AN2960 datasheet(19/41 Pages) STMICROELECTRONICS

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AN2960

About control registers

Doc ID 15557 Rev 1

19/41

About control registers

6.1

CTRL_REG1 (20h)

Control register #1.

The DR bit allows the selection of the data rate at which acceleration samples are produced.

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

of DR to 1, the selected data rate is set equal to 400 Hz.

The PD bit allows the device to exit 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.

The STP and STM bits are used to activate the self-test function. When one of the bits is set

to 1, a change to the device outputs occurs (refer to datasheet for specification), allowing

checking of the functionality of the whole measurement chain. STP and STM move the

output in opposite directions.

The Zen bit enables the generation of a DataReady signal for the Z-axis measurement

channel when set to 1. The default value is 1.

The Yen bit enables the generation of a DataReady signal for the Y-axis measurement

channel when set to 1. The default value is 1.

The Xen bit enables the generation of a DataReady signal for the X-axis measurement

channel when set to 1. The default value is 1.

ST P

ST M

Zen

Yen

Xen

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

(0: +/- 2 g; 1: +/- 8 g)

STP, STM

Self test enable. Default value: 00

(00: normal mode; 10: self test P; 01 self test M; 11: forbidden)

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)

DR (Data rate)

PD (Power-down)

Status

Power-down (default)

Active (100 Hz output)

Power-down

Active (400 Hz output)

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