Mr. X presents another high-durability, high-accuracy device from Haechitech’s line of magnetic and environmental sensors, the MXH2101 digital-output temperature-and-relative-humidity sensor, which features an operating temperature of -40˚C to 125˚C (±0.5°C) and a measurement range of 0-100% RH (±3%). The device comes in a compact 2.8 x 3.6 x 0.8 mm, 10-pin DFN package (with cavity), and features selectable I2C, PWM (120 Hz), or PDM outputs with programmable response time and an adjustable output offset.
These specifications make the MXH2101 perfect for use in weather stations, thermostats, agricultural systems, and wearables, the latter of which is surely enabled by the MXH2101’s low average current consumption of 68 µA (in 8-bit operation mode); when in sleep mode, this current consumption shrinks to 0.13 µA. The 2.1-3.6 V supply allows for flexibility in circuit design with the rest of your system, and excellent long-term stability with robust operation against external noise ensure lasting accuracy in products with long-term outdoor deployments. Up to 2 Hz measurement frequency ensures fast response times in applications that require regular environmental updates.
As with most of their sensors, Haechitech’s EVK1000 evaluation board allows a user to easily access data from one of their MXH2101 testing boards. It also allows the use of several different sensor combinations for simultaneous measurement, should you decide that Haechitech sensing infrastructure serves all aspects of your application.
While the MXH2101 may not be the lowest-power option that ipXchange has written about – that goes to Sensirion’s SHT41 as part of Rutronik’s Sensorfusion board – the proven application record in harsh environments makes the MXH2101 worth a look. The lower cost and faster response time may also win out in many other deployments that alternatives are not suitable for. In conjunction with Haechitech’s Hall sensors, Hall switches, and digital compass IC, perhaps it would be worth automotive engineers considering this device when testing Haechitech’s other components. Mr. X is intrigued to see whether they could stand up to that sort of punishment…