AN4650 datasheet(96/102 Pages) STMICROELECTRONICS

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Temperature sensor

AN4650

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DocID027415 Rev 1

Temperature sensor

The LSM6DS3 is provided with an internal temperature sensor that is suitable for ambient

temperature measurement.

If both the accelerometer and the gyroscope sensors are in Power-Down mode, the

temperature sensor is off.

The maximum output data rate of temperature sensor is 52 Hz and its value depends on

how the accelerometer and gyroscope sensors are configured:



If the gyroscope is in Power-Down mode:

–

the temperature data rate is equal to 13 Hz if the accelerometer ODR is equal to

13 Hz (in both Low-Power and High-Performance mode);

–

the temperature data rate is equal to 26 Hz if the accelerometer configuration is

26 Hz Low-Power mode;

–

the temperature data rate is equal to 52H z for all other accelerometer

configurations.



If the accelerometer is in Power-Down mode:

–

the temperature data rate is equal to 13 Hz if the gyroscope configuration is

13 Hz Low-Power mode;

–

the temperature data rate is equal to 2 Hz if the gyroscope configuration is 26 Hz

Low-Power mode;

–

the temperature data rate is equal to 52 Hz for all other gyroscope configurations.



In combo mode:

–

if the gyroscope is configured in High-Performance mode, the temperature data

rate is equal to 52 Hz regardless of the gyroscope ODR and the accelerometer

configuration;

–

if the gyroscope is configured in Low-Power / Normal mode, the temperature data

rate is equal to the maximum value between the accelerometer ODR and

gyroscope ODR, while remaining below the 52 Hz value.

For the temperature sensor, the data-ready signal is represented by the TDA bit of the

STATUS_REG register. The signal can be driven to the INT2 pin by setting to 1 the

INT2_DRDY_TEMP bit of the INT2_CTRL register.

The temperature data is given by the concatenation of the OUT_TEMP_H and

OUT_TEMP_L registers and it is represented as a number of 16 bits in two’s complement

format, with a sensitivity of +16 LSB/°C. The output zero level corresponds to 25 °C.

The LSM6DS3 allows swapping, by setting the BLE bit of the CTRL3_C register set to 1, the

content of the lower and the upper part of the temperature output data registers (i.e.

OUT_TEMP_H with OUT_TEMP_L) .

Temperature sensor data can also be stored in FIFO with a configurable decimation factor

(see Section 8.9 for details).

AN4650 Datasheet(PDF) 96 Page - STMicroelectronics

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