Si7050/1/3/4/5-A20 I 2 C TEMPERATURE S ENSORS Features High Accuracy Temperature Sensors Si7051: ±0.1 °C (max) ±0.3 °C (max) Si7054: ±0.4 °C (max) Si7055: ±0.5 °C (max) Si7050: ±1.0 °C (max) Si7053: Accuracy maintained over the entire operating temperature and voltage range Low Power Consumption 195 nA average current @ 1 Hz sample rate 14-bit resolution Wide operating voltage Factory calibrated (1.9 to 3.6 V) 2 I C interface –40 to +125 °C operating range 3x3 mm DFN package Ordering Information: See page 19. Applications HVAC/R Thermostats White goods Computer equipment Portable consumer devices Asset tracking Cold chain storage Battery protection Industrial controls Medical equipment Pin Assignments Top View Description The Si705x Digital Temperature Sensors offer industry-leading low power consumption and high accuracy across the entire operating voltage and temperature range. These monolithic CMOS ICs feature a band-gap temperature sensor element, an analog-to-digital converter with up to 14bit resolution, signal processing, calibration data, and an I2C interface. The patented use of novel signal processing and analog design enables the sensors to maintain their accuracy over a wide temperature and voltage range, while consuming very little current. SDA 1 6 SCL GND 2 5 VDD DNC 3 4 DNC Patent Protected. Patents pending The temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no recalibration or software changes required. The Si705x devices are available in a 3x3 mm DFN package, and the industry-standard I2C interface can operate at up to 400 kHz. Requiring just 195 nA of average current when sampled once per second, the Si705x can operate for several years with just a single coin cell battery. The Si705x devices offer an accurate, low-power, factory-calibrated digital solution ideal for measuring temperature in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms. Rev. 1.13 3/16 Copyright © 2016 by Silicon Laboratories Si7050/1/3/4/5-A20 Si7050/1/3/4/5-A20 Functional Block Diagram Vdd Si705x Temp Sensor Voltage Regulator ADC Control Logic 1.25V Ref I2C Interface GND 2 Calibration Memory Rev. 1.13 SDA SCL Si7050/1/3/4/5-A20 TABLE O F C ONTENTS Section Page 1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Typical Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5. I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.1. Issuing a Measurement Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.2. Reading and Writing User Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.3. Electronic Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 5.4. Firmware Revision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6. Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 6.1. Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7. Pin Descriptions: Si705x (Top View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 9. Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9.1. Package Outline: 3x3 6-Pin DFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 10. PCB Land Pattern and Solder Mask Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 11. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 11.1. Si705x Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 11.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 11.3. Si7055-A20-ZM (Matte Tin Finish Lead Frame) Top Marking . . . . . . . . . . . . . . . . . 23 11.4. Si7055-A20-ZM (Matte Tin Finish Lead Frame) Top Marking Explanation . . . . . . . 23 12. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Rev. 1.13 3 Si7050/1/3/4/5-A20 1. Electrical Specifications Unless otherwise specified, all min/max specifications apply over the recommended operating conditions. Table 1. Recommended Operating Conditions Symbol Parameter Power Supply Operating Temperature Test Condition Min Typ Max Unit VDD 1.9 — 3.6 V TA –40 — +125 °C Table 2. General Specifications 1.9 < VDD < 3.6 V; TA = –40 to 125 °C default conversion time unless otherwise noted. Parameter Symbol Test Condition Min Typ Max Unit Input Voltage High VIH SCL, SDA pins 0.7 x VDD — — V Input Voltage Low VIL SCL, SDA pins — — 0.3 x VDD V Input Voltage Range VIN SCL, SDA pins with respect to GND 0.0 — VDD V Input Leakage IIL SCL, SDA pins — — 1 μA VOL SDA pin; IOL = 2.5 mA; VDD = 3.3 V — — 0.6 V SDA pin; IOL = 1.2 mA; VDD = 1.9 V — — 0.4 V Temperature conversion in progress — 90 120 μA — 0.06 0.62 μA — 0.06 3.8 μA — 3.5 4.0 mA Peak IDD during I2C operations3 — 3.5 4.0 mA 14-bit temperature — 7 10.8 ms 13-bit temperature — 4 6.2 ms 12-bit temperature — 2.4 3.8 ms 11-bit temperature — 1.5 2.4 ms From VDD ≥ 1.9 V to ready for a conversion, 25 °C — 18 25 From VDD ≥ 1.9 V to ready for a conversion, full temperature range — — 80 After issuing a software reset command — 5 15 Output Voltage Low Current Consumption IDD Standby, –40 to +85 °C1 Standby, –40 to +125 °C 1 Peak IDD during powerup Conversion Time Powerup Time tCONV tPU 2 ms Notes: 1. No conversion or I2C transaction in progress. Typical values measured at 25 °C. 2. Occurs once during powerup. Duration is <5 msec. 3. Occurs during I2C commands for Reset, Read/Write User Registers, Read EID, and Read Firmware Version. Duration is <100 µs when I2C clock speed is >100 kHz (>200 kHz for 2-byte commands). 4 Rev. 1.13 Si7050/1/3/4/5-A20 Table 3. I2C Interface Specifications1 1.9 VDD 3.6 V; TA = –40 to +125 °C unless otherwise noted. Parameter Symbol Test Condition Min Typ Max Unit Hysteresis VHYS High-to-low versus low-tohigh transition 0.05 x VDD — — V SCLK Frequency2 fSCL — — 400 kHz SCL High Time tSKH 0.6 — — µs SCL Low Time tSKL 1.3 — — µs Start Hold Time tSTH 0.6 — — µs Start Setup Time tSTS 0.6 — — µs Stop Setup Time tSPS 0.6 — — µs Bus Free Time tBUF 1.3 — — µs SDA Setup Time tDS 100 — — ns SDA Hold Time tDH 100 — — ns SDA Valid Time tVD;DAT From SCL low to data valid — — 0.9 µs tVD;ACK From SCL low to data valid — — 0.9 µs 50 — — ns SDA Acknowledge Valid Time Suppressed Pulse Width3 Between Stop and Start tSPS Notes: 1. All values are referenced to VIL and/or VIH. 2. Depending on the conversion command, the Si705x may hold the master during the conversion (clock stretch). At above 100 kHz SCL, the Si705x may also hold the master briefly for user register and device ID transactions. At the highest I2C speed of 400 kHz the stretching will be <10 µs. 3. Pulses up to and including 50 ns will be suppressed. Rev. 1.13 5 Si7050/1/3/4/5-A20 tSKH 1/fSCL tSKL tSP SCL tBUF tSTH tDS D6 SDA D5 tDH D4 D0 tSPS R/W ACK Start Bit Stop Bit tVD : ACK tSTS Figure 1. I2C Interface Timing Diagram 6 Rev. 1.13 Si7050/1/3/4/5-A20 Table 4. Temperature Sensor 1.9 ≤ VDD ≤ 3.6 V; TA = –40 to +125 °C default conversion time unless otherwise noted. Parameter Symbol Test Condition Operating Range Accuracy 1 Repeatability/Noise Min Typ Max Unit –40 — +125 °C 2 Si7051 — — ±0.1 Si7053 — ±0.2 ±0.3 °C Si7054 — ±0.3 ±0.4 °C Si7055 — ±0.4 ±0.5 °C Si7050 — ±0.5 ±1.0 °C 14-bit resolution — 0.01 — 13-bit resolution — 0.02 — 12-bit resolution — 0.04 — 11-bit resolution — 0.08 — Unmounted device — 0.7 — s Si705x-EB board — 5.1 — s — 0.01 — °C °C RMS Response Time3 τ63% Long Term Stability °C/Yr Notes: 1. 14b measurement resolution (default). Values apply to the full operating temperature and voltage range of the device. 2. ±0.1 °C: +35.8 °C to 41 °C; ±0.13 °C: 20.0 °C to 70.0 °C; ±0.25 °C: –40 °C to +125 °C. 3. Time to reach 63% of final value in response to a step change in temperature. Actual response time will vary dependent on system thermal mass and air-flow. Rev. 1.13 7 Si7050/1/3/4/5-A20 Table 5. Thermal Characteristics Parameter Symbol Test Condition DFN-6 Unit Junction to Air Thermal Resistance JA JEDEC 2-Layer board, No Airflow 256 °C/W Junction to Air Thermal Resistance JA JEDEC 2-Layer board, 1 m/s Airflow 224 °C/W Junction to Air Thermal Resistance JA JEDEC 2-Layer board, 2.5 m/s Airflow 205 °C/W Junction to Case Thermal Resistance JC JEDEC 2-Layer board 22 °C/W Junction to Board Thermal Resistance JB JEDEC 2-Layer board 134 °C/W Table 6. Absolute Maximum Ratings1 Parameter Min Typ Max Unit Ambient temperature under bias –55 — 125 °C Storage Temperature2 –65 — 150 °C Voltage on I/O pins –0.3 — VDD+0.3 V V Voltage on VDD with respect to GND –0.3 4.2 V ESD Tolerance Symbol Test Condition HBM — — 2 kV CDM — — 1.25 kV MM — — 250 V Notes: 1. Absolute maximum ratings are stress ratings only, operation at or beyond these conditions is not implied and may shorten the life of the device or alter its performance. 2. Special handling considerations apply; see application note, “AN607: Si70xx Humidity and Temperature Sensor Designer’s Guide”. 8 Rev. 1.13 Si7050/1/3/4/5-A20 2. Typical Application Circuits Figure 2 demonstrates the typical application circuit for Si705x sensors. 1.9 to 3.6 V 0.1 µF 10 k 10 k 5 VDD Si705x SCL 6 SDA 1 SCL SDA GND 2 Figure 2. Typical Application Circuit for Temperature Measurement Rev. 1.13 9 Si7050/1/3/4/5-A20 3. Bill of Materials Table 7. Typical Application Circuit BOM for Temperature Measurement 10 Reference Description Mfr Part Number Manufacturer R1 Resistor, 10 k, ±5%, 1/16 W, 0603 CR0603-16W-103JT Venkel R2 Resistor, 10 k, ±5%, 1/16 W, 0603 CR0603-16W-103JT Venkel C1 Capacitor, 0.1 µF, 16 V, X7R, 0603 C0603X7R160-104M Venkel U1 IC, Digital Temperature Sensor Si705x-A20-IM Silicon Labs Rev. 1.13 Si7050/1/3/4/5-A20 4. Functional Description Vdd Si705x Temp Sensor Voltage Regulator Calibration Memory ADC Control Logic 1.25V Ref I2C Interface SDA SCL GND Figure 3. Si705x Block Diagram The Si705x Digital Temperature Sensors offer industry-leading low power consumption and high accuracy across the entire operating voltage and temperature range. These monolithic CMOS ICs feature a band-gap temperature sensor element, an analog-to-digital converter with up to 14-bit resolution, signal processing, calibration data, and an I2C interface. The patented use of novel signal processing and analog design enables the sensors to maintain their accuracy over a wide temperature and voltage range, while consuming very little current. The temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no recalibration or software changes required. The Si705x devices are available in a 3x3 mm DFN package, and the industry-standard I2C interface can operate at up to 400 kHz. Requiring just 195nA of average current when sampled once per second, the Si705x can operate for several years with just a single coin cell battery. The Si705x devices offer an accurate, low-power, factory-calibrated digital solution ideal for measuring temperature in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms. Rev. 1.13 11 Si7050/1/3/4/5-A20 5. I2C Interface The Si705x communicates with the host controller over a digital I2C interface. The 7-bit base slave address is 0x40. When sending commands to the device, the R/W bit is set high for a read command and low for a write command. Table 8. I2C Slave Address Byte A6 A5 A4 A3 A2 A1 A0 R/W 1 0 0 0 0 0 0 0 Master I2C devices communicate with the Si705x using a command structure. The commands are listed in the I2C command table. Commands other than those documented below are undefined and should not be sent to the device. When sending commands to the device, the R/W bit is set high for a read command and low for a write command. Table 9. I2C Command Table Command Description Command Code Measure Temperature, Hold Master Mode 0xE3 Measure Temperature, No Hold Master Mode 0xF3 Reset 0xFE Write User Register 1 0xE6 Read User Register 1 0xE7 Read Electronic ID 1st Byte 0xFA 0x0F Read Electronic ID 2nd Byte 0xFC 0xC9 Read Firmware Revision 0x84 0xB8 12 Rev. 1.13 Si7050/1/3/4/5-A20 5.1. Issuing a Measurement Command The measurement command instructs the Si705x to perform a temperature measurement. While the measurement is in progress, the option of either clock stretching (Hold Master Mode) or Not Acknowledging read requests (No Hold Master Mode) is available to indicate to the master that the measurement is in progress; the chosen command code determines which mode is used. Optionally, a checksum byte can be returned from the slave for use in checking for transmission errors. The checksum byte will follow the least significant measurement byte if it is acknowledged by the master. The checksum byte is not returned if the master “not acknowledges” the least significant measurement byte. The checksum byte is calculated using a CRC generator polynomial of x8 + x5 + x4 + 1, with an initialization of 0x00. The checksum byte is optional after initiating a temperature measurement with commands 0xE3, and 0xF3. The checksum byte is required for reading the electronic ID with commands 0xFA 0x0F and 0xFC 0xC9. For all other commands, the checksum byte is not supported. Table 10. I2C Bit Descriptions Name Symbol Description START S SDA goes low while SCL high STOP P SDA goes high while SCL high Repeated START Sr SDA goes low while SCL high. It is allowable to generate a STOP before the repeated start. SDA can transition to high before or after SCL goes high in preparation for generating the START. READ R Read bit = 0 WRITE W Write bit = 1 All other bits — SDA value must remain high or low during the entire time SCL is high (this is the set up and hold time in Figure 1) In the I2C sequence diagrams in the following sections, bits produced by the master and slave are color coded as shown: Master Slave Sequencetoperformameasurementandreadbackresult(HoldMasterMode) S Slave Address W A Measure Cmd A Sr Slave Address R A Clockstretch during measurement MSByte A LSByte NA P A Checksum Rev. 1.13 NA P 13 Si7050/1/3/4/5-A20 Sequencetoperformameasurementandreadbackresult(NoHoldMasterMode) S Slave Address R A W A Measure Cmd Slave Address A Sr R NA Slave Address R NA Slave Address MSByte A LSByte NA P A Checksum NA P 5.1.1. Measuring Temperature The measure temperature commands 0xE3 and 0xF3 will perform a temperature measurement and return the measurement value. The results of the temperature measurement may be converted to temperature in degrees Celsius (°C) using the following expression: 175.72 Temp_Code- – 46.85 Temperature (C = ------------------------------------------------------65536 Where: Temperature (°C) is the measured temperature value in °C Temp_Code is the 16-bit word returned by the Si705x A temperature measurement will always return XXXXXX00 in the LSB field. 5.2. Reading and Writing User Registers There is one user register on the Si705x that allows the user to set the configuration of the Si705x. The procedure for accessing that register is described below. The checksum byte is not supported after reading a user register. Sequence to read a register Slave S Address W A Read Reg Cmd A Sr Slave Address R A Read Data NA P Sequence to write a register S 14 Slave Address W A Write Reg Cmd Rev. 1.13 A Write Data A P Si7050/1/3/4/5-A20 5.3. Electronic Serial Number The Si705x provides a serial number individualized for each device that can be read via the I2C serial interface. Two I2C commands are required to access the device memory and retrieve the complete serial number. The command sequence, and format of the serial number response is described in the figure below: Master Slave First access: S Slave Address W ACK 0xFA ACK 0X0F ACK S Slave Address R ACK SNA_3 ACK CRC ACK SNA_2 ACK CRC ACK SNA_1 ACK CRC ACK SNA_0 ACK CRC NACK S Slave Address W ACK 0xFC ACK 0XC9 ACK S Slave Address R ACK SNB_3 ACK SNB_2 ACK CRC ACK SNB_1 ACK SNB_0 ACK CRC NACK P 2nd access: P The format of the complete serial number is 64-bits in length, divided into 8 data bytes. The complete serial number sequence is shown below: SNA_3 SNA_2 SNA_1 SNA_0 SNB_3 SNB_2 SNB_1 SNB_0 The SNB3 field contains the device identification to distinguish between the different Silicon Labs devices. The value of this field maps to the following devices according to this table: 0x00 or 0xFF engineering samples 50 = 0x32 = Si7050 51 = 0x33 = Si7051 53 = 0x35 = Si7053 54 = 0x36 = Si7054 55 = 0x37 = Si7055 Rev. 1.13 15 Si7050/1/3/4/5-A20 5.4. Firmware Revision The internal firmware revision can be read with the following I2C transaction: S Slave Address W A 0x84 R A A FWREV The values in this field are encoded as follows: 0xFF = Firmware version 1.0 0x20 = Firmware version 2.0 16 Rev. 1.13 0xB8 A NA A P S Slave Address Si7050/1/3/4/5-A20 6. Control Registers Table 11. Register Summary Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 User Register 1 RES1 VDDS RSVD RSVD RSVD RSVD RSVD RES0 Notes: 1. Any register not listed here is reserved and must not be written. The result of a read operation on these bits is undefined. 2. Except where noted, reserved register bits will always read back as “1,” and are not affected by write operations. For future compatibility, it is recommended that prior to a write operation, registers should be read. Then the values read from the RSVD bits should be written back unchanged during the write operation. 6.1. Register Descriptions Register 1. User Register 1 Bit D7 D6 D5 D4 D3 D2 D1 D0 Name RES1 VDDS RSVD RSVD RSVD RSVD RSVD RES0 Type R/W R R/W R/W R/W R/W R/W Reset Settings = 0011_1010 Bit Name D7; D0 RES[1:0] D6 VDDS Function Measurement Resolution: 00: 01: 10: 11: 14 bit 12 bit 13 bit 11 bit VDD Status: 0: 1: VDD OK VDD Low The minimum recommended operating voltage is 1.9 V. A transition of the VDD status bit from 0 to 1 indicates that VDD is between 1.8 V and 1.9 V. If the VDD drops below 1.8 V, the device will no longer operate correctly. D5, D4, D3, D2, D1 RSVD Reserved Rev. 1.13 17 Si7050/1/3/4/5-A20 7. Pin Descriptions: Si705x (Top View) SDA 1 6 SCL GND 2 5 VDD DNC 3 4 DNC Pin Name Pin # SDA 1 I2C data GND 2 Ground. This pin is connected to ground on the circuit board through a trace. Do not connect directly to GND plane. VDD 5 Power. This pin is connected to power on the circuit board. SCL 6 I2C clock DNC 3,4 TGND Paddle 18 Pin Description These pins should be soldered to pads on the PCB for mechanical stability; they can be electrically floating or tied to VDD (do not tie to GND). This pad is connected to GND internally. This pad is the main thermal input to the onchip temperature sensor. The paddle should be soldered to a floating pad. Rev. 1.13 Si7050/1/3/4/5-A20 8. Ordering Guide Table 12. Device Ordering Guide Part Number Description Max. Accuracy Pkg Packing Format Si7050-A20-IM Digital temperature sensor ±1 °C DFN 6 Tube Si7050-A20-IMR Digital temperature sensor ±1 °C DFN 6 Tape and Reel Si7051-A20-IM Digital temperature sensor ±0.1 °C DFN 6 Tube Si7051-A20-IMR Digital temperature sensor ±0.1 °C DFN 6 Tape and Reel Si7053-A20-IM Digital temperature sensor ±0.3 °C DFN 6 Tube Si7053-A20-IMR Digital temperature sensor ±0.3 °C DFN 6 Tape and Reel Si7054-A20-IM Digital temperature sensor ±0.4 °C DFN 6 Tube Si7054-A20-IMR Digital temperature sensor ±0.4 °C DFN 6 Tape and Reel Si7055-A20-IM Digital temperature sensor ±0.5 °C DFN 6 Tube Si7055-A20-IMR Digital temperature sensor ±0.5 °C DFN 6 Tape and Reel Si7055-A20-ZM Digital temperature sensor – Matte tin finish lead frame ±0.5 °C DFN 6 Tube Si7055-A20-ZMR Digital temperature sensor – Matte tin finish lead frame ±0.5 °C DFN 6 Tape and Reel Note: The “A” denotes product revision A and “20” denotes firmware version 2.0. Rev. 1.13 19 Si7050/1/3/4/5-A20 9. Package Outline 9.1. Package Outline: 3x3 6-Pin DFN Figure 10. 3x3 6-pin DFN Table 13. Package Diagram Dimensions Dimension Min Nom Max A 0.70 0.75 0.80 A1 0.00 0.02 0.05 b 0.35 0.40 0.45 D D2 3.00 BSC. 1.40 1.50 e 1.00 BSC. E 3.00 BSC. 1.60 E2 2.30 2.40 2.50 L 0.35 0.40 0.45 aaa 0.10 bbb 0.10 ccc 0.05 ddd 0.10 eee 0.05 Notes: 1. All dimensions shown are in millimeters (mm). 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 20 Rev. 1.13 Si7050/1/3/4/5-A20 10. PCB Land Pattern and Solder Mask Design Figure 4. Si705x PCB Land Pattern Table 14. PCB Land Pattern Dimensions Symbol mm C1 2.90 E 1.00 P1 1.60 P2 2.50 X1 0.45 Y1 0.85 Notes: General 1. All dimensions shown are at Maximum Material Condition (MMC). Least Material Condition (LMC) is calculated based on a Fabrication Allowance of 0.05 mm. 2. This Land Pattern Design is based on the IPC-7351 guidelines. Solder Mask Design 3. All metal pads are to be non-solder mask defined (NSMD). Clearance between the solder mask and the metal pad is to be 60 µm minimum, all the way around the pad. Stencil Design 4. A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should be used to assure good solder paste release. 5. The stencil thickness should be 0.125 mm (5 mils). 6. The ratio of stencil aperture to land pad size should be 1:1 for all perimeter pins. 7. A 2x1 array of 1.00 mm square openings on 1.30 mm pitch should be used for the center ground pad to achieve a target solder coverage of 50%. Card Assembly 8. A No-Clean, Type-3 solder paste is recommended. 9. The recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components. Rev. 1.13 21 Si7050/1/3/4/5-A20 11. Top Marking 11.1. Si705x Top Marking 11.2. Top Marking Explanation Mark Method: Laser Pin 1 Mark: Circle = 0.30 mm Diameter (UpperLeft Corner) Font Size: 0.05 mm Line 1 Mark Format: Device Code Si705 Line 2 Mark Format: TTTT Manufacturing Code from the Assembly Purchase Order form. Line 3 Mark Format: YY = Year WW = Work Week Assigned by the Assembly House. Corresponds to the year and work week of the assembly release. 22 Rev. 1.13 Si7050/1/3/4/5-A20 11.3. Si7055-A20-ZM (Matte Tin Finish Lead Frame) Top Marking 11.4. Si7055-A20-ZM (Matte Tin Finish Lead Frame) Top Marking Explanation Mark Method: Laser Pin 1 Mark: Circle = 0.30 mm Diameter (UpperLeft Corner) Font Size: 0.05 mm Line 1 Mark Format: Device Code Si7055 Line 2 Mark Format: TTTT Manufacturing Code from the Assembly Purchase Order form. Line 3 Mark Format: YY = Year WW = Work Week Assigned by the Assembly House. Corresponds to the year and work week of the assembly release. Rev. 1.13 23 Si7050/1/3/4/5-A20 12. Additional Reference Resources AN607: 24 Si70xx Humidity and Temperature Sensor Designer’s Guide Rev. 1.13 Si7050/1/3/4/5-A20 DOCUMENT CHANGE LIST Revision 0.9 to Revision 1.0 Updated Section "5. I2C Interface" on page 12 Updated Table 12, “Device Ordering Guide,” on page 19 Revision 1.0 to Revision 1.1 Added part number Si7051 Updated "9. Package Outline" on page 20 Revision 1.1 to Revision 1.11 Added new OPN: Si7055-A20-ZM with matte tin finish lead frame Revision 1.11 to Revision 1.12 Removed erroneous typical value for Si7051 accuracy from Table 4. Revision 1.12 to Revision 1.13 Removed “YM0” and “YM0R” automotive qualified part numbers from Table 12, “Device Ordering Guide,” on page 19. Rev. 1.13 25 Smart. Connected. Energy-Friendly. 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