LIS35DE datasheet(25/39 Pages) STMICROELECTRONICS

25 / 39 page

LIS35DE

Doc ID 15594 Rev 1

25/39

The device contains a set of registers which are used to control its behavior and to retrieve

acceleration data. The registers address, made of 7 bits, is used to identify them and to

write the data through serial interface.

7.1

CTRL_REG1 (20h)

DR bit allows to select the data rate at which acceleration samples are produced.

The default value is 0 which corresponds to a data-rate of 100Hz. By changing the content

of DR to “1” the selected data-rate will be set equal to 400Hz.

PD bit allows to turn on the turn the device out of power-down mode. The device is in power-

down mode when PD = “0” (default value after boot). The device is in normal mode when PD

is set to 1.

Zen bit enables the generation of Data Ready signal for Z-axis measurement channel when

set to 1. The default value is 1.

Yen bit enables the generation of Data Ready signal for Y-axis measurement channel when

set to 1. The default value is 1.

Xen bit enables the generation of Data Ready signal for X-axis measurement channel when

set to 1. The default value is 1.

Table 17.

CTRL_REG1 (20h) register

0(1)

CTRL_REG1[4:3] value is loaded at boot, ‘0’ value must not be changed.

Zen

Yen

Xen

Table 18.

CTRL_REG1 (20h) register description

Data rate selection. Default value: 0

(0: 100 Hz output data rate; 1: 400 Hz output data rate)

Power Down Control. Default value: 0

(0: power down mode; 1: active mode)

Full Scale selection. Default value: 0

(refer to

Table 2 for typical full scale value)

Zen

Z axis enable. Default value: 1

(0: Z axis disabled; 1: Z axis enabled)

Yen

Y axis enable. Default value: 1

(0: Y axis disabled; 1: Y axis enabled)

Xen

X axis enable. Default value: 1

(0: X axis disabled; 1: X axis enabled)

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