LSM320HAY30 Datasheet, PDF (32/42 Pages) STMicroelectronics – MEMS motion sensor module: 3D digital accelerometer and 2D pitch and yaw analog gyroscope

Register description
LSM320HAY30
8.6
Table 28.
BDU
BLE
FS1, FS0
STsign
ST
SIM
LA_CTRL_REG4 description
Block data update. Default value: 0
(0: continuous update; 1: output registers not updated between MSB and LSB
reading)
Big/little endian data selection. Default value 0.
(0: data LSB @ lower address; 1: data MSB @ lower address)
Full-scale selection. Default value: 00.
(00: ±2 g; 01: ±4 g; 11: ±8 g)
Self-test sign. Default value: 00.
(0: self-test plus; 1 self-test minus)
Self-test enable. Default value: 0.
(0: self-test disabled; 1: self-test enabled)
SPI serial interface mode selection. Default value: 0.
(0: 4-wire interface; 1: 3-wire interface)
The BDU bit is used to inhibit output register updates between the reading of the upper and
lower register parts. In default mode (BDU = ‘0’), the lower and upper register parts are
updated continuously. If it is not certain to read faster than the output data rate, it is
recommended to set BDU bit to ‘1’. In this way, after the reading of the lower (upper) register
part, the content of that output register is not updated until the upper (lower) part is read
also. This feature avoids reading LSB and MSB related to different samples.
LA_CTRL_REG5 (24h)
Table 29. LA_CTRL_REG5 register
0
0
0
0
0
0
TurnOn1 TurnOn0
Table 30.
TurnOn1,
TurnOn0
LA_CTRL_REG5 description
Turn-on mode selection for sleep-to-wake function. Default value: 00.
TurnOn bits are used for turning on the sleep-to-wake function.
Table 31. Sleep-to-wake configuration
TurnOn1
TurnOn0
Sleep-to-wake status
0
0
Sleep-to-wake function is disabled
1
1
Turned on: The device is in low-power mode (ODR is defined in
LA_CTRL_REG1)
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Doc ID 16917 Rev 1