HS401x Datasheet

R36DS0023EU0103 Rev.1.03

Jun 6, 2022

Page 18

4.8

Configuration Bits

4.8.1.

Setting the Measurement Resolution

The chip can be configured to perform measurements at different humidity and temperature resolutions by using

the Read and Write Register commands with the appropriate register address. There are four separate

resolution settings for the temperature and humidity measurements, as summarized in Table 9.

Table 9. Temperature and Humidity Measurement Resolution Settings

Setting

Register Address (HEX)

Bits

Description

Resolution for temperature

measurement

0x00

<1:0>

0b00 for 8 bits

0b01 for 10 bits

0b10 for 12 bits

0b11 for 14 bits

Resolution for humidity

measurement

0x00

<3:2>

0b00 for 8 bits

0b01 for 10 bits

0b10 for 12 bits

0b11 for 14 bits

4.8.2.

Periodic Measurement Settings

The registers that are used to activate and configure the periodic measurement settings are shown in Table 10.

Table 10. Periodic Measurement Settings

Setting

Register Address (HEX)

Bits

Description

Activate Periodic

Measurements

0x02

<7>

0b0 when periodic measurements are deactivated

0b1 to activate periodic measurements

Frequency of Periodic

Measurements

0x02

<5:4>

0b00 for a measurement every 0.5s

0b01 for a measurement every 1s

0b10 for a measurement every 2.5s

Table 11. Alert Feature Settings

Setting

Register

Address

(HEX)

Bits

Description

Alert Pin Polarity

0x02

<0>

0b0 Alert pin is active high when triggered

0b1 Alert pin is active low when triggered

Alert Enable Settings

0x03

<3:0>

Enable the Alert feature when thresholds are surpassed as follows:

Bit <0>: RH Low alert enable

Bit <1>: RH High alert enable

Bit <2>: Temperature Low alert enable

Bit <3>: Temperature High alert enable

Setting a bit to 0b1 means this specific alert condition is enabled and

setting a bit to 0b0 means this specific alert condition is disabled.