Data Sheet

Datasheet SHT3x-DIS
www.sensirion.com May 2018- Version 5 11/22
break command the sensor abort the ongoing
measurement and enter the single shot mode.
Condition
Hex. code
Repeatability
mps
MSB
LSB
High
0.5
0x20
32
Medium
24
Low
2F
High
1
0x21
30
Medium
26
Low
2D
High
2
0x22
36
Medium
20
Low
2B
High
4
0x23
34
Medium
22
Low
29
High
10
0x27
37
Medium
21
Low
2A
e.g. 0x2130: 1 high repeatability mps - measurement per
second
Table 10 Measurement commands for periodic data
acquisition mode (Clear blocks are controlled by the
microcontroller, grey blocks by the sensor). N.B.: At the
highest mps setting self-heating of the sensor might occur.
4.6 Readout of Measurement Results for
Periodic Mode
Transmission of the measurement data can be initiated
through the fetch data command shown in Table 11. If
no measurement data is present the I2C read header is
responded with a NACK (Bit 9 in Table 11) and the
communication stops. After the read out command fetch
data has been issued, the data memory is cleared, i.e.
no measurement data is present.
Command
Hex code
Fetch Data
0x E0 00
Table 11 Fetch Data command (Clear blocks are controlled
by the microcontroller, grey blocks by the sensor).
4.7 ART Command
The ART (accelerated response time) feature can be
activated by issuing the command in Table 12. After
issuing the ART command the sensor will start acquiring
data with a frequency of 4Hz.
The ART command is structurally similar to any other
command in Table 10. Hence section 4.5 applies for
starting a measurement, section 4.6 for reading out data
and section 4.8 for stopping the periodic data acquisition.
The ART feature can also be evaluated using the
Evaluation Kit EK-H5 from Sensirion.
Command
Hex Code
Periodic Measurement with
ART
0x2B32
Table 12 Command for a periodic data acquisition with
the ART feature (Clear blocks are controlled by the
microcontroller, grey blocks by the sensor).
4.8 Break command / Stop Periodic Data
Acquisition Mode
The periodic data acquisition mode can be stopped using
the break command shown in Table 13. It is
recommended to stop the periodic data acquisition prior
to sending another command (except Fetch Data
command) using the break command. Upon reception of
the break command the sensor will abort the ongoing
measurement and enter the single shot mode. This takes
1ms.
S
ACK
W
I2C Address
1 2 3 4 5 6 7 8 9
ACK
Command MSB
1 2 3 4 5 6 7 8 9
ACK
Command LSB
10 11 12 13 14 15 16 17 18
16-bit command
I2C write header
S
ACK
W
I2C Address
1 2 3 4 5 6 7 8 9
ACK
Command MSB
1 2 3 4 5 6 7 8 9
ACK
Command LSB
10 11 12 13 14 15 16 17 18
16-bit command
I2C write header