IIS328DQ datasheet(28/40 Pages) STMICROELECTRONICS

Teilenummer	IIS328DQ

Bauteilbeschribung	High-performance ultra-low-power 3-axis accelerometer with digital output for industrial applications

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Register description

IIS328DQ

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DocID027250 Rev 3

The BDU bit is used to inhibit the output register update until both upper and lower register

parts are read. In default mode (BDU = ‘0’), the lower and upper register parts are updated

continuously. When the BDU is activated (BDU = 1), the content of the output registers is

not updated until both MSb and LSb are read which avoids reading values related to

different sample times.

7.6

CTRL_REG5 (24h)

The TurnOn bits are used for turning on the sleep-to-wake function.

By setting TurnOn[1:0] bits to 11, the “sleep-to-wake” function is enabled. When an interrupt

event occurs, the device is switched to normal mode, increasing the ODR to the value

defined in CTRL_REG1. Although the device is in normal mode, the CTRL_REG1 content is

not automatically changed to “normal mode” configuration.

7.7

HP_FILTER_RESET (25h)

Dummy register. Reading at this address instantaneously zeroes the content of the internal

high-pass filter. If the high-pass filter is enabled, all three axes are instantaneously set to

0 g. This makes it possible to nullify the settling time of the high-pass filter.

7.8

REFERENCE (26h)

This register sets the acceleration value taken as a reference for the high-pass filter output.

Table 30. CTRL_REG5 register

0

TurnOn1

TurnOn0

Table 31. CTRL_REG5 description

TurnOn1,

TurnOn0

Turn-on mode selection for sleep-to-wake function. Default value: 00

Table 32. Sleep-to-wake configuration

TurnOn1 TurnOn0

Sleep-to-wake status

0

Sleep-to-wake function is disabled

1

Turned on: the device is in low-power mode (ODR is defined in CTRL_REG1)

Table 33. REFERENCE register

Ref7

Ref6

Ref5

Ref4

Ref3

Ref2

Ref1

Ref0

Table 34. REFERENCE description

Ref7 - Ref0

Reference value for high-pass filter. Default value: 00h

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