HS401x Datasheet

R36DS0023EU0104 Rev.1.04

Mar 14, 2023

Page 11

Figure 9. Typical Hold Measurement Sequence for a Humidity and Temperature Command

4.4.2.

Performing a No-Hold Measurement

A no-hold measurement sequence consists of the following steps, as illustrated in Figure 10.

1.

Wake up the HS401x series sensor from sleep mode by sending its I2C address with a write bit and initiate a

measurement by sending the desired no-hold measurement command.

2.

To read the result from the HS401x series sensor, the master has to send the chip its I2C address and a

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.