LIS331DL datasheet(26/42 Pages) STMICROELECTRONICS

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LIS331DL

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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

WHO_AM_I (0Fh)

Device identification register.

This register contains the device identifier that for LIS331DL is set to 3Bh.

7.2

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 100 Hz. By changing the content of

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

PD bit allows to 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’.

STP, STM bits are used to activate the self test function. When the bit is set to one, an

output change will occur to the device outputs (refer to Table 3 and 4 for specifications) thus

allowing to check the functionality of the whole measurement chain.

Table 16.

WHO_AM_I register

011

Table 17.

CTRL_REG1 register

STP

STM

Zen

Yen

Xen

Table 18.

CTRL_REG1 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 3 for typical full scale values)

STP, STM

Self Test Enable. Default value: 0

(0: normal mode; 1: self test P, M enabled)

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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