SHT21 is a fully calibrated digital output I2C interface humidity and temperature sensor with low power consumption and excellent long term stability.
The SHT21 is a fully calibrated humidity and temperature sensor offered by Sensirion. It is housed in a reflow‑solderable 3 × 3 mm DFN package with a height of 1.1 mm and provides digital output in true I²C format. The sensor includes a capacitive humidity element, a band‑gap temperature element, an on‑chip ADC, amplifier and OTP memory.
The document details electrical specifications, operating ranges, soldering and handling instructions, as well as the I²C command set for both hold‑master and no‑hold‑master modes. It also lists available evaluation kits and packaging options.
| Resolution (humidity) | 12‑bit, 0.04 %RH |
|---|---|
| Resolution (temperature) | 14‑bit, 0.01 °C |
| Accuracy (humidity) | ±2.0 %RH (typ) |
| Accuracy (temperature) | ±0.3 °C (typ) |
| Package dimensions | 3 × 3 mm footprint, 1.1 mm height |
| Communication interface | Digital 2‑wire I²C |
It offers 12‑bit resolution for humidity (0.04 %RH) and 14‑bit resolution for temperature (0.01 °C).
The sensor is packaged in a 3 × 3 mm DFN footprint with a height of 1.1 mm.
It uses a digital 2‑wire I²C (true I²C) protocol.