch register de-termines the operational mode. 12-hour mode corresponds to the high level. In the 12-hour mode the bit 5 is the AM/PM bit. The high level corresponds to PM. In the 24-hour mode, the 5 is the second bit of tens of hours (20 -23 hours). During application of the signal “START” to the two-wire bus there happens transfer of the real time to the auxiliary set of registers. The time data are read from these auxiliary registers, while the watch proceeds in operation. This eliminates the necessity of repeated reading in case of updating the basic registers in the access process. A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION REGISTERS RTC CBM1307 CONTROL REGISTER Control register is used for control of pin SQW/OUT. BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 OUT X X SQWE X X RS1 RS0 OUT (output control): This bit presets the output logic level of the pin SQW/OUT, when the output of the rectangular signal is locked. SQWE (rectangular signal enabling): This bit, pre-set to the logic “1”, activates the generator output. Frequency of the output rectangular signal is determined by the bits RS0 and RS1. RS (frequency selection): These bits determine the frequency of the output rectangular signal, when the output of the rectangular signal is activated. The table indicates the frequencies, which can be selected by the bits RS. RS1 RS0 Frequency SQW/OUT 0 0 1 Hz 0 1 4,096 kHz 1 0 8,192 kHz 1 1 32,768 кГц A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION TWO-WIRE SERIAL DATA BUS CBM1307 supports the bi-directional two-wire bus and the protocol of the data exchange. The bus can be controlled by the “master” device, which generates the cycle signal (SCL), controls ac-cess to the bus, generates the statuses START and STOP . Typical configuration of the bus with the two-wire protocol is indicated in Figure. Data transfer can be initiated only when the bus is not occupied. In the process of the data transfer the data line should remain stable, while the line of the cycle signal is in the high status. Status alterations of the data line at that moment, when the cycle line is in the high status, will be regarded as the control signals. In compliance with this the following conditions are determined: Bus not occupied: both the data line and the cycle signal are in the HIGH status. Data transfer start: Status alteration of the data line during transition from HIGH to LOW, while the cycle line is in the HIGH status, is determined as the status START. Data transfer stop: Status alteration of the data line during transition from LOW to HIGH, while the cycle line is in the HIGH status, is determined as the status STOP . Valid data: Data line status complies with the valid data, when after the status START the data line is stable during the HIGH status of the cycle signal. Data on the line should be altered at the time of the LOW status of the cycle signal. One cycle pulse per one data bit. Each data transfer starts at the beginning of the status START and ceases at the beginning of the status STOP . Number of the data bytes, transferred between the statuses START and STOP is not limited and is determined by the «master» device. Information is transferred byte by byte, and each receipt is confirmed by the ninth byte. CBM1307 operates in the normal mode only (100 kHz). Confirmation of receipt: Each receiving device, when it being addressed, has to generate the recept confirmation after receiving each byte. «Master» device should generate the cycle pulses, which are allocated in compliance with the confirmation bits. If the receipt confirmation signal is in the high status, then on arrival of the confirmation cycle pulse, the device, confirming the receipt, should switch over the SDA line to the low status. Of course, there should be considered the pre-set time and the hold time. The «master» device should signalize on completion of the data transfer to the “slave” device, ceasing generation of the confirmation bit on receiving the receipt confirmation from the “slave” cycle pulse. In this case, the «slave one should switch over the data line to the low status, in order to enable the «master» one generate the condition of STOP . A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION DATA TRANSFER BY THE SERIAL TWO-WIRE BUS Depending on the status of bit , there are possible two types of transfer: 1. Data are transferred from the «master» transmitter to the «slave» receiver. The first byte, transmitted by the «master» one, is the address for the «slave» one. Then follows a sequence of the data bytes. The «slave» one returns the receipt confirmation bytes after each received byte. Order of the data transfer: the first is the most senior digit (MSB). 2. The data are transferred from the «slave» transmitter to the «master» receiver. The first byte (address of «slave») is applied to the «master». Then the «master» returns the confirmation bit. This follows after the transfer by the «slave» of the data sequence. The «master» returns the receipt confirmation bit after each received byte, with the exception of the last byte. After receipt of the last byte the receipt confirmation bit is not returned. The «master» device generates all cycle pulses and the statuses START and STOP . Transfer is completed at emergence of the status STOP or the repeated emergence of the status START. As the repeated status START is the beginning of the next serial transfer, the bus is not vacated.The data transfer order: the first is the most senior digit (MSB). A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION CBM1307 CAN OPERATE IN THE TWO FOLLOWING MODES 1. Mode of «slave» receiver (write mode of CBM1307): Serial data and cycles are received via SDA and SCL appropriately. After transfer of each byte the confirmation bit is sent. The statuses START and STOP are recognized as the beginning and the end of the serial transfer. The address recognition is performed by means of the hardware after receipt of the “slave” address and the direction bit. The address byte isthe first byte, received after occurrence of the START status, generated by the “master”. The address byte contains the seven address bits of CBM1307, equal to 1101000, accompanied by the direction bit ( ), which for write is equal to 0.After receipt and decoding of the address byte, DS1307 applies confirmation to the line SDA. After confirmation by CBM1307 of the “slave” address and the write bit, the «master» sends the register address of CBM1307. Thus the register indicator will be preset in CBM1307. Then the «smart» shall start to send each data byte with the subsequent receipt confirmation of each byte. Upon completion of writing the “master” shall formulate the status STOP for termination of the data transfer. Data Writing- Mode of << SLAVE>> Receiver Data Writing- mode of 《SLAVE》 Receiver A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION 2. Mode of《slave》Tranceiver (read-out mode from CBM1307): The first byte is received and processed as in the mode of the «slave» receiver. However, in this mode the direction bit will signify, that the transmission direction is changed. CBM1307 sends the se-rial data by SDA, the cycle pulses - by SCL. statuses START and STOP are understood as the be-ginning and end of the consecutive transmission. The address byte is the first byte, received after occurrence of the status START, generated by the «master». The address byte contains the seven bits of the address CBM1307, equal to 1101000, accompanied by the direction bit ( ), which is equal to 1 for reading. After receipt and decoding of the address byte CBM1307 receives confirmation from the line SDA. Then CBM1307 starts to send the data from the address, which is indicated by the register indicator. If the register indicator is not written prior to initialization of the read mode, then the first read address is the last address , retained in the register indicator. CBM1307 should send the bit of «non-confirmation», in order to complete the reading. Data Reading – Mode of 《SLAVE》 Transmitter Master reads after setting word address (write word address ; read data ) Data reading – mode of «slave» transmitter A ll data sheet.com

criteria, system design, and manu-facturing issue. crystal with the correct capacitive load. Figure 1. RTC oscillator with internal load capacitors and bias resistors.

Figure 4. Crystal load capacitors and equivalent parallel load. where VRMS is the RMS value of the voltage across the crystal. layout. High ESR and excessive capacitive loads are the major contributors to long startup times. Table 1. Crystal Specifications Note 1: Some devices allow higher ESR values, check the datasheet for specific requirements.

Table 2. Crystal Suppliers, cylinder-type (ESR=45kΩ) Note: Cylinder-type dimensions are barrel diameter and length, and exclude leads. Table 3. Crystal Suppliers, Surface Mount

www.corebai.com CBM1307 OPERATION INSTRUCTION POWER CONSUMPTION Many RTCs are designed to operate from a battery supply. In a typical application, a small lithium bat-tery can be used to run the oscillator and clock circuitry while the main supply is off. To maximize battery life, the oscillator must run using as little power as possible. To accomplish this, some design tradeoffs must be made. Negative Resistance For typical high-frequency oscillator circuits, it is normal for the circuit to be designed with a 5 or 10X margin for the ESR. Low-frequency crystals typically have higher ESRs. An RTC oscillator may have less than a 2X margin for negative resistance. An oscillator circuit with a low margin normally consumes less cur-rent. As a result, an RTC oscillator often is sensitive to relatively small amounts of stray leakage, noise, or an increase in ESR. The CL of the oscillator circuit influences the power consumption. An RTC with 12.5pF in-ternal loads consumes more power than one that has 6pF loads. However, the oscillator with 12.5pF load capacitors is usually less susceptible to noise. CRYSTAL LAYOUT GUIDELINES Since the crystal inputs of RTCs have very high impedance (about 109 ), the leads to the crystal act like very good antenna, coupling high-frequency signals from the rest of the system. If a signal is coupled onto the crystal pins, it can either cancel out or add pulses. Since most of the signals on a board are at a much higher frequency than the 32.768kHz crystal, it is more likely to add pulses where none are wanted. These noise pulses get counted as extra clock "ticks" and make the clock appear to run fast. The following steps illustrate how to determine if noise is causing the RTC to run fast: 1. Power the system up and synchronize the RTC to a known accurate clock. 2. Turn the system power off. 3. Wait for a period of time (two hours, 24 hours, etc.). The longer the time period, the easier it is to measure the accuracy of the clock. 4. Turn the system on again, read clock, and compare to the known accurate clock. 5. Resynchronize the RTC to the known accurate clock. 6. Keep the system powered up and wait for a period of time equal to the period in Step 3. 7. Read the clock after waiting for the above period of time and compare it to the known accurate clock. A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION By using the above steps, the accuracy of the clock can be determined both when the system is pow-ered up and when the system is powered down. If the clock proves to be inaccurate when the system is powered up, but is accurate when the system is powered down, the problem is most likely due to noise from other signals in the system. However, if the clock is inaccurate both when the system is powered up and when it is powered down, then the problem is not due to noise from the system. Since it is possible for noise to be coupled onto the crystal pins, care must be taken when placing the external crystal on a PC board layout. It is very important to follow a few basic layout guidelines concerning the placement of the crystal on the PC board layout to en-sure the extra clock ticks do not couple onto the crystal pins. 1. It is important to place the crystal as close as possible to the X1 and X2 pins. Keeping the trace lengths between the crystal and RTC as small as possible reduces the probability of noise coupling by reducing the length of the antenna. Keeping the trace lengths small also decreases the amount of stray capacitance. 2. Keep the crystal bond pads and trace width to the X1 and X2 pins as small as possible. The larger these bond pads and traces are, the more likely it is that noise can couple from adjacent signals. 3. If possible, place a guard ring (connected to ground) around the crystal. This helps isolate the crystal from noise coupled from adjacent signals. See Figure 2 for an illustration of using a guard ring around a crystal. 4. Try to ensure that no signals on other PC board layers run directly below the crystal or below the traces to the X1 and X2 pins. The more the crystal is isolated from other signals on the board, the less likely it is that noise is coupled into the crystal. There should be a minimum of 0.200 inches be-tween any digital signal and any trace connected to X1 or X2. The RTC should be isolated from any component that generates electromagnetic radiation (EMR). This is true for discrete and module type RTCs. 5. It may also be helpful to place a local ground plane on the PC board layer immediately below the crystal. This helps to isolate the crystal from noise coupling from signals on other PC board layers. Note that the ground plane needs to be in the vicinity of the crystal only and not on the entire board. See Figure 5 for an illustration of a local ground plane. Note that the perimeter of the ground plane does not need to be larger than the outer perimeter of the guard ring. A ll data sheet.com

plane is not sufficiently large enough to slow down the clock. Figure 5. Recommended layout for crystal. reduce the signal amplitude, and may cause erratic operation, such as varying amplitude. Oscillation should therefore be verified indirectly. then monitoring this bit will verify that the oscillator has started and is continuously running.

www.corebai.com CBM1307 OPERATION INSTRUCTION These methods won’t work if the designer is troubleshooting a design and cannot communicate with the RTC. An alternate method is to check the square wave output on RTCs that have a square wave output. Check the datasheet to verify if the RTC must be written first to enable the oscillator and square wave output. Note that most RTC square wave out-puts are open-drain, and require a pull up resistor for operation. The square wave output can also be used to verify the accuracy of the RTC, however, a frequency counter with sufficient accuracy must be used. Fast Clocks The following are the most common scenarios that cause a crystal-based RTC to run fast. 1. Noise coupling into the crystal from adjacent signals. This problem has been extensively covered above. Noise coupling usually causes an RTC to be grossly inaccurate. 2. Wrong crystal. An RTC typically runs fast if a crystal with a specified load capacitance (CL) greater than the RTC-specified load capacitance is used. The severity of the inaccuracy is dependent on the value of the CL. For example, using a crystal with a CL of 12pF on an RTC designed with a 6pF CL causes the RTC to be about 3 to 4 minutes per month fast. Slow Clocks The following are the most common scenarios that cause a crystal-based RTC to run slow. 1. Overshoots on RTC input pins. It is possible to cause a RTC to run slow by periodically stopping the oscillator. This can be inadvertently accomplished by noisy input signals to the RTC. If an input sig-nal rises to a voltage that is greater than a diode drop (~0.3V) above VDD, the ESD protection diode for the input pin will forward bias, allowing the substrate to be flooded with current. This, in turn, stops the oscillator until the input signal voltage decreases to below a diode drop above VDD. This mechanism can cause the oscillator to stop frequently if input signals are noisy. Therefore, care should be taken to ensure there is no overshoot on input signals. Another situation that is common to overshoot problem is having an input to the RTC at 5V when the RTC is in battery-backup mode. This can be a problem in systems that systematically shut down cer-tain circuits but keep others powered up. It is very important to ensure there are no input signals to the RTC that are greater than the battery voltage (unless stated otherwise in the device data sheet) when the device is in battery-backup mode. A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION 2. Wrong crystal. A RTC typically runs slow if a crystal with a specified CL is less than the CL of the RTC. The severity of the inaccuracy is dependent on the value of the CL. 3. Stray capacitance. Stray capacitance between the crystal pins and/or to ground can slow an RTC down. Therefore, care must be taken when designing the PC board layout to ensure the stray ca-pacitance is kept to a minimum. 4. Temperature. The further the operating temperature is from the crystal turnover temperature, the slower the crystal oscillates. See Figures 3 and 4. Clock Does Not Run The following are the most common scenarios that cause a RTC to not run. 1. The single most common problem when the clock does not run is that the CH (clock halt) or EOSC (enable oscillator) bit has not been set or cleared, as required. Many RTCs include a circuit that keeps the oscillator from running when power is first applied. This allows a system to wait for ship-ment to the customer, without drawing power from the backup battery. When the system is powered for the first time, the software/firmware must enable the oscillator and prompt the user for the correct time and date. 2. Surface mount crystals may have some N.C. (no connect) pins. Make sure that the correct pins from the crystal are connected to the X1 and X2 pins. CRYSTAL MANUFACTURING ISSUES Tuning fork crystals should not be exposed to ultrasonic cleaning. They are susceptible to damage from resonant vibration. Crystals should not be exposed to temperatures above their maximum ratings. Exposure to excessive temperatures may damage the crystal, and usually increase the ESR. Crystal "cans" should not be soldered to a PC board. This is sometimes done to ground the case of the crystal. Soldering directly to the case of the crystal usually subjects the unit to excessive temperatures. RTCs should generally be used in noncondensing environments. Moisture forming around the oscilla-tor conductors can cause leakage, which can cause the oscillator to stop. Conformal coatings can be used to protect the circuit, however, conformal coating may by itself cause problems. Some conformal coatings, especially epoxy-based materials, can have unacceptable levels of ionic contamination. In addition, conformal coatings can, if the PC board surface is not sufficiently cleaned prior to conformal coating, cause contaminants to concentrate around leads and traces. Solder flux residue can cause leakage between pins. RTC oscillator circuits are especially sensitive to leakage because of their low-power operation. Leakage between the oscillator input and A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION output, or leakage to ground, often keep the oscillator from running. A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION TYPICAL APPLICATION CIRCUIT A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION PACKAGE DIMENSION SOP8 Symbol Dimensions In Millimeters Dimensions Inches Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.270 BSC 0.050 BSC L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION PACKAGE/ORDERING INFORMATION MODEL ORDER NUMBER PACKAGE

DESCRIPTION

Reel,3000 1307AS CBM1307AD8 DIP-8 Tape and Reel,100 1307AD A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION 1. Test fixture overview In order to supply convenient method for RTC Test, COREBAI prepared test fixture. It’s controlled by Silabs MCU C8051F410, user can RTC test by using this fixture. 1.1. Installing the hardware CBM1363/CBM1307 is an IC compatible real time clock (RTC). As an application example, it demonstrates how to setup the RTC. This application note explain how to set the register value into a date and time value that can be put in the following form [YY]:[MM]:[DD]:[HH]:[MM]:[SS]. 1.2. Major Components Fig 1. Test board Schematic A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION Fig 2 Top view of test fixture A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION 2. Real Time Clock Program 2.1. Flow Chart Fig3. Flow Chart for CBM1363 A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION Fig4. Flow Chart for CBM1307 A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION 2.2. Register Set Up for CBM1363 2.2.1. Initialization Register Setting Up It is necessary to enable the generation (bit TEST1 = 0) when setting the initial configurations... Register Ad-dress Register Name Initialize Write Data Contents 0x00H Control/Status 1 0x00 TEST1 bit = 0 (normal mode) STOP bit = 0 (RTC source clock) TESTC bit = 0 (normal op) 0x01H Control/Status 2 0x00 AIE bit = 0 (Alarm int disabled) TIE bit = 0 (Timer int disabled) 0x0DH CLKPUT control 0x0EH Timer Control 0x0FH Timer

2.2.2 Timer Register Setting Up

Register Ad-dress Register Name Initialize Write Data Contents 0x02H Seconds 0x02 0x03H Minutes 0x03 0x04H Hours 0x14 0x05H Dates 0x23 0x06H Day of week Sunday=0,Monday=1,Tuesday=2, Wednesday=3,..., Saturday=6 0x07H Century/month 0x07 Bit7 ‘C’ of the months/century register indicates century for year 19xx (bit7=1), and year 20xx (bit7=0). 0x08H Year 0x12 0x09H Minute alarm 0x0AH Hour alarm 0x0BH Date alarm 0x0CH Weekday alarm For example, we want to set the date for 23 July 2012, current time to 12:03:02, and then we need to call. 1. Seconds setup : rtc_write ( SECONDS, 0x02); 2. Minutes setup : rtc_write ( MINUTES, 0x03); 3. Hours setup : rtc_write ( HOURS,0x14); 4. Dates setup : rtc_write ( DATES, 0x23); 5. Month setup : rtc_write ( MONTH, 0x07); 6. Year setup : rtc_write ( YEAR, 0x12) A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION

2.3 Register Set Up for CBM1307

2.3.1. Initialization Register Setting Up It is necessary to enable the generation (bit CH = 0) when setting the initial configurations.. Register Ad-dress Register Name Initialize Write Data Contents 0x00H.Bit8 Control/Status 1 0x00 CH bit = 0 (normal mode)

2.3.2 Timer Register Setting Up

Register Ad-dress Register Name Initialize Write Data Contents 0x00H Seconds 0x05 0x01H Minutes 0x10 0x02H Hours 0x13 0x03H Day 0x05 Range 1-7 0x04H Date 0x15 0x05H Month 0x06 0x06H Year 0x12 0x07H Control For example, we want to set the date for 23 June 2012, current time to 13:10:05, and then we need to call. 1. Seconds setup : rtc_write( 0x00, 0x05); 2. Minutes setup : rtc_write( 0x01, 0x10); 3. Hours setup : rtc_write( 0x02, 0x13); 4. Day setup : rtc_write( 0x03, 0x05); 5. Dates setup : rtc_write( 0x04, 0x15); 6. Month setup : rtc_write( 0x05, 0x06); 7. Year setup : rtc_write (0x06 , 0x12); A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION

2.4 Hyper Terminal Configuration

1. Bits per second : 9600 BPS 2. Data bit : 8 bit 3. Parity bit : None 4. Stop bits : 1 bit 5. Flow Control : None Fig5. Example test program for CBM1363 Run the Serial terminal and make sure the baud rate is set correctly at 9600bps Fig6. CBM1363 RTC Data on Serial Terminal A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION Fig7. CBM1307 RTC Data on Serial Terminal A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION 3. Example Source for RTC This documentation shows an example of a main function to setup and read/write data. If you request example source code, we can provide source codes. 3.1. Read Current Time from CBM1363 & CBM1307 Slave Address of CBM1363 = 0xA2 Slave Address of CBM1307 = 0xD0; 3.2. Write Set Time for CBM1363 & CBM1307 A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION 3.3. I2C Example Source for CBM1363 & CBM1307 #ifdef CBM1363 sbit SCL = P1^7; sbit SDA = P1^6; // #endif #ifdef CBM1307 sbit SDA = P0^2; sbit SCL = P0^1; #endif void i2c_start(void) // START condition SDA = HIGH; DelayTimeLoop(); SCL = HIGH; DelayTimeLoop(); SDA = LOW; DelayTimeLoop(); SCL = LOW; DelayTimeLoop(); void i2c_stop(void) // STOP condition SCL = HIGH; DelayTimeLoop(); SDA = HIGH; DelayTimeLoop(); /* Clock pulse generation. The function returns data or acknowledgment bit */ unsigned char i2c_clock(void)//bit i2c_clock(void) bit level; // state of SDA line SCL = 1; DelayTimeLoop(); while (!SCL); // if a pulse was stretched DelayTimeLoop(); level = SDA; DelayTimeLoop(); SCL = 0; return (level); /* Writing a byte to a slave, with most significant bit first. The function returns acknowledgment bit.*/ unsigned char i2c_write(unsigned char byte) unsigned char mask = 0x80; unsigned char aaa; while (mask) { if (byte & mask) A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION SDA = 1; else SDA = 0; i2c_clock(); mask >>= 1; aaa = i2c_clock(); return (aaa); /* Reading byte from a slave, with most significant bit first. The parameter indicates, whether to acknowledge (1) or not (0) */ unsigned char i2c_read(unsigned char acknowledgment) uchar mask = 0x80, byte = 0x00; while (mask) { if (i2c_clock()) byte |= mask; mask >>= 1; /* next bit to receive */ if (acknowledgment) { SDA = 0; i2c_clock(); SDA = 1; else { SDA = 1; i2c_clock(); return (byte); unsigned char rtc_read_7_byte(unsigned char addr) unsigned char status , i; i2c_start(); if (!i2c_write(0xA2 )){//0xA2 is Slave Address for CBM1363, 0xD2 is for CBM1307 DelayTimeLoop(); if (!i2c_write(addr)){ i2c_start(); if (!i2c_write(0xA2 | 0x01)){ CBM1307’s slave address is 0xD2 for(i=0;i<6;i++){ Receive_Data[i] = i2c_read(1); Receive_Data[6] = i2c_read(0); else { status = 1; else{ A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION status = 1; else status = 1; i2c_stop(); return(status); A ll data sheet.com

www.corebai.com CBM1307 OPERATION INSTRUCTION 4. Test Procedure for RTC 4.1. Test Procedure for CBM1363 1. Make sure that test fixture is power off. 2. Place CBM1363 on CBM1363_SOCKET of test fixture. 3. Connect the Battery on CBM1363_BAT. 4. Run the Serial terminal and make sure the baud rate is set correctly at 9600bps 5. After turning on the power of test fixture, identify whether Green LED of Status Indicator is flickering. If that’s flickering every 1S, it indicates CBM1363 working . Method for the program is refer to the Chapter 2. 6. Data is displayed in Serial Terminal window like to Fig6. refer to Fig6 7. And then test fixture is power off. 8. Wait for a period of time ( two hours, 10 minutes, etc .). 9. Turn the test fixture on again, and check the time. the amount time as power off is passed . 4.2. Test Procedure for CBM1307 1. Make sure that test fixture is power off. 2. Place CBM1363 on CBM1307_SOCKET of test fixture. 3. Connect the Battery on CBM1307_BAT. 4. Run the Serial terminal and make sure the baud rate is set correctly at 9600bps 5. After turning on the power of test fixture, identify whether Green LED of Status Indicator is flickering. If that’s flickering every 1S, it indicates CBM1307 working . Method for the program is refer to the Chapter 2. 6. Data is displayed in Serial Terminal window like to Fig7. refer to Fig7 7. And then test fixture is power off. 8. Wait for a period of time ( two hours, 10 minutes, etc .). 9. Turn the test fixture on again, and check the time. the amount time as power off is passed . A ll data sheet.com