HS401x Datasheet

R36DS0023EU0103 Rev.1.03

Jun 6, 2022

Page 12

4.4.2.

Performing a No-Hold Measurement

A no-hold measurement sequence consists of the following steps, as illustrated in Figure 15.

1.

a measurement by sending the desired no-hold measurement command.

2.

read bit. If the measurement is completed and the result is ready, the chip will send an ACK bit and starts to

send the result over the bus. If the measurement is still in progress, the chip will send a NACK bit and the

master will need to try to read the result again.

Figure 15. Typical No-Hold Measurement Sequence for a Humidity and Temperature Command

4.4.3.

Calculating Humidity and Temperature Output

As stated in Table 5, the measurement data can either be two or four bytes long depending on whether a

temperature measurement or a humidity and temperature measurement was initiated. The most significant bit of

the reading is sent first followed by the least significant bits. The humidity and temperature measurements are

always scaled up to a 14-bit value regardless of the selected resolution of the sensor. The relative humidity (in

percent) and the temperature (in degrees Celsius) are obtained as follows:

The relative humidity (in percent) and the temperature (in degrees Celsius) are calculated with Equation 1 and

Equation 2, respectively.

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Equation 1

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Equation 2