DPP301Z000

HTU21D PERIPHERAL MODULE Digital Humidity and Temperature Sensor General Description The HTU21D peripheral module provides the necessary hardware to interface the HTU21D digital relative humidity and temperature sensor to any system that 2 utilizes Pmod compatible expansion ports configurable for I C communication. The HTU21D sensor is a self-contained humidity and temperature sensor that is fully calibrated during manufacture. The sensor can operate from 1.5V to 3.6V, has selectable resolution, low battery detect, and checksum capability. The HTU21D has a low current stand-by mode for power-sensitive applications . Specifications • Measures relative humidity from 0% to 100% • Measures temperature from -40°C to 125°C • Humidity resolution selectable from 8 to 12 bits • Temperature resolution selectable from 11 to 14 bits • 0.14 µA sleep current • 500 µA operating current (during measurement only) • ±3% accuracy Features • 12-pin Pmod compatible connector • I C interface • Secondary 12-pin connector allows daisy chain • FPGA fabric available for download • µC C code available for download • Built-in heater to remove condensation • Available with PTFE environmental filter over the sensor • Electronic ID code stored on chip 2 HTU21D Peripheral Module Performance • Covers full humidity range of 0 to 100% RH • Broad temperature range of -40°C to 125°C • Use output data to calculate absolute humidity and dew point • Quick recovery from condensation – 10 seconds • Fast response time to humidity changes – 5 seconds typical • Fully calibrated and interchangeable • Recovers fully from condensation • Fast digital conversion time – 14 mS typical Schematic SENSOR SOLUTIONS /// HTU21D PERIPHERAL MODULE Page 2 HTU21D Peripheral Module Connector Pin Assignments (12C Communications) System Plug (Table 1) Expansion Socket (Table 2) Connector J1 Connector J2 Pin No. Signal Description Pin No. Signal Description 1 N/C Not Connected 1 N/C Not Connected 2 N/C Not Connected 2 N/C Not Connected 3 SCL I C Serial Clock 2 3 SCL I C Serial Clock 2 I C Serial Data 4 SDA I C Serial Data 2 2 4 SDA 5 GND Ground 5 GND Ground 6 Vdd Power Supply 6 Vdd Power Supply 7 N/C Not Connected 7 N/C Not Connected 8 N/C Not Connected 8 N/C Not Connected 9 SCL I C Serial Clock 2 9 N/C Not Connected 10 SDA I C Serial Data 2 10 N/C Not Connected 11 GND Ground 11 N/C Not Connected 12 Vdd Power Supply 12 N/C Not Connected Dimensions(mm) SENSOR SOLUTIONS /// HTU21D PERIPHERAL MODULE Page 3 HTU21D Peripheral Module Detailed Description 2 I C Interface 2 The peripheral module can interface to the host in one of two ways. It can plug directly into a Pmod-compatible port (configured for I C) 2 through connector J1, or to other I C boards that have a Pmod configured expansion connector. 2 I C Interface (Daisy Chaining Modules) Connector J1 provides connection of the module to the Pmod host. The pin assignments and functions adhere to the Pmod standar d as shown in Table 1. The J2 connector allows additional Pmod modules to be connected in a daisy-chain fashion. See Table 2. External Control Signals 2 2 The IC operates as an I C slave using the standard 2 wire I C connection scheme. The IC is controlled by the host (through the Pmod connector). In cases where one or more of the SCL and SDA signals are driven from an external source, resistors R1, R2 provide pull-up. However, this also increases the apparent load to the external driving source. If the external source is incapable of driving these loads, they should be removed from the PC board. Reference Material  Detailed information regarding operation of the IC: HTU21D Datasheet  Detailed information regarding the MicroZed Driver: HTU21D MicroZed Driver  Complete software sensor evaluation kit for MicroZed: HTU21D MicroZed Software  Detailed information regarding the ZedBoard Driver: HTU21D ZedBoard Driver  Complete software sensor evaluation kit for ZedBoard: HTU21D ZedBoard Software Ordering Information Description HTU21D PERIPHERAL MODULE Part Number DPP301Z000 te.com/sensorsolutions TE Connectivity, TE Connectivity (logo) and Every Connection Counts are trademarks. All other logos, products and/or company names referred to herein might be trademarks of their respective owners. The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reliable. However, TE Connectivity makes no warranties as to its accuracy or completeness and disclaims any liability in connection with its use. TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s Standard Terms and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse of the product. Users of TE Connectivity products should make their own evaluation to determine the suitability of each such product for the specific application. © 2015 05/15 TE Connectivity Ltd. family of companies All Rights Reserved. PRODUCT SHEET Contact us: Measurement Specialties Inc – MEAS France Impasse Jeanne Benozzi CS 83 163 31027 Toulouse Cedex 3, FRANCE Tel:+33 (0)5 820.822.02 Fax:+33 (0)5.820.821.51 Sales: sales.tlse.fr@meas-spec.com MEAS Website: http://www.meas-spec.com/DCS_TBD Original SENSOR SOLUTIONS /// HTU21D PERIPHERAL MODULE Page 4