HTU21D

HTU21D(F) Sensor Digital Relative Humidity sensor with Temperature output  DFN type package  Relative Humidity and Temperature Digital Output, I²C interface  Fully calibrated  Lead free sensor, reflow solderable  Low power consumption  Fast response time DESCRIPTION The HTU21D(F) is a new digital humidity sensor with temperature output by MEAS. Setting new standards in terms of size and intelligence, it is embedded in a reflow solderable Dual Flat No leads (DFN) package with a small 3 x 3 x 0.9 mm footprint. This sensor provides calibrated, linearized signals in digital, I²C format. HTU21D(F) digital humidity sensors are dedicated humidity and temperature plug and play transducers for OEM applications where reliable and accurate measurements are needed. Direct interface with a micro-controller is made possible with the module for humidity and temperature digital outputs. These low power sensors are designed for high volume and cost sensitive applications with tight space constraints. Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronic identification code is stored on the chip – which can be read out by command. Low battery can be detected and a checksum improves communication reliability. The resolution of these digital humidity sensors can be changed by command (8/12bit up to 12/14bit for RH/T). With MEAS’ improvements and miniaturization of this sensor, the performance-to-price ratio has been improved – and eventually, any device should benefit from its cutting edge energy saving operation mode. Optional PTFE filter/membrane (F) protects HTU21D digital humidity sensors against dust and water immersion, as well as against contamination by particles. PTFE filter/membranes preserve a high response time. The white PTFE filter/membrane is directly stuck on the sensor housing. FEATURES     APPLICATIONS Full interchangeability with no calibration required in standard conditions Instantaneous desaturation after long periods in saturation phase Compatible with automatized assembly processes, including Pb free and reflow processes Individual marking for compliance to stringent traceability requirements HPC199_3 HTU21D(F) Sensor Datasheet      Automotive: defogging, HVAC Home Appliance Medical Printers Humidifier www.meas-spec.com 1/21 October 2013 HTU21D(F) Sensor Digital Relative Humidity sensor with Temperature output NOMENCLATURE HTU2XY(F) With embedded PTFE filter: HTU2XYF Output Sensor: Y = D for Digital, I2C protocol = P for PWM interface, analog output = S for SDM interface convertible to analog output Humidity accuracy : X = 0: +/-5%RH tolerance @55%RH = 1: +/-3%RH tolerance @55%RH HTU2XY Modules HTU2XYF Modules PERFORMANCE SPECS MAXIMUM RATINGS Ratings Symbol Value Unit Storage Temperature Tstg -40 to 125 °C Supply Voltage (Peak) Vcc 3.8V Vdc Humidity Operating Range RH 0 to 100 %RH Temperature Operating Range Ta -40 to +125 °C VDD to GND Digital I/O pins (DATA/SCK) to VDD Input current on any pin Peak conditions: less than 10% of the operating time -0.3 to 3.6V V -0.3 to VDD+0.3 V -10 to +10 mA Exposure to absolute maximum rating conditions for extended periods may affect the sensor reliability. HPC199_3 HTU21D(F) Sensor Datasheet www.meas-spec.com 2/21 October 2013 HTU21D(F) Sensor Digital Relative Humidity sensor with Temperature output ELECTRICAL AND GENERAL ITEMS (@T = 25°C, @Vdd = 3V) Characteristics Symbol Min Voltage Supply VDD 1.5 Current consumption Sleep mode (1) idd Measuring Typ 300 Sleep mode Power Dissipation Average 8bit (2) Max Unit 3.0 3.6 V 0.02 0.14 µA 450 500 µA 0.06 0.5 µW 2.7 Communication µW digital 2-wire interface, I²C protocol Heater 5.5mW/ΔT=+0.5-1.5°C VDD=3V Storage (1) Conditions: Vdd = 3V, SCK= 400kHz at 25°C (2) Conditions: Vdd = 3V, SCK= 400kHz, Temp