LSM303DLHTR Datasheet, PDF (33/47 Pages) STMicroelectronics – Sensor module: 3-axis accelerometer and 3-axis magnetometer

LSM303DLH
Registers description
9.1.5
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 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.
CTRL_REG5_A (24h)
Table 31. CTRL_REG5_A register
0
0
0
0
0
0
TurnOn1 TurnOn0
Obsolete ^{Product(s) - Obsolete Product(s) 9.1.6}
Table 32.
TurnOn1,
TurnOn0
CTRL_REG5_A 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 33. Sleep-to-wake configuration
TurnOn1
TurnOn0
Sleep-to-wake status
0
0
Sleep-to-wake function is disabled
Turned on: The device is in low-power mode
1
1
(ODR is defined in CTRL_REG1_A)
By setting the TurnOn [1:0] bits to 11, the “sleep-to-wake” function is enabled. When an
interrupt event occurs, the device goes into normal mode, increasing the ODR to the value
defined in CTRL_REG1_A. Although the device is in normal mode, CTRL_REG1_A content
is not automatically changed to “normal mode” configuration.
HP_FILTER_RESET_A (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 surmount the settling time of the high-pass filter.
9.1.7 REFERENCE_A (26h)
Table 34. REFERENCE_A register
Ref7
Ref6
Ref5
Ref4
Ref3
Ref2
Ref1
Ref0
Table 35. REFERENCE_A description
Ref7 - Ref0 Reference value for high-pass filter. Default value: 00h.
Doc ID 16941 Rev 1
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