PDF SI7015-A20 Data sheet ( Hoja de datos )

Número de pieza	SI7015-A20
Descripción	DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR
Fabricantes	Silicon Laboratories
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No Preview Available ! Si7015-A20 DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR Features  Precision Relative Humidity Sensor  Drop-In Upgrade for Si7005 ± 4.5% RH (max), 0–80% RH  Factory-calibrated  High-Accuracy Temperature Sensor  I2C Interface ±1 ºC (max), –10 to 85 °C  0 to 100% RH operating range  Integrated on-chip heater  4x4 mm QFN package  0 to +70 °C operating range (FM)  Excellent long term stability  –40 to +85 °C operating range (GM)  Optional factory-installed  Low Voltage Operation (1.9 to 3.6 V) cover  Low Power Consumption Low-profile 150 µA active current Protection during reflow 60 nA standby current Excludes liquids and particulates Applications  HVAC/R  Thermostats/humidistats  Instrumentation  White goods  Micro-environments/data centers  Industrial controls  Weather stations  Asset tracking and storage Description The Si7015 I2C Humidity and Temperature Sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to- digital converter, signal processing, calibration data, and an I2C Interface. The patented use of industry-standard, low-K polymeric dielectrics for sensing humidity enables the construction of low-power, monolithic CMOS Sensor ICs with low drift and hysteresis and excellent long term stability. Each unit is 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 Si7015 can be used as a drop-in upgrade for the Si7005 with only minor software changes because the register sets are the same, and the 4x4 mm QFN package is footprint-compatible with that of the Si7005. The device is compatible with standard SMT assembly processes, such as reflow. The optional factory-installed cover offers a low profile and 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 Si7015 offers an accurate, low-power, factory-calibrated digital solution ideal for measuring humidity, dew-point, and temperature in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms. Ordering Information See page 31. Patent protected; patents pending Pin Assignments GND DNC 1 2 SCL SDA DNC 3 4 5 DNC 6 18 DNC 17 DNC 16 DNC 15 CS 14 DNC 13 DNC Rev. 1.0 1/15 Copyright © 2015 by Silicon Laboratories Si7015-A20 1 page Si7015-A20 Table 2. General Specifications (Continued) 1.9 < VDD < 3.6 V; TA = –40 to 85 °C (G grade) or 0 to 70 °C (F grade); default conversion time unless otherwise noted. Parameter Symbol Test Condition1 Min Typ Max Unit Wake Up Time tCS From CS < VIL to ready for a temp/RH — — 1 ms conversion Power Up Time tPU From VDD ≥ 1.9 V to ready for a temp/ RH conversion, 25°C From VDD ≥ 1.9 V to ready for a temp/ RH conversion, full temperature range — — 18 25 ms — 80 ms Notes: 1. Initiating a RH measurement will also automatically initiate a temperature measurement. The total conversion time will be tCONV(RH) + tCONV(T). 2. No conversion or I2C transaction in progress. Typical values measured at 25 °C. 3. Occurs once during powerup. Duration is <5 msec. 4. Occurs during I2C commands for Read Device ID and Read Firmware Version. Duration is < 100 µs when I2C clock speed is >100 kHz. Table 3. I2C Interface Specifications1 1.9 VDD  3.6 V; TA = 0 to 70 °C (F grade) or –40 to +85 °C (G grade) unless otherwise noted. Parameter Symbol Test Condition Min Typ Hysteresis VHYS High-to-low versus low-to- 0.05 x VDD high transition — SCLK Frequency fSCL SCL High Time tSKH SCL Low Time tSKL Start Hold Time tSTH Start Setup Time tSTS Stop Setup Time tSPS Bus Free Time tBUF Between Stop and Start SDA Setup Time tDS SDA Hold Time tDH SDA Valid Time tVD;DAT From SCL low to data valid SDA Acknowledge Valid Time Suppressed Pulse Width2 tVD;ACK From SCL low to data valid tSP Notes: 1. All values are referenced to VIL and/or VIH. 2. Pulses up to and including 50ns will be suppressed. — 0.6 1.3 0.6 0.6 0.6 1.3 100 100 — — 50 — — — — — — — — — — — — Max Unit —V 400 kHz — µs — µs — µs — µs — µs — µs — ns — ns 0.9 µs 0.9 µs — ns Rev. 1.0 5 5 Page Si7015-A20 3. Bill of Materials Table 8. Typical Application Circuit BOM* Reference Description Mfr Part Number Manufacturer C1 Capacitor, 0.1 µF, 6.3 V, X7R, 0603 C0603X7R6R3-104M Venkel R1* Resistor, 10 k, ±5%, 1/16 W, 0603 CR0603-16W-1002J Venkel R2* Resistor, 10 k, ±5%, 1/16 W, 0603 CR0603-16W-1002J Venkel U1 IC, digital temperature/humidity sensor Si7015-A20 Silicon Labs *Note: Typical value shown. Optimal value depends on bus capacitance and speed of bus operation; not needed if present elsewhere in the system. Rev. 1.0 11 11 Page

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