HTS221 STMicroelectronics

HTS221 Capacitive digital sensor for relative humidity and temperature Datasheet - production data Applications Air conditioning, heating and ventilation Air humidifiers Refrigerators Wearable devices Smart home automation Industrial automation HLGA-6L Respiratory equipments (2 x 2 x 0.9 mm) Asset and goods tracking Description Features The HTS221 is an ultra compact sensor for relative humidity and temperature. It includes a 0 to 100% relative humidity range sensing element and a mixed signal ASIC to Supply voltage: 1.7 to 3.6 V provide the measurement information through digital serial interfaces. Low power consumption: 2 A 1 Hz ODR The sensing element consists of a polymer Selectable ODR from 1 Hz to 12.5 Hz dielectric planar capacitor structure capable of High rH sensitivity: 0.004% rH/LSB detecting relative humidity variations and is Humidity accuracy: 4.5% rH, 20 to +80% rH manufactured using a dedicated ST process. Temperature accuracy: 0.5 C,15 to +40 C The HTS221 is available in a small top-holed cap Embedded 16-bit ADC land grid array (HLGA) package guaranteed to operate over a temperature range from -40 C to 16-bit humidity and temperature output data +120 C. SPI and IC interfaces Factory calibrated Tiny 2 x 2 x 0.9 mm package ECOPACK compliant Table 1. Device summary Order code Temperature range C Package Packing HTS221TR -40 to +120 HLGA-6L Tape and reel April 2015 DocID026333 Rev 2 1/31 This is information on a product in full production. www.st.comContents HTS221 Contents 1 HTS221 block diagram . 4 1.1 Pin information 4 2 Sensor parameters and electrical specifications 6 2.1 Communication interface characteristics 7 2.1.1 SPI - serial peripheral interface 7 2.1.2 IC - control interface 8 2.2 Absolute maximum ratings . 9 3 Functionality 10 3.1 IC interface 10 3.2 Factory calibration 10 4 Application hints . 11 4.1 Soldering information 11 5 Digital interfaces . 12 5.1 I2C serial interface (CS = HIGH or unconnected CS) . 12 5.1.1 IC operation . 12 5.2 SPI bus interface (CS = LOW) . 15 5.2.1 SPI write 15 5.2.2 SPI read . 16 6 Register mapping 17 7 Register description 18 7.1 WHO AM I (0Fh) . 18 7.2 AV CONF (10h) 18 7.3 CTRL REG1 (20h) 19 7.4 CTRL REG2 (21h) 21 7.5 CTRL REG3 (22h) 22 7.6 STATUS REG . (27h) 22 7.7 HUMIDITY OUT L (28h) . 23 2/31 DocID026333 Rev 2