LSM303DLH datasheet(29/47 Pages) STMICROELECTRONICS

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LSM303DLH

Registers description

Doc ID 16941 Rev 1

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Registers description

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

acceleration data. The register address, composed of 7 bits, is used to identify them and to

write the data through the serial interface.

9.1

Linear acceleration register

For linear acceleration sensors, the default (factory) 7-bit slave address is 001100xb.

9.1.1

CTRL_REG1_A (20h)

PM bits allow selection between power-down and two operating active modes. The device is

in power-down mode when the PD bits are set to “000” (default value after boot). Table 20

shows all the possible power mode configurations and respective output data rates. Output

data in the low-power modes are computed with a low-pass filter cut-off frequency defined

by DR1, DR0 bits.

DR bits, in the normal-mode operation, select the data rate at which acceleration samples

are produced. In low-power mode they define the output data resolution. Table 21 shows all

the possible configurations for the DR1 and DR0 bits.

Table 18.

CTRL_REG1_A register

PM2

PM1

PM0

DR1

DR0

Zen

Yen

Xen

Table 19.

CTRL_REG1_A description

PM2 - PM0

Power mode selection. Default value: 000

(000: Power-down; Others: refer to

Table 20)

DR1, DR0

Data rate selection. Default value: 00

(00:50 Hz; others: refer to

Table 21)

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)

Table 20.

Power mode and low-power output data rate configurations

PM2

PM1

PM0

Power mode selection

Output data rate [Hz]

ODRLP

Power-down

Normal mode

ODR

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