Technical datasheet for the ASAIR AM2301A digital temperature‑humidity sensor, covering specifications, interface and usage guidelines.
The AM2301A is a fully calibrated digital temperature‑humidity sensor with a single‑wire (1‑wire) digital output. It offers a wide operating range (‑40 °C to 80 °C, 0‑80 %RH) and high long‑term stability, making it suitable for HVAC, weather stations, data loggers and many other applications.
The document provides detailed electrical characteristics, mechanical dimensions, communication protocol, recommended wiring practices, and handling/storage instructions. It also includes a packaging overview and version history for reference. This manual is written in Chinese.
| Supply voltage (VDD) | 3.3 V – 5.5 V (recommended 5 V) |
|---|---|
| Output interface | Digital 1‑wire (single‑bus) |
| Humidity measurement range | 0 % RH – 80 % RH |
| Temperature measurement range | ‑40 °C – 80 °C |
| Accuracy (typical) | ±3 % RH, ±0.5 °C |
| Response time (63 % of final value) | ≈ 1 s at 25 °C, 1 m/s airflow |
| Maximum cable length (recommended) | ≤ 30 m with 5.1 kΩ pull‑up; longer runs need lower pull‑up |
| Minimum read interval | 2 seconds |
The sensor operates from 3.3 V to 5.5 V, with 5 V being the recommended voltage.
For cable lengths up to 30 m use a 5.1 kΩ pull‑up resistor; longer cables need a lower pull‑up value.
The sensor provides a typical accuracy of ±3 % RH and ±0.5 °C.
The minimum interval between consecutive reads is 2 seconds.