| Datasheet: Publicly available at the Sensirion website |
| https://www.sensirion.com/file/datasheet_sht21 |
| Datasheet: Publicly available at the Sensirion website |
| https://www.sensirion.com/file/datasheet_sht25 |
| Urs Fleisch <urs.fleisch@sensirion.com> |
| The SHT21 and SHT25 are humidity and temperature sensors in a DFN package of |
| only 3 x 3 mm footprint and 1.1 mm height. The difference between the two |
| devices is the higher level of precision of the SHT25 (1.8% relative humidity, |
| 0.2 degree Celsius) compared with the SHT21 (2.0% relative humidity, |
| The devices communicate with the I2C protocol. All sensors are set to the same |
| I2C address 0x40, so an entry with I2C_BOARD_INFO("sht21", 0x40) can be used |
| - Electronic Identification Code |
| The driver uses the default resolution settings of 12 bit for humidity and 14 |
| bit for temperature, which results in typical measurement times of 22 ms for |
| humidity and 66 ms for temperature. To keep self heating below 0.1 degree |
| Celsius, the device should not be active for more than 10% of the time, |
| e.g. maximum two measurements per second at the given resolution. |
| Different resolutions, the on-chip heater, and using the CRC checksum |