SHT3X-DIS datasheet(9/18 Pages) ETC2

9 / 18 page

Datasheet SHT3x-DIS

www.sensirion.com

October 2015 - Version 1

9/18

Condition

Hex. code

Repeatability

mps

MSB

LSB

High

0.5

0x20

Medium

Low

High

0x21

Medium

Low

High

0x22

Medium

Low

High

0x23

Medium

Low

High

0x27

Medium

Low

e.g. 0x2130: 1 high repeatability mps - measurement per

second

Table 9 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 10. If

no measurement data is present the I2C read header is

responded with a NACK (Bit 9 in Table 10) and the

communication stops. The fetch data command will

deliver the same data until a new measurement

updates the humidity and temperature values.

Command

Hex code

Fetch Data

0x E0 00

Table 10 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 11. 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 9. 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 11

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 12. 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 enters the single shot

mode, after finishing the ongoing measurement. This

can take up to 15 ms, depending on the selected

repeatability.

Command

Hex Code

Break

0x3093

Table 12 Break command (Clear blocks are controlled by the

microcontroller, grey blocks by the sensor).

4.9

Reset

A system reset of the SHT3x-DIS can be generated

externally by issuing a command (soft reset) or by

sending a pulse to the dedicated reset pin (nReset pin).

Additionally, a system reset is generated internally

during power-up. During the reset procedure the sensor

will not process commands.

I2C Address

Command MSB

Command LSB

10 11 12 13 14 15 16 17 18

16-bit command

I2C write header

I2C Address

Command MSB

Command LSB

10 11 12 13 14 15 16 17 18

16-bit command

I2C write header

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