LIS2DH datasheet(19/50 Pages) STMICROELECTRONICS

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LIS2DH

Mechanical and electrical specifications

Doc ID 022516 Rev 1

19/49

The LIS2DH may also be configured to generate an inertial Wake-Up and Free-Fall interrupt

signal accordingly to a programmed acceleration event along the enabled axes. Both Free-

Fall and Wake-Up can be available simultaneously on two different pins.

2.9

Factory calibration

The IC interface is factory calibrated for sensitivity (So) and Zero-g level (TyOff).

The trimming values are stored inside the device in a non volatile memory. Any time the

device is turned on, the trimming parameters are downloaded into the registers to be used

during the active operation. This allows to use the device without further calibration.

2.10

FIFO

The LIS2DH contains a 10 bit, 32-level FIFO. Buffered output allows 4 operation modes:

FIFO, stream, trigger and FIFO ByPass. Where FIFO bypass mode is activated FIFO is not

operating and remains empty. In FIFO mode, data from acceleration detection on x, y, and z-

axes measurements are stored in FIFO.

2.11

Temperature sensor

The LIS2DH is supplied with an internal temperature sensor. Temperature data can be

enabled by setting the TEMP_EN bit of the TEMP_CFG_REG register to 1.

To retrieve the temperature sensor data BDU bit on CTRL_REG4 (23h) must be set to ‘1’.

Both OUT_TEMP_H and OUT_TEMP_L registers must be read.

Temperature data is stored inside OUT_TEMP_H as 2’s complement data in 8 bit format left

justified.

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