STS30 datasheet(8/17 Pages) ETC2

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November 2016 - Version 1

8/17

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 8 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 9. If no

measurement data is present the I2C read header is

responded with a NACK (Bit 9 in Table 9) 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 9 Fetch Data command (Clear blocks are controlled

by the microcontroller, grey blocks by the sensor)

4.7

Break command / Stop Periodic Data

Acquisition Mode

The periodic data acquisition mode can be stopped using

the break command shown in Table 10. 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 10 Break command (Clear blocks are controlled by

the microcontroller, grey blocks by the sensor).

4.8

Reset

A system reset of the STS3x-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.

In order to achieve a full reset of the sensor without

removing the power supply, it is recommended to use the

nRESET pin of the STS3x-DIS.

Interface Reset

If communication with the device is lost, the following

signal sequence will reset the serial interface: While

leaving SDA high, toggle SCL nine or more times. This

must be followed by a Transmission Start sequence

preceding the next command. This sequence resets the

interface only. The status register preserves its content.

Soft Reset / Re-Initialization

The STS3x-DIS provides a soft reset mechanism that

forces the system into a well-defined state without

removing the power supply. When the system is in idle

state the soft reset command can be sent to the STS3x-

DIS. This triggers the sensor to reset its system

controller and reloads calibration data from the memory.

In order to start the soft reset procedure the command

as shown in Table 11 should be sent.

It is worth noting that the sensor reloads calibration data

prior to every measurement by default.

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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