htu21d peripheral module digital h umidity and temperatur e sensor general description the htu21 d peripheral module provides the necessary h ardware to interface the htu21 d digital relative humidity and temperature sensor t o any system that utilizes pmod compatible expansion ports configurable for i 2 c communication. the htu21 d 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 de tect, and checksum capability. the htu21 d has a low current stand - by mode for power - sensitive applications . specification s ? measures relative humidity from 0% to 100% ? measures temperature from - 40c to 125c ? humidity resolution selectable from 8 to 12 bits ? temperature resolution selectable from 11 to 14 bits ? 0.14 a sleep current ? 500 a operating current (during measurement only) ? 3% accuracy features ? 12 - pin pmod compatible connector ? i 2 c interface ? secondary 12 - pin connector allows daisy chain ? fpga fabric available for download ? c 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
htu21d peripheral module sensor solutions /// htu21d peripheral module page 2 performance ? covers full humidity range of 0 to 100% rh ? broad temperature range of - 40c to 125c ? use output data to calculate absolute humidity and dew point ? quick recovery from condensation C 10 seconds ? fast response time to humidity changes C 5 seconds typical ? fully calibrated and interchangeable ? recovers fully from condensation ? fast digital conversion time C 14 ms typical schematic
htu21d peripheral module sensor solutions /// htu21d peripheral module page 3 connector pin assignments (1 2 c communications) system plug (table 1) expansion socket (table 2) dimensions(mm) connector j1 pin no. signal description 1 n/c not connected 2 n/c not connected 3 scl i 2 c serial clock 4 sda i 2 c serial data 5 gnd ground 6 vdd power supply 7 n/c not connected 8 n/c not connected 9 scl i 2 c serial clock 10 sda i 2 c serial data 11 gnd ground 12 vdd power supply connector j2 pin no. signal description 1 n/c not connected 2 n/c not connected 3 scl i 2 c serial clock 4 sda i 2 c serial data 5 gnd ground 6 vdd power supply 7 n/c not connected 8 n/c not connected 9 n/c not connected 10 n/c not connected 11 n/c not connected 12 n/c not connected
htu21d peripheral module sensor solutions /// htu21d peripheral module page 4 detailed description i 2 c interface 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 2 c) through con nector j1, or to other i 2 c boards that have a pmod configured expansion connector . i 2 c inte rface (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 tabl e 1. the j2 connector allows additional pmod module s to be connected in a daisy - chain fashion. see table 2. external control signals the ic operates as an i 2 c slave using the standard 2 wire i 2 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 s ignals are driven from an external source, resistors r1, r 2 provide pull - up. however, this also increases the apparent load to the external driving source. if the external source is i n ca pable of driving thes e loads, they should be removed from the pc boar d. 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 softwar e ordering information description part number htu21d peripheral module dpp301z000 product sheet contact us: measurement specialties inc C 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 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 warrantie s as to its accuracy or completeness and disclaims any liability in connection with its use. te connectivitys obligations shall only be as set forth in te connectivitys standard terms and conditions of sale for this product and in no case will te connect 05/15 original
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