Environment - SI7021/HTU21D

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Plugin details

Type: Environment

Name: SI7021/HTU21D

Status: NORMAL CLIMATE

GitHub: P014_SI70xx.ino

Maintainer: .

Used libraries: .

Supported hardware

SI7013:

Has support for humidity, temperature and ADC values

  • ± 3% RH (max), 0–80% RH (0 to 100% RH operating range)

  • ±0.4 °C (max), –10 to 85 °C (–40 to +125 °C operating range)

  • Operating Voltage (1.9 to 3.6 V)

  • Low Power Consumption: 150 μA active current ; 60 nA standby current

  • Analog To Digital converter builtin.

Datasheet: <https://www.silabs.com/sensors/humidity/si7006-13-20-21-34/device.si7013-a20-gm1> Direct link: <https://www.silabs.com/documents/public/data-sheets/Si7013-A20.pdf>

If using the SI7013 to measure ADC make sure you implement one of the two thermistor (thermistor can we replaced with LRD for light level measurements) circuit diagrams:
  • Figure 5. Typical Application Circuit for Thermistor Interface with AD0 = 1

  • Figure 6. Typical Application Circuit for Thermistor Interface with AD0 = 0

Do not use the single ended circuit as the Vout is connected directly to ground:
  • Figure 7. Typical Application Circuit for Single Ended 0 to 3 V Measurement (!DO NOT USE THIS CIRCUIT!)

SI7020 and SI7021:

  • Si7020: ± 4% RH (max), 0–80% RH (0 to 100% RH operating range)

  • Si7021: ± 3% RH (max), 0–80% RH (0 to 100% RH operating range)

  • ±0.4 °C (max), –10 to 85 °C (–40 to +125 °C operating range)

  • Operating voltage (1.9 to 3.6 V)

  • Low Power Consumption: 150 µA active current ; 60 nA standby current

  • No ADC builtin.

Note: The plugin reads the CHIP ID to determine if the ADC is available. This Plugin is NOT compatible with SHT20, for SHT2x devices use Plugin 122.

HTU21D devices while using the same reading protocol do not have a CHIP ID capability and not able to detect them.

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Change log

Changed in version 3.0:

added Another major overhaul and currently supporting: SI7013,SI7020,SI7021

Changed in version 2.0:

added Major overhaul for 2.0 release.

New in version 1.0:

added Initial release version.