SI7005USB-EVB

Si7005 D IGITA L I 2 C H UMIDITY AND TEMPERATURE S ENSOR D DNC DNC DNC GND 20 19 GND 1 18 DNC DNC 2 17 DNC SCL 3 16 DNC DNC 13 DNC 12 14 DNC 6 11 15 CS 5 DNC 4 GND SDA DNC om The Si7005 is a digital relative humidity and temperature sensor. This monolithic CMOS IC integrates temperature and humidity sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I2C host interface. The patented use of industry-standard, low-K polymeric dielectrics for sensing humidity enables the construction of a low-power, monolithic CMOS sensor IC with low drift and hysteresis and excellent long term stability. 21 Pin Assignments Micro-environments/data centers  Automotive climate control and de-fogging  Asset and goods tracking  m en de d Description Patent protected; patents pending 10 Industrial HVAC/R  Thermostats/humidistats  Respiratory therapy  White goods  See Ordering Guide. fo r Applications Ordering Information CEXT during reflow liquids and particulates (hydrophobic/oleophobic) Excludes DNC Protection 22 Low-profile 9 µA during RH conversion  VDD 240  DNC 0 to 100% RH operating range  –40 to +85 °C (GM) or 0 to +70 °C operating range (FM)  Wide operating voltage range (2.1 to 3.6 V)  Low Power Consumption  23 ºC accuracy (typical)  ±1 ºC accuracy (maximum @ 0 to 70 °C) 24  ±0.5 8  7 4.5% RH (maximum @ 0–80% RH) Temperature Sensor I2C host interface Integrated on-chip heater 4x4 mm QFN package Excellent long term stability Factory calibrated Optional factory-installed cover DNC ±   GND Relative Humidity Sensor N ew  es ig n Features ec Both the temperature and humidity 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. N ot R The Si7005 is packaged in a 4x4 mm QFN package and is reflow solderable. The optional factory-installed protective cover offers a lowprofile, convenient means of protecting the sensor during assembly (e.g., reflow soldering) and throughout the life of the product, excluding liquids (hydrophobic/oleophobic) and particulates. The Si7005 offers an accurate, low-power, factory-calibrated digital solution ideal for measuring temperature, humidity, and dew-point in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms. Rev. 1.5 8/16 Copyright © 2016 by Silicon Laboratories Si7005 Si7005 Functional Block Diagram MUX Logic ADC Temperature Sensor fo r m en de d om ec R N ot 2 SCL SDA CS Rev. 1.5 I2C pullups may be integrated in microcontroller R = 10 k (typ) PXx N ew Si7005 GND I2C Serial IF es ig n CEXT 32 kHz Osc Humidity Sensor D NV CAL VDD C = 4.7 µF C = 0.1 µF VDD R = 10 k (typ) VDD PXy PXz Microcontroller Si7005 TABLE O F C ONTENTS Section Page N ot R ec om m en de d fo r N ew D es ig n 1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Typical Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2. Relative Humidity Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.3. Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4. Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.5. Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.6. Prolonged Exposure to High Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.7. PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.8. Protecting the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.9. Bake/Hydrate Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.10. Long Term Drift/Aging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5. Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.1. I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2. I2C Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 6. Si7005 Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 7. Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 7.1. Register Detail (Defaults in Bold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 8. Pin Descriptions: Si7005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 9. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 10. Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 10.1. 24-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 10.2. 24-Pin QFN with Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 11. PCB Land Pattern and Solder Mask Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 12. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 12.1. Si7005 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 12.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 13. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 Rev. 1.5 3 Si7005 1. Electrical Specifications Unless otherwise specified, all min/max specifications apply over the recommended operating conditions. Symbol Parameter Power Supply Test Condition VDD Min Typ Max Unit 2.1 3.3 3.6 V 85 °C 70 °C TA G grade –40 — Operating Temperature TA F grade 0 — Table 2. General Specifications Test Condition Input Voltage High VIH CS, SCL, SDA pins Input Voltage Low VIL CS, SCL, SDA pins Input Voltage Range VIN Output Voltage Low Typ Max Unit 0.7xVDD — — V — — 0.3xVDD V SCL, SDA pins with respect to GND 0.0 — 3.6 V CS, CEXT pin with respect to GND 0.0 — VDD V IIL CS, SCL, SDA pins — — ±1 µA VOL SDA pin; IOL = 8.5 mA; VDD = 3.3 V — — 0.6 V SDA pin; IOL = 3.5 mA; VDD = 2.1 V — — 0.4 V m en de d Input Leakage Min fo r Symbol N ew 2.1  VDD  3.6 V; TA = 0 to 70 °C (F grade) or –40 to 85 °C (G grade) unless otherwise noted. D Operating Temperature Parameter es ig n Table 1. Recommended Operating Conditions N ot R ec om Notes: 1. Si7005 can draw excess current if VDD and CS are ramped high together. To enter the lowest power mode, either hold CS low while VDD ramps or pulse CS low after VDD reaches its final value. 2. SDA and SCL pins have an internal 75 k pull-up resistor to VDD. 4 Rev. 1.5 Si7005 Table 2. General Specifications (Continued) 2.1  VDD  3.6 V; TA = 0 to 70 °C (F grade) or –40 to 85 °C (G grade) unless otherwise noted. Min Typ Max Unit IDD RH conversion in progress — 240 560 µA Temperature conversion in progress — 320 Average for 1 temperature and 1 RH conversion / minute — 1 CS < VIL; no conversion in progress; VDD = 3.3 V; SDA = SCL ≥ VIH — CS > VIH — — Power Up Time 565 µA — µA — µA — 100 µA 24 31 150 mA 14-bit temperature; 12-bit RH (Fast = 0) 35 40 13-bit temperature; 11-bit RH (Fast = 1) 18 21 tCS From CS < VIL to ready for a temp/RH conversion 10 15 ms tPU From VDD ≥ 2.1V to ready for a temp/RH conversion 10 15 ms m en de d Wake Up Time tCONV fo r CS < VIL; no conversion in progress; VDD = 3.3 V; SDA = SCL ≥ VIH; HEAT = 1 Conversion Time es ig n Test Condition D Power Consumption Symbol N ew Parameter ms N ot R ec om Notes: 1. Si7005 can draw excess current if VDD and CS are ramped high together. To enter the lowest power mode, either hold CS low while VDD ramps or pulse CS low after VDD reaches its final value. 2. SDA and SCL pins have an internal 75 k pull-up resistor to VDD. Rev. 1.5 5 Si7005 Table 3. I2C Interface Specifications* 2.1 VDD  3.6 V; TA = 0 to 70 °C (F grade) or –40 to +85 °C (G grade) unless otherwise noted. Test Condition Min Typ Max Unit Hysteresis VHYS High-to-low versus low-tohigh transition 0.05 x VDD — — V SCLK Frequency 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 SDA acknowledge valid time tVD;ACK From SCL low to data valid — — 0.9 µs N ew D es ig n Symbol fo r Between Stop and Start m en de d Parameter *Note: All values are referenced to VIL and/or VIH. tSKH 1/fSCL D7 tDS D6 tDH D5 D0 tSPS R/W ACK R SDA tSTH ec tBUF om SCL tSKL N ot Start Bit 6 Stop Bit tVD : ACK tSTS Figure 1. I2C Interface Timing Diagram Rev. 1.5 Si7005 Table 4. Humidity Sensor 2.1  VDD  3.6 V; TA = 25 °C; tCONV = 35 ms unless otherwise noted. Symbol Operating Range1 Test Condition Min Typ Max Unit Non-condensing 0 — 100 %RH — — 12 bit — ±3.0 ±4.5 %RH — %RH RMS Resolution2 Accuracy3,4 20–80% RH 0–100% RH See Figure 2 —  63% — 18 — s — ±1 — %RH — 0.25 — %RH/yr N ew 1 m/s airflow 0.05 D Repeatability—Noise Response Time5 es ig n Parameter Hysteresis Long Term Stability4 m en de d fo r Notes: 1. Recommended humidity operating range is 20 to 80% RH (non-condensing) over 0 to 60 °C. Prolonged operation beyond these ranges may result in a shift of sensor reading, with slow recovery time. 2. The Si7005 has a nominal output of 16 codes per %RH, with 0h0000 = –24%RH. 3. Excludes hysteresis, long term drift, and certain other factors and is applicable to non-condensing environments only. See section “4.2. Relative Humidity Sensor Accuracy” for more details. 4. May be impacted by dust, vaporized solvents or other contaminants, e.g., out-gassing tapes, adhesives, packaging materials, etc. See section “4.10. Long Term Drift/Aging”. 5. Time for sensor output to reach 63% of its final value after a step change. RHAccuracy Max.RHError(±%) 10 om 8 7 ec 6 5 4 R RHMeasurementError(±%) 9 Typ.RHError(±%) N ot 3 2 1 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 RelativeHumidity(%) Figure 2. RH Accuracy at 30 °C Rev. 1.5 7 Si7005 Table 5. Temperature Sensor 2.1  VDD  3.6 V; TA = 0 to 70 °C (F grade) or –40 to +85 °C (G grade); tCONV = 35 ms unless otherwise noted. Test Condition Min Typ Max Unit –40 — 85 °C — — 14 Bit — — 1/32 °C — ±0.5 ±1.0 °C Operating Range Resolution1 Accuracy2 Typical at 25 °C Maximum es ig n Symbol See Figure 3. — 0.1 N ew Repeatability—Noise Response Time3 Time to reach 63% of final value Long Term Stability °C D Parameter — °C RMS — 1.5 — s —