SC628A SEMTECH | Alldatasheet

Document overview

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Technical content

Features

Input supply voltage range — 3.0V to 5.5V Charge pump modes — 1x, 1.5x and 2x Flash LED — 1000mA max in fl ash mode, 275mA max continuous for spotlight Charge pump frequency — 250kHz I 2C compatible interface — up to 400kHz External fl ash control pin to sync with camera One second fl ash time out with disable feature Automatic sleep mode (fl ash off ) — IQ = 100μA Low shutdown current — 0.1μA (typical) Ultra-thin package — 3mm x 3mm x 0.6mm Fully WEEE and RoHS compliant

Applications

Description

The SC628A is a high effi ciency charge pump LED driver using Semtech’s proprietary charge pump technology. Performance is optimized for use in single-cell Li-ion battery applications. The load and supply conditions determine whether the charge pump operates in 1x, 1.5x, or 2x mode. The charge pump provides continuous spotlight mode current or pulsed fl ash mode current to an LED using a dedicated current sink. In fl ash mode, a fl ash-timeout feature turns off the fl ash if active for longer than 1 second. In spotlight mode, the timeout feature is disabled to allow continuous operation of the LED. The SC628A uses an I 2C compatible serial interface to set the fl ash mode or the spotlight mode current. The fl ash/ spotlight output is triggered via either the I2C interface or a dedicated fl ash enable pin (FLEN). In sleep mode, the device reduces quiescent current to 100μA while continuing to monitor the serial interface. Total current reduces to 0.1μA in shutdown. SC628A IN SDA FLEN AGND PGND OUT FL CIN 4.7μF 1C+ C 1 - C 2 + C 2 - I2C Data Flash Control Enable Control I2C Clock SCL EN VBAT = 3.0V to 5.5V 2.2μF 2.2μF COUT 4.7μF FLASH US Patents: 6,504,422; 6,794,926 Typical Application Circuit July 14, 2009

Ordering Information

SC628AULTRT(1)(2) MLPQ-UT-20 3×3 SC628AEVB Evaluation Board Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free package only. Device is WEEE and RoHS compliant. TOP VIEW T C2- NC PGND FL 6789 1 0 SCL SDA NC EN NC NC15 1617181920 NC FLEN AGND NC NC OUT IN C1- C2+ C1+ 628A yyww xxxx MLPQ-UT-20; 3x3, 20 LEAD θJA = 40°C/W yyww = Date Code xxxx = Semtech Lot No.

Exceeding the above specifi cations may result in permanent damage to the devic e or device malfunction. Operation outside of the parameters specifi ed in the Electrical Characteristics section is not recommended. NOTES: (1) Tested according to JEDEC standard JESD22-A114-B. (2) Calculated from package in still air, mounted to 3” x 4.5” , 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. Absolute Maximum Ratings OUT + 0.3) Recommended Operating Conditions Thermal Information Thermal Resistance, Junction to Ambient(2) (°C/W) . . . . 40 Unless otherwise noted, TA = +25°C for Typ, -40ºC to +85°C for Min and Max, TJ(MAX) = 125ºC, VIN = 3.0V to 4.2V, CIN = COUT = 4.7μF (ESR = 0.03Ω), C1 = C2 = 2.2μF (ESR = 0.03Ω), size code 0603 (1608 metric) for all capacitors Parameter Symbol Conditions Min Typ Max Units Supply Specifi cations Shutdown Current I Q(OFF) Shutdown, VIN = 4.2V 0.1 2 μA Total Quiescent Current I Q Sleep, EN = VIN 100 160 μA Charge pump in 1x mode 3.8 4.65 mACharge pump in 1.5x mode 4.6 5.85 Charge pump in 2x mode 4.6 5.85 Fault Protection Output Short Circuit Current Limit IOUT(SC) OUT pin shorted to GND 450 mA Over-Temperature T OTP 160 °C Flash Mode Safety Timer(1) tFL(MAX) Flash sink active 0.75 1.00 1.25 s Charge Pump Over-Voltage Protection VOVP OUT pin open circuit, VOUT = VOVP rising threshold 5.3 5.7 6.0 V

Electrical Characteristics

Parameter Symbol Conditions Min Typ Max Units Fault Protection (continued) Undervoltage Lockout VUVLO Increasing VIN 2.7 V VUVLO-HYS Hysteresis 800 mV Charge Pump Electrical Specifi cations Maximum Total Output Current IOUT(MAX) VIN > 3.5V, VOUT(MAX) = 4.0V 1000 mA Flash Current Settling Time t FL_SET maximum time for current to settle 1 ms Flash Current Setting I FL Nominal setting for FL 25 1000 mA Flash Current Accuracy I FL_ACC VIN = 3.7V, IFL = 450mA, TA = 25°C -13 ± 5 13 % 1x Mode to 1.5x Mode Falling Transition Voltage VTRANS1x IOUT = 150mA, VOUT = 3.3V 3.37 V 1.5x Mode to 2x Mode Falling Transition Voltage VTRANS1.5x IOUT = 150mA, VOUT = 4.5V(2) 3.3 V Current Sink Off -State Leakage Current IBLn VIN = VFL = 4.2V 0.1 1 μA Pump Frequency f PUMP VIN = 3.2V 250 kHz Digital I/O Electrical Specifi cations (FLEN, EN) Input High Threshold V IH VIN = 5.5V 1.4 V Input Low Threshold V IL VIN = 3.0V 0.4 V Input High Current I IH VIN = 5.5V -1 +1 μA Input Low Current I IL VIN = 5.5V -1 +1 μA I2C Interface Interface complies with slave mode I2C interface as described by Philips I2C specifi cation version 2.1 dated January, 2000. Digital Input Voltage VB-IL 0.4 V VB-IH 1.4 V SDA Output Low Level I DIN (SDA) ≤ 3mA 0.4 V Digital Input Current I B-IN -0.2 0.2 μA Hysteresis of Schmitt Trigger Inputs VHYS 0.1 V Maximum Glitch Pulse Rejection tSP 50 ns I/O Pin Capacitance C IN 10 pF Electrical Characteristics (continued)

Electrical Characteristics (continued) Parameter Symbol Conditions Min Typ Max Units I2C Timing Clock Frequency f SCL 400 440 kHz SCL Low Period(3) tLOW 1.3 μs SCL High Period(3) tHIGH 0.6 μs Data Hold Time(3) tHD_DAT 0μ s Data Setup Time(3) tSU_DAT 250 ns Setup Time for Repeated START Condition(3) tSU_STA 0.6 μs Hold Time for Repeated START Condition(3) tHD_STA 0.6 μs Setup Time for STOP Condition(3) tSU_STO 0.6 μs Bus-Free Time Between STOP and START(3) tBUF 1.3 μs Interface Start-up Time(3) tEN Bus Start-up Time After EN Pin is Pulled High 1 ms Notes: (1) Once tripped, fl ash output will remain disabled until FLEN pin is cycled or reset via serial interface. (2) Test voltage is V OUT = 4.5V — a relatively extreme LED voltage — to force a transition during test. Typically V OUT = 3.3V for the white LED at 100mA. (3) Guaranteed by design

Spotlight Current — 25mA VIN (V) IFL (mA) VOUT = 2.97V, IOUT = 25mA, TA = 25°C Flash Current — 400mA Flash Current — 875mA Spotlight Current — 100mA Spotlight Current — 275mA Flash Current — 1000mA 340 360 380 400 420 440 460 VIN (V) IFL (mA) VOUT = 3.41V, IOUT = 400mA, TA = 25°C 100 105 110 115 VIN (V) IFL (mA) VOUT = 3.14V, IOUT = 100mA, TA = 25°C 200 225 250 275 300 325 350 VIN (V) IFL (mA) VOUT = 3.32V, IOUT = 275mA, TA = 25°C VOUT = 3.69V, IOUT = 875mA, TA = 25°C IFL (mA) VIN (V) 575 675 775 875 975 1075 1175 VOUT = 3.72V, IOUT = 1000mA, TA = 25°C IFL (mA) VIN (V) 700 800 900 1000 1100 1200 1300

Typical Characteristics (continued) Spotlight Effi ciency — 25mA Spotlight Effi ciency — 100mA VOUT = 2.97V, IOUT = 25mA, TA = 25°C % Efficiency VIN (V) 100 VOUT = 3.14V, IOUT = 100mA, TA = 25°C % Efficiency VIN (V) 100 Spotlight Effi ciency — 275mA VOUT = 3.32V, IOUT = 275mA, TA = 25°C % Efficiency VIN (V) 100 Flash Effi ciency — 400mA VIN (V) VOUT = 3.41V, IOUT = 400mA, TA = 25°C % Efficiency 100

Spotlight Mode Ripple — 1x Mode Time (4.0μs/div) VIN (100mVAC/div) IOUT = 275mA, TA = 25°C, Spotlight Mode VOUT (100mVAC/div) IOUT (200mADC/div) 0mA— Spotlight Mode Ripple — 1.5x Mode Time (4.0μs/div) VIN (100mVAC/div) IOUT = 275mA, TA = 25°C, Spotlight Mode VOUT (100mVAC/div) IOUT (200mADC/div) 0mA— Flash Mode Ripple — 1x Mode Time (4.0μs/div) VIN (200mVAC/div) IOUT = 1000mA, TA = 25°C, Flash Mode VOUT (200mVAC/div) IOUT (500mADC/div) 0mA— Flash Mode Ripple — 1.5x Mode Time (4.0μs/div) VIN (200mVAC/div) IOUT = 1000mA, TA = 25°C, Flash Mode VOUT (200mVAC/div) IOUT (500mADC/div) 0mA— Flash Current Pulse Time (40ms/div) VFLEN (2VDC/div) VIN = 3.7V, IOUT = 1000mA, TA = 25°C, tON = 100ms VOUT (2VDC/div) IOUT (500mADC/div) 0mA— Flash Mode Ripple — 2x Mode Time (4.0μs/div) VIN (200mVAC/div) IOUT = 1000mA, TA = 25°C, Flash Mode VOUT (200mVAC/div) IOUT (500mADC/div) 0mA— 0V— 0V— Typical Characteristics (continued)

Time (200ms/div) VFLEN (2VDC/div) VIN = 4.2V, IOUT = 1000mA, TA = 25°C VOUT (2VDC/div) IOUT (500mADC/div) 0mA— Output Open Circuit Protection Time (200ms/div) VFLEN (2VDC/div) VIN = 3.7V, TA = 25°C VOUT (2VDC/div) IOUT (500mADC/div) 0mA— Output Short Circuit Current Limit Time (200ms/div) VFLEN (2VDC/div) VIN = 3.7V, VOUT = 0V, TA = 25°C VOUT (2VAC/div) IOUT (500mADC/div) 0mA— 0V— 0V— 0V— 0V— 0V— 0V— Typical Characteristics (continued)

Pin # Pin Name Pin Function 1 C2- Negative connection to bucket capacitor 2 — requires a 2.2μF capacitor connected to C2+

2 PGND Ground pin for high current charge pump and Flash LED driver

3 FL Current sink output for fl ash LED(s)

— do not terminate 5N C Unused pin — do not terminate 6N C Unused pin — do not terminate 7N C Unused pin — do not terminate

8 AGND Analog ground pin — connect to ground and separate from PGND current

9 SCL I 2C clock input pin

10 FLEN Control pin for fl ash LED(s) — high = ON, low = OFF

11 SDA I2C bi-directional data pin — used for read and write operations for all internal registers (refer to Register Map and I2C Interface sections)

12 EN Chip enable — active high — low state resets all registers (see register map table)

13 NC Unused pin — do not terminate

14 NC Unused pin — do not terminate

15 NC Unused pin — do not terminate

16 OUT Charge pump output — all LED anode pins should be connected to this pin — requires a 4.7μF capacitor to PGND 17 C2+ Positive connection to bucket capacitor 2 — requires a 2.2μF capacitor connected to C2- 18 C1+ Positive connection to bucket capacitor 1 — requires a 2.2μF capacitor connected to C1- 19 IN Battery voltage input — connect with a 4.7μF capacitor to PGND 20 C1- Negative connection to bucket capacitor 1 — requires a 2.2μF capacitor connected to C1+ T THERMAL PAD Thermal pad for heatsinking purposes — connect to ground plane using multiple vias — not connected internally

(1x, 1.5x, 2x) 20 17 1 C1+ C1- C2+ C2- OUT16 NC NC NC NC FL IN EN FLEN PGND 13NC SCL SDA 8AGND 15 NC 14 NC Bandgap Reference

This design is optimized for handheld applications supplied from a single Li-Ion cell and includes the following key features: A high effi ciency fractional charge pump that supplies power to the fl ash LED An LED fl ash output that provides up to 1000mA of momentary current or up to 275mA of continuous spotlight current An I 2C compatible interface that provides control of all device functions High Current Fractional Charge Pump The fl ash output is supported by a high effi ciency, high current fractional charge pump output at the OUT pin. The charge pump multiplies the input voltage by 1, 1.5, or 2 times. The charge pump switches at a fi xed frequency of 250kHz in 1.5x and 2x modes and is disabled in 1x mode to save power and improve effi ciency. The mode selection circuit automatically selects the 1x, 1.5x or 2x mode based on circuit conditions. Circuit conditions such as low input voltage, high output current, or high LED voltage place a higher demand on the charge pump output. A higher numerical mode may be needed momentarily to maintain regulation at the OUT pin during intervals of high demand, such as the high current of an LED fl ash or the droop at the IN pin during a supply voltage transient. The charge pump responds to these momentary high demands, setting the charge pump to the optimum mode (1x, 1.5x or 2x), as needed to deliver the output voltage and load current while optimizing effi ciency. Hysteresis is provided to prevent mode toggling. The charge pump requires two bucket capacitors for low ripple operation. One capacitor must be connected between the C1+ and C1- pins and the other must be connected between the C2+ and C2- pins as shown in the typical application circuit diagram. These capacitors should be equal in value, with a minimum capacitance of 2.2μF to support the charge pump current requirements. The device also requires a 4.7μF capacitor on the IN pin and a 4.7μF capacitor on the OUT pin to minimize noise and support the output drive requirements. Capacitor case size is an important factor in the performance of the SC628A. Due to the poor DC coeffi cient of the 0402 size (1005 metric), 0603 size (1608 metric) capacitors are strongly recommended to achieve the rated electrical specifi cations and performance shown in the typical characteristics section. Capacitors with X7R or X5R ceramic dielectric are strongly recommended for their low ESR and superior temperature and voltage characteristics. Y5V capacitors should not be used as their temperature coeffi cients make them unsuitable for this application. LED Flash and Spotlight Current Sink A single output current sink is provided to drive both fl ash and spotlight functions. In fl ash mode, this current sink provides up to 1000mA for a fl ash LED or array of parallel LEDs . Flash current settings are available in 21 values from 300mA to 1000mA. Flash steps increments are no larger than 75mA nominally. Some additional settings that have smaller increments of 50mA, 25mA and 12.5mA. Table 1 on page 12 contains detailed current setting information for fl ash mode. The FLEN pin directly triggers the FLASH function when pulled high, or it can be wired to IN to enable software control via the serial interface. In spotlight mode, the output can be set for up to 275mA of continuous current. Settings are available in 25mA increments from 25mA to 275mA, with some additional settings that have smaller increments of 12.5mA. Table 2 on page 13 contains detailed current setting information for spotlight mode. Continuous operation above 275mA is not recommended due to high power dissipation. Flash and Spotlight Safety Timer A safety timer disables the fl ash and spotlight output current sink if the sink remains active for an extended period. The timer protects the SC628A and the LED from high power dissipation that can cause overheating. The Applications Information

Applications Information (continued) timer’s default state is on, but the timer may be disabled via the serial interface to allow continuous output current in spotlight mode. The safety timer aff ects only the FL pin and will turn off the sink after a period of 1 second. The timer may be reset by either forcing the FLEN pin low or by resetting the Flash/Spotlight control bits via the interface. Shutdown State The device is disabled when the EN pin is low. All registers are reset to default condition when EN is low. Sleep Mode When the LED is off , sleep mode is activated. This is a reduced current mode that helps minimize overall current consumption by turning off the clock and the charge pump while continuing to monitor the serial interface for commands. I2C Compatible Interface Functions All device functions can be controlled via the I 2C compatible interface. The interface is described in detail in the Serial I nterface section of the datasheet. Protection Features The SC628A provides several protection features to safeguard the device from catastrophic failures. These features include: Output Open Circuit Protection Over-Temperature Protection Charge Pump Output Current Limit LED Float Detection Output Open Circuit Protection Over-Voltage Protection (OVP) is provided at the OUT pin to prevent the charge pump from producing an excessively high output voltage. In the event of an open circuit at OUT, the charge pump runs in open loop and the voltage rises up to the OVP limit. OVP operation is hysteretic, meaning the charge pump will momentarily turn off until V OUT is suffi ciently reduced. The maximum OVP threshold is 6.0V, allowing the use of a ceramic output capacitor rated at 6.3V with no fear of over-voltage damage. Over-Temperature Protection The Over-Temperature (OT) protection circuit helps prevent the device from overheating and experiencing a catastrophic failure. When the junction temperature exceeds 160 °C, the device goes into thermal shutdown with all outputs disabled until the junction temperature is reduced. All register information is retained during thermal shutdown. Charge Pump Output Current Limit The device also limits the charge pump current at the OUT pin. When OUT is shorted to ground, the typical output current is 400mA. The current limiting is triggered by an output under-voltage lockout below 2V. The output returns to normal when the short is removed and OUT is above 2.5V. Above 2.5V, a minimum current limit of 1000mA applies. LED Float Detection Float detect is a fault detection feature of the LED current sink output. If the output is programmed to be enabled and an open circuit fault occurs on the current sink, the resulting open loop will cause the output voltage to change to the default condition V OUT = 3.0V. The output will remain 3.0V until the loop is once again completed by an LED or the output is re-programmed to the off state.

Address D7 D6 D5 D4 D3 D2 D1 D0 Reset Value Description 0x02 Flash/Spotlight Bits 0 (1) FLTO Flash/Spotlight Bits 0x10 Flash/Spotlight Control Notes: (1) Always write a 0 to this bit Register and Bit Defi nitions Flash/Spotlight Control Register (0x02) This register is used to select the fl ash or spotlight current and to confi gure the fl ash time-out feature. Bits D7, D6, D3, D2, D1, D0 The value of bits D7, D6, D3, D2, D1, and D0 are used to set the current for the fl ash and spotlight modes. Flash current values are set in accordance with Table 1 on page 12, and spotlight current values are set in accordance with Table 2 on page 13. FL TO This bit is used to enable the fl ash safety time-out feature. The default state is enabled with FLTO = 1. If this bit is set, the device will turn off the fl ash after a nominal period of 1s. Two ways to re-enable the fl ash function after a safety time-out are: Pull the FLEN pin low to reset the fl ash function Clear and re-write bits D7, D6 D3, D2, D1, and D0.

Register and Bit Defi nitions (continued) Table 1 — Flash Current Codes(1) Data Bits for Register 02h Flash Current 8 Bit Word D7 D6 D5 D4 D3 D2 D1 D0 I FL (mA) Hex x(2) x(2) 0(3) 1(4) 0000 O F F 0 0 h 01 0 (3) 1(4) 1011 3 0 0 5 B h 01 0 (3) 1(4) 1101 3 2 5 5 D h 11 0 (3) 1(4) 0101 337.5 D5h 00 0 (3) 1(4) 1110 3 5 0 1 E h 10 0 (3) 1(4) 1010 3 7 5 9 A h 00 0 (3) 1(4) 0011 4 0 0 1 3 h 11 0 (3) 1(4) 1001 412.5 D9h 00 0 (3) 1(4) 0101 4 5 0 1 5 h 11 0 (3) 1(4) 1101 487.5 DDh 00 0 (3) 1(4) 0111 5 0 0 1 7 h 11 0 (3) 1(4) 1111 5 2 5 D F h 00 0 (3) 1(4) 1001 5 5 0 1 9 h 00 0 (3) 1(4) 1011 6 0 0 1 B h 00 0 (3) 1(4) 1101 6 5 0 1 D h 10 0 (3) 1(4) 0101 6 7 5 9 5 h 00 0 (3) 1(4) 1111 7 0 0 1 F h 10 0 (3) 1(4) 0111 7 5 0 9 7 h 10 0 (3) 1(4) 1001 8 2 5 9 9 h 10 0 (3) 1(4) 1011 8 7 5 9 B h 10 0 (3) 1(4) 1101 9 5 0 9 D h 10 0 (3) 1(4) 1111 1000 9Fh Notes: (1) Use only the data values shown in Table 1 for fl ash function. (2) Either 1 or 0. (3) Always write a 0 to this bit. (4) Write a 1 to set the FLTO bit for fl ash mode.

Register and Bit Defi nitions (continued) Table 2 — Spotlight Current Codes(1) Data Bits for Register 02h Spotlight Current 8 Bit Word D7 D6 D5 D4 D3 D2 D1 D0 I FL (mA) Hex x(2) x(2) 0(3) 0(4) 0000 O F F 0 0 h 01 0 (3) 0(4) 0010 2 5 4 2 h 11 0 (3) 0(4) 0010 37.5 C2h 00 0 (3) 0(4) 0010 5 0 0 2 h 01 0 (3) 0(4) 0110 7 5 4 6 h 00 0 (3) 0(4) 0100 1 0 0 0 4 h 11 0 (3) 0(4) 0110 112.5 C6h 01 0 (3) 0(4) 1010 1 2 5 4 A h 00 0 (3) 0(4) 0110 1 5 0 0 6 h 01 0 (3) 0(4) 1110 1 7 5 4 E h 11 0 (3) 0(4) 1010 187.5 CAh 00 0 (3) 0(4) 1000 2 0 0 0 8 h 01 0 (3) 0(4) 0101 2 2 5 4 5 h 01 0 (3) 0(4) 0111 2 5 0 4 7 h 11 0 (3) 0(4) 1110 262.5 CEh 01 0 (3) 0(4) 1001 2 7 5 4 9 h Notes: (1) Use only the data values shown in Table 2 for spotlight function. (2) Either 1 or 0. (3) Always write a 0 to this bit. (4) Write a 0 to reset the FLTO bit for spotlight mode.

The I2C General Specifi cation The SC628A is a read-write slave-mode I 2C device and complies with the Philips I 2C standard Version 2.1, dated January 2000. The SC628A has four user-accessible internal 8-bit registers. The I 2C interface has been designed for program fl exibility, supporting direct format for write operation. Read operations are supported on both combined format and stop separated format. While there is no auto increment/decrement capability in the SC628A I 2C logic, a tight software loop can be designed to randomly access the next register independent of which register you begin accessing. The start and stop commands frame the data-packet and the repeat start condition is allowed if necessary. SC628A Limitations to the I2C Specifi cations The SC628A only recognizes seven bit addressing. This means that ten bit addressing and CBUS communication are not compatible. The device can operate in either standard mode (100kbit/s) or fast mode (400kbit/s). Slave Address Assignment The seven bit slave address is 0110 111x. The eighth bit is the data direction bit. 0x6E is used for a write operation, and 0x6F is used for a read operation. Supported Formats The supported formats are described in the following subsections. Direct Format — Write The simplest format for an I 2C write is direct format. After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC628A I 2C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the appropriate 8 bit data byte. Once again the slave acknowledges and the master terminates the transfer with the stop condition [P]. Combined Format — Read After the start condition [S], the slave address is sent, followed by an eighth bit indicating a write. The SC628A I 2C then acknowledges that it is being addressed, and the master responds with an 8 bit data byte consisting of the register address. The slave acknowledges and the master sends the repeated start condition [Sr]. Once again, the slave address is sent, followed by an eighth bit indicating a read. The slave responds with an acknowledge and the previously addressed 8 bit data byte; the master then sends a non-acknowledge (NACK). Finally, the master terminates the transfer with the stop condition [P]. Stop Separated Reads Stop-separated reads can also be used. This format allows a master to set up the register address pointer for a read and return to that slave at a later time to read the data. In this format the slave address followed by a write command are sent after a start [S] condition. The SC628A then acknowledges it is being addressed, and the master responds with the 8-bit register address. The master sends a stop or restart condition and may then address another slave. After performing other tasks, the master can send a start or restart condition to the SC628A with a read command. The device acknowledges this request and returns the data from the register location that had previously been set up. Serial Interface

Serial Interface (continued) I2C Direct Format Write Slave Address Register Address DataSW A A A P S – Start Condition W – Write = ‘0’ A – Acknowledge (sent by slave) P – Stop condition Slave Address – 7-bit Register address – 8-bit Data – 8-bit I2C Stop Separated Format Read Slave Address Register Address Slave Address B Data NACKS W A A S/Sr R A P P Slave AddressS Register Address Setup Access Master Addresses other Slaves Register Read Access S – Start Condition W – Write = ‘0’ R – Read = ‘1’ A – Acknowledge (sent by slave) NAK – Non-Acknowledge (sent by master) Sr – Repeated Start condition P – Stop condition Slave Address – 7-bit Register address – 8-bit Data – 8-bitI2C Combined Format Read Slave Address Register Address Slave Address Data NACKS WA A Sr R A P S – Start Condition W – Write = ‘0’ R – Read = ‘1’ A – Acknowledge (sent by slave) NAK – Non-Acknowledge (sent by master) Sr – Repeated Start condition P – Stop condition Slave Address – 7-bit Register address – 8-bit Data – 8-bit

e N PIN 1 INDICATOR (LASER MARK) A C SEATING PLANE E/2 D/2 LxN bxN COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS .2. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).1. INCHES DIMENSIONS NOM e bbb aaa DIM N L E MIN D A MILLIMETERS MAXMINMAX NOM E BD NOTES: bbb C A B aaa C .003 .061 .067 .000 .020 (.006) 0.08 .071 1.55 .024 .002 0.00 0.50 1.801.70 0.05 0.60 (0.1524) .004 0.10 1.55 2.90 1.70 1.80 3.00 3.10 0.40 BSC.016 BSC .122.118.114 .071.067.061 A DAP is 1.90 x 190mm.3. Outline Drawing — MLPQ-UT-20 3x3

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Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com Contact Information SC628A Land Pattern — MLPQ-UT-20 3x3 THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. NOTES: C Z R Y X G P H .146 .004 .008 .031 .083 .067 .016 3.70 0.20 0.80 0.10 1.70 0.40 2.10 DIM (2.90) MILLIMETERS DIMENSIONS (.114) INCHES CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). K .067 1.70 THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. FUNCTIONAL PERFORMANCE OF THE DEVICE. FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR H K R (C) X P Y G Z