LIS2DHTR datasheet(17/50 Pages) STMICROELECTRONICS

17 / 50 page

LIS2DH

Mechanical and electrical specifications

Doc ID 022516 Rev 1

17/49

The turn-on time to change from all operating mode is reported into Table 10.: Turn-on time

for operating mode change.

2.6.4

Self-test

Self-test allows the user to check the sensor functionality without moving it. When the self-

test is enabled an actuation force is applied to the sensor, simulating a definite input

acceleration. In this case the sensor outputs will exhibit a change in their DC levels which

are related to the selected full scale through the device sensitivity. When self-test is

activated, the device output level is given by the algebraic sum of the signals produced by

the acceleration acting on the sensor and by the electrostatic test-force. If the output signals

change within the amplitude specified inside Table 3, then the sensor is working properly

and the parameters of the interface chip are within the defined specifications.

Table 10.

Turn-on time for operating mode change

Operating mode change

Turn-on Tim

[ms]

12-bit mode to 8 bit mode

1/ODR

12-bit mode to 10 bit mode

1/ODR

10-bit mode to 8 bit mode

1/ODR

10-bit mode to 12 bit mode

7/ODR

8-bit mode to 10 bit mode

1/ODR

8-bit mode to 12 bit mode

7/ODR

Table 11.

Operating modes current consumption

Operating mode [Hz]

Low power mode

(8 bit data output)

[

μA]

Normal mode

(10 bit data output)

[

μA]

High resolution

(12 bit data output)

[

μA]

100

200

400

1344

185

1620

100

5376

185

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