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参数资料
| 型号： | LIS35DE |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA14 |
| 封装： | 3 X 5 MM, 0.92 MM HEIGHT, 0.80 MM PITCH, GREEN, PLASTIC, LGA-14 |
| 文件页数： | 19/39页 |
| 文件大小： | 650K |
| 代理商： | LIS35DE |
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Register description
LIS35DE
26/39
Doc ID 15594 Rev 1
7.2
CTRL_REG2 (21h)
SIM bit selects the SPI serial interface mode. When SIM is ‘0’ (default value) the 4-wire
interface mode is selected. The data coming from the device are sent to SDO pad. In 3-wire
interface mode output data are sent to SDA_SDI pad.
BOOT bit is used to refresh the content of internal registers stored in the flash memory
block. At the device power up the content of the flash memory block is transferred to the
internal registers related to trimming functions to permit a good behavior of the device itself.
If for any reason the content of trimming registers is changed it is sufficient to use this bit to
restore correct values. When BOOT bit is set to ‘1’ the content of internal flash is copied
inside corresponding internal registers and it is used to calibrate the device. These values
are factory trimmed and they are different for every accelerometer. They permit a good
behavior of the device and normally they have not to be changed. At the end of the boot
process the BOOT bit is set again to ‘0’.
FDS bit enables (FDS=1) or bypass (FDS=0) the high pass filter in the signal chain of the
sensor
HP_coeff[2:1]. These bits are used to configure high-pass filter cut-off frequency ft.
Table 19.
CTRL_REG2 (21h) register
SIM
BOOT
--
FDS
HP_FF_
WU2
HP_FF_
WU1
HP_coeff2
HP_coeff1
Table 20.
CTRL_REG2 (21h) register description
SIM
SPI Serial Interface Mode selection. Default value: 0
(0: 4-wire interface; 1: 3-wire interface)
BOOT
Reboot memory content. Default value: 0
(0: normal mode; 1: reboot memory content)
FDS
Filtered Data Selection. Default value: 0
(0: internal filter bypassed; 1: data from internal filter sent to output register)
HP FF_WU2
High Pass filter enabled for FreeFall/WakeUp # 2. Default value: 0
(0: filter bypassed; 1: filter enabled)
HP_FF_WU1
High Pass filter enabled for Free-Fall/Wake-Up #1. Default value: 0
(0: filter bypassed; 1: filter enabled)
HP_coeff2
HP_coeff1
High pass filter cut-off frequency configuration. Default value: 00
(See table below)
Table 21.
High pass filter cut-off frequency configuration
HP_coeff2,1
ft (Hz)
(DR=100 Hz)
ft (Hz)
(DR=400 Hz)
00
2
8
01
1
4
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