Si1145数据手册(Si1145-46-47).pdf

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1. Electrical Specifications

1.1. Performance Tables

1.2. Typical Performance Graphs

2. Functional Description

2.1. Introduction

2.2. Proximity Sensing (PS)

2.3. Ambient Light

2.4. Ultraviolet (UV) Index

2.5. Host Interface

3. Operational Modes

3.1. Off Mode

3.2. Initialization Mode

3.3. Standby Mode

3.4. Forced Conversion Mode

3.5. Autonomous Operation Mode

4. Programming Guide

4.1. Command and Response Structure

4.2. Command Protocol

4.3. Resource Summary

4.4. Signal Path Software Model

4.5. I2C Registers

4.6. Parameter RAM

5. Pin Descriptions

6. Ordering Guide

7. Package Outline: 10-Pin QFN

8. Suggested PCB Land Pattern

Document Change List

Si1145/46/47 PROXIMITY/UV/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE Pin Assignments SDA SCL VDD INT 1 2 3 4 DNC 10 QFN-10 5 DNC 9 8 7 6 LED1 GND LED3/CVDD LED2/CVDD Features  Integrated infrared proximity detector Proximity detection adjustable from  Integrated UV index sensor  Industry's lowest power consumption under 1 cm to over 50 cm Three independent LED drivers 15 current settings from 5.6 mA to 360 mA for each LED driver 25.6 µs LED driver pulse width 50 cm proximity range with single 15 cm proximity range with single power-on reset controller 1.71 to 3.6 V supply voltage 9 µA average current (LED pulsed 25.6 µs every 800 ms at 180 mA plus 3 µA Si114x supply) < 500 nA standby current Internal and external wake support Built-in voltage supply monitor and 25.6 µs LED “on” time keeps total power consumption duty cycle low without compromising performance or noise immunity  I2C Serial communications Up to 3.4 Mbps data rate Slave mode hardware address decoding  Small-outline 10-lead 2x2 mm QFN  Temperature Range –40 to +85 °C pulse (<3 klx) pulse (>3 klx) sunlight) < 1 µW/cm2 packaging Operates at up to 128 klx (direct High reflectance sensitivity High EMI immunity without shielded  Integrated ambient light sensor 100 mlx resolution possible, allowing operation under dark glass 1 to 128 klx dynamic range possible across two ADC range settings Accurate lux measurements with IR correction algorithm Applications  Handsets  E-book readers  Notebooks/Netbooks  Portable consumer electronics  Audio products  Security panels  Tamper detection circuits  Dispensers Description  Valve controls  Smoke detectors  Touchless switches  Touchless sliders  Occupancy sensors  Consumer electronics  Industrial automation  Display backlighting control  Photo-interrupters The Si1145/46/47 is a low-power, reflectance-based, infrared proximity, ultraviolet (UV) index, and ambient light sensor with I2C digital interface and programmable- event interrupt output. This touchless sensor IC includes an analog-to-digital converter, integrated high-sensitivity visible and infrared photodiodes, digital signal processor, and one, two, or three integrated infrared LED drivers with fifteen selectable drive levels. The Si1145/46/47 offers excellent performance under a wide dynamic range and a variety of light sources including direct sunlight. The Si1145/46/ 47 can also work under dark glass covers. The photodiode response and associated digital conversion circuitry provide excellent immunity to artificial light flicker noise and natural light flutter noise. With two or more LEDs, the Si1146/47 is capable of supporting multiple-axis proximity motion detection. The Si1145/46/47 devices are provided in a 10-lead 2x2 mm QFN package and are capable of operation from 1.71 to 3.6 V over the –40 to +85 °C temperature range. Rev. 1.3 12/14 Copyright © 2014 by Silicon Laboratories Si1145/46/47

Si1145/46/47 Functional Block Diagram VDD INT SCL SDA A M U X Regulator Temp Visible Infrared I2C ADC Filter LED Drivers LED1 LED21 LED32 Digital Sequencer & Control Logic Registers Oscillator GND 1. Si1146 and Si1147 only. Must be tied to VDD with Si1145. 2. Si1147 only. Must be tied to VDD with Si1145 and Si1146. 3.3 V Host SDA SCL INT 3.3 V Host Si1145 SDA SCL VDD INT LED1 GND CVDD CVDD 0.1 uF 30 ohm 5%, 1/16 W 15 µF, 20%, >6 V Figure 1. Si1145 Basic Application 4.3 V No Pop 30 ohm 5%, 1/16 W 22 uF, 20%, >6V Si1147 SDA SCL VDD INT LED1 GND LED3 LED2 0.1 uF Figure 2. Si1147 Application with Three LEDs and Separate LED Power Supply Note: For more application examples, refer to “AN498: irLED Selection Guide for Si114x Proximity Applications”. 2 Rev. 1.3

TABLE OF CONTENTS Si1145/46/47 1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1.1. Performance Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1.2. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 2.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 2.2. Proximity Sensing (PS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 2.3. Ambient Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 2.4. Ultraviolet (UV) Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 2.5. Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 3. Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 3.1. Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 3.2. Initialization Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 3.3. Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 3.4. Forced Conversion Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 3.5. Autonomous Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 4. Programming Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 4.1. Command and Response Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 4.2. Command Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 4.3. Resource Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 4.4. Signal Path Software Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 4.5. I2C Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 4.6. Parameter RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 5. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60 6. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61 7. Package Outline: 10-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62 8. Suggested PCB Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64 Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67 Rev. 1.3 3

Si1145/46/47 1. Electrical Specifications 1.1. Performance Tables Table 1. Recommended Operating Conditions Parameter Symbol Test Condition VDD Supply Voltage VDD OFF Supply Voltage VDD Supply Ripple Voltage VDD VDD_OFF Operating Temperature SCL, SDA, Input High Logic Voltage SCL, SDA Input Low Logic Voltage PS Operation under Direct Sunlight IrLED Emission Wavelength IrLED Supply Voltage IrLED Supply Ripple Voltage T I2CVIH I2CVIL Edc l VLED Start-Up Time LED3 Voltage OFF mode VDD = 3.3 V 1 kHz–10 MHz Min 1.71 –0.3 — –40 VDDx0.7 Typ — — 25 — Max Unit 3.6 1.0 50 85 VDD 128 950 4.3 250 100 — — V V mVpp °C V V klx nm V mVpp mVpp ms V — VDDx0.3 0 — 750 VDD — — 25 IrLED VF = 1.0 V nominal Applies if IrLEDs use separate supply rail 0–30 kHz 30 kHz–100 MHz VDD above 1.71 V — 850 — — — — Start-up VDDx0.77 — 4 Rev. 1.3

— — — — — — — — — — — — — — — — — — — — — 4.3 8 50 60 70 80 115 150 185 220 255 290 315 340 360 385 410 25.6 5.5 — 70 105 105 105 450 450 450 450 450 450 600 600 600 600 600 30 mA mA mV µs µA Iactive Without LED influence, VDD = 3.3 V VDD = 3.3 V Vdd=1.71 to 3.6 V PS_LEDn=0001 PS_LEDn=0010 PS_LEDn=0011 PS_LEDn=0100 PS_LEDn=0101 PS_LEDn=0110 PS_LEDn=0111 PS_LEDn=1000 PS_LEDn=1010 PS_LEDn=1010 PS_LEDn=1011 PS_LEDn=1100 PS_LEDn=1101 PS_LEDn=1110 PS_LEDn=1111 tPS IDD Actively Measuring Peak IDD while LED1, LED2, or LED3 is Actively Driven LED Driver Saturation Voltage2,3 LED1, LED2, LED3 Pulse Width LED1, LED2, LED3, INT, SCL, SDA Leakage Current Notes: Si1145/46/47 Table 2. Performance Characteristics1 Parameter Symbol Test Condition Min IDD OFF Mode IDD Standby Mode IDD Standby Mode Ioff Isb Isb VDD < VDD_OFF (leakage from SCL, SDA, and INT not included) No ALS / PS Conversions No I2C Activity VDD = 1.8 V No ALS / PS Conversions No I2C Activity VDD =3.3 V Typ 240 Max 1000 150 500 Unit nA nA 1.4 — µA VDD = 3.3 V –1 — 1 1. Unless specifically stated in "Conditions", electrical data assumes ambient light levels < 1 klx. 2. Proximity-detection performance may be degraded, especially when there is high optical crosstalk, if the LED supply and voltage drop allow the driver to saturate and current regulation is lost. 3. Guaranteed by design and characterization. 4. Represents the time during which the device is drawing a current equal to Iactive for power estimation purposes. Assumes default settings. Rev. 1.3 5

Si1145/46/47 Table 2. Performance Characteristics1 (Continued) Parameter LED1, LED2, LED3 Active Current Symbol ILEDx Actively Measuring Time4 Visible Photodiode Response Test Condition Min Typ Max VDD = 3.3 V, single drive VLEDn = 1 V, PS_LEDn = 0001 VLEDn = 1 V, PS_LEDn = 0010 VLEDn = 1 V, PS_LEDn = 0011 VLEDn = 1 V, PS_LEDn = 0100 VLEDn = 1 V, PS_LEDn = 0101 VLEDn = 1 V, PS_LEDn = 0110 VLEDn = 1 V, PS_LEDn = 0111 VLEDn = 1 V, PS_LEDn = 1000 VLEDn = 1 V, PS_LEDn = 1001 VLEDn = 1 V, PS_LEDn = 1010 VLEDn = 1 V, PS_LEDn = 1011 VLEDn = 1 V, PS_LEDn = 1100 VLEDn = 1 V, PS_LEDn = 1101 VLEDn = 1 V, PS_LEDn = 1110 VLEDn = 1 V, PS_LEDn = 1111 Single PS UV or ALS VIS + ALS IR Two ALS plus three PS Sunlight ALS_VIS_ADC_GAIN=0 VIS_RANGE=0 2500K incandescent bulb ALS_VIS_ADC_GAIN=0 VIS_RANGE=0 “Cool white” fluorescent ALS_VIS_ADC_GAIN=0 VIS_RANGE=0 Infrared LED (875 nm) ALS_VIS_ADC_GAIN=0 VIS_RANGE=0 3.5 — 13 — — — — — — — — — — — — — — — — 5.6 11.2 22.4 45 67 90 112 135 157 180 202 224 269 314 359 155 285 660 0.282 7 — 29 — — — — — — — — — — — — — — — — — 0.319 — — 0.146 — — 8.277 — Unit mA µs µs µs ADC counts/ lux ADC counts/ lux ADC counts/ lux ADC counts. m2/W Notes: 1. Unless specifically stated in "Conditions", electrical data assumes ambient light levels < 1 klx. 2. Proximity-detection performance may be degraded, especially when there is high optical crosstalk, if the LED supply and voltage drop allow the driver to saturate and current regulation is lost. 3. Guaranteed by design and characterization. 4. Represents the time during which the device is drawing a current equal to Iactive for power estimation purposes. Assumes default settings. 6 Rev. 1.3

Table 2. Performance Characteristics1 (Continued) Parameter Symbol Test Condition Small Infrared Photodiode Response Large Infrared Photodi- ode Response Sunlight ALS_IR_ADC_GAIN=0 IR_RANGE=0 2500K incandescent bulb ALS_IR_ADC_GAIN=0 IR_RANGE=0 “Cool white” fluorescent ALS_IR_ADC_GAIN=0 IR_RANGE=0 Infrared LED (875 nm) ALS_IR_ADC_GAIN=0 IR_RANGE=0 Sunlight PS_ADC_GAIN=0 PS_RANGE=0 PS_ADC_MODE=0 2500K incandescent bulb PS_ADC_GAIN=0 PS_RANGE=0 PS_ADC_MODE=0 “Cool white” fluorescent PS_ADC_GAIN=0 PS_RANGE=0 PS_ADC_MODE=0 Infrared LED (875 nm) PS_ADC_GAIN=0 PS_RANGE=0 PS_ADC_MODE=0 Visible Photodiode Noise All gain settings Small Infrared Photodiode Noise All gain settings Si1145/46/47 Min — Typ 2.44 — Max Unit — 8.46 — — 0.71 — — 452.38 — — 14.07 — — 50.47 — — 3.97 — — 2734 — — — 7 1 — — ADC counts/ lux ADC counts/ lux ADC counts/ lux ADC counts. m2/W ADC counts/ lux ADC counts/ lux ADC counts/ lux ADC counts. m2/W ADC counts RMS ADC counts RMS Notes: 1. Unless specifically stated in "Conditions", electrical data assumes ambient light levels < 1 klx. 2. Proximity-detection performance may be degraded, especially when there is high optical crosstalk, if the LED supply and voltage drop allow the driver to saturate and current regulation is lost. 3. Guaranteed by design and characterization. 4. Represents the time during which the device is drawing a current equal to Iactive for power estimation purposes. Assumes default settings. Rev. 1.3 7

Si1145/46/47 Table 2. Performance Characteristics1 (Continued) Parameter Symbol Large Infrared Photodi- ode Noise Visible Photodiode Offset Drift Small Infrared Photodiode Offset Drift Test Condition All gain settings VIS_RANGE=0 ALS_VIS_ADC_GAIN=0 ALS_VIS_ADC_GAIN=1 ALS_VIS_ADC_GAIN=2 ALS_VIS_ADC_GAIN=3 ALS_VIS_ADC_GAIN=4 ALS_VIS_ADC_GAIN=5 ALS_VIS_ADC_GAIN=6 ALS_VIS_ADC_GAIN=7 IR_RANGE=0 IR_GAIN=0 IR_GAIN=1 IR_GAIN=2 IR_GAIN=3 SCL, SDA, INT Output Low Voltage VOL I = 4 mA, VDD > 2.0 V I = 4 mA, VDD < 2.0 V Temperature Sensor Off- set Temperature Sensor Gain 25 °C Min — — — — — — — Typ 10 –0.3 –0.11 –0.06 –0.03 –0.01 –0.008 –0.007 –0.008 –0.3 –0.06 –0.03 –0.01 — — 11136 35 Max Unit — — ADC counts RMS ADC counts/ °C — ADC counts/ °C VDDx0. 2 0.4 V V — — ADC counts ADC counts/ °C Notes: 1. Unless specifically stated in "Conditions", electrical data assumes ambient light levels < 1 klx. 2. Proximity-detection performance may be degraded, especially when there is high optical crosstalk, if the LED supply and voltage drop allow the driver to saturate and current regulation is lost. 3. Guaranteed by design and characterization. 4. Represents the time during which the device is drawing a current equal to Iactive for power estimation purposes. Assumes default settings. 8 Rev. 1.3

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