AN3393 datasheet(22/103 Pages) STMICROELECTRONICS

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AN3393

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DocID018750 Rev 4

4.6

OFF_X (10h), OFF_Y (11h), OFF_Z (12h)

Offset compensation register for single axis. Default value is 00h. The value is expressed in

two’s complement.

Final acceleration output value is composed as:

Output(axis) = Measurement(axis) - OFFSET_x(axis) * 32

Where:

–

x = X, Y, Z-axis

–

Measurement(axis) = 16-bit raw data for X, Y, Z

–

OFFSET_x(axis) = Compensation value from OFF_X, OFF_Y, OFF_Z registers

–

OUTPUT(axis) = Acceleration value with offset compensation for output registers

and state machine.

According to the previous formula, the offset on each axis can be compensated from -4095

to 4096 LSB, with steps of 32 LSB.

4.7

CS_X (13h), CS_Y (14h), CS_Z (15h)

Constant shift value register for single axis. This value acts as a temporary offset in DIFF-

Mode for State Machine 2 only (refer to Section 5.4.2). The default value is 00h. The value is

expressed in two’s complement.

4.8

LC_L (16h), LC_H (17h)

16-bit long-counter registers common for both state machines.

Table 11. Offset axis

Bit

Name

OFFx_7

OFFx_6

OFFx_5

OFFx_4

OFFx_3

OFFx_2

OFFx_1

OFFx_0

Default

00000000

Table 12. Constant shift for single axis

Bit

Name

CS_7

CS_6

CS_5

CS_4

CS_3

CS_2

CS_1

CS_0

Default

00000000

Table 13. Status of long counter LSB (16h)

Bit

Name

LC_L_7

LC_L_6

LC_L_5

LC_L_4

LC_L_3

LC_L_2

LC_L_1

LC_L_0

Default

00000001

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