TIDA-00972

±2% Accurate Humidity Sensing Reference Design Supporting Robust 2m Wire Communication

TIDA-00972

Design files

Overview

The TIDA-00972 reference design provides a sensor module level solution for +/- 2% of accuracy and reliable Relative Humidity (RH) and +/- 0.2 °C accuracy temperature sensing. The sensor module utilizes TI’s digital humidity and temperature sensor HDC1080 together with integrated communication bus buffer TCA9517 to provide high accuracy sensing result with robust communication over meters of wiring distance.

The reference design addresses the key considerations during development and manufacturing of the sensor module with test results.

Features
  • Relative humidity accuracy ±2%, temperature accuracy ±0.2°C
  • Small form factor of PCB size 15.7 mm x 7.6 mm
  • Very low power consumption during operation and when idle: 1.2uA without I2C buffer. Supply cut during idle.
  • Supports long-cable I2C communication over common wire (AWG24 with 2 meter length)
  • Supports both 5V and 3.3V power supply

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUBL7A.PDF (6475 K)

Reference design overview and verified performance test data

TIDRMH4.PDF (155 K)

Detailed schematic diagram for design layout and components

TIDRMH5.PDF (170 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRMH6.PDF (64 K)

Detailed overview of design layout for component placement

TIDRMH8.ZIP (174 K)

Files used for 3D models or 2D drawings of IC components

TIDCCC5.ZIP (166 K)

Design file that contains information on physical board layer of design PCB

TIDRMH7.PDF (239 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Humidity sensors

HDC10802% RH low-power digital relative humidity sensor

Data sheet document-pdfAcrobat PDF open-in-new HTML
I2C level shifters, buffers & hubs

TCA95172-bit level-translating 400-kHz I2C/SMBus buffer/repeater with powered-off high-impedance

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Software

Firmware

TIDA-00972 Firmware — TIDCCC6.ZIP (119 K)

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Technical documentation

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Type Title Date
* Design guide ±2% Accurate Humidity-Sensing Reference Design Supporting 2-m Wire Communication (Rev. A) Nov. 09, 2016
More literature TIDA-00972 Firmware Jun. 23, 2016

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