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AN2335 Datasheet(PDF) 18 Page - STMicroelectronics

Part # AN2335
Description  This document is intended to give application
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2335 Datasheet(HTML) 18 Page - STMicroelectronics

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About control registers
AN2335
18/40
6
About control registers
6.1
CTRL_REG1 (20h)
Control register #1.
DR bit allows to select the data rate at which acceleration samples are produced. The
default value is 0 which corresponds to a data-rate of 100Hz. By changing the content of DR
to 1 the selected data-rate will be set equal to 400Hz.
PD bit allows to turn the device out of power-down mode. The device is in power-down mode
when PD= “0” (default value after boot). The device is in normal mode when PD is set to 1.
STP, STM bits are used to activate the self test function. When one of the bit is set to 1, an
output change will occur to the device outputs (refer to datasheet for specification) thus
allowing to check the functionality of the whole measurement chain. STP and STM move the
output in opposite directions.
Zen bit enables the generation of DataReady signal for Z-axis measurement channel when
set to 1. The default value is 1.
Yen bit enables the generation of DataReady signal for Y-axis measurement channel when
set to 1. The default value is 1.
Xen bit enables the generation of DataReady signal for X-axis measurement channel when
set to 1. The default value is 1.
DR
PD
FS
ST P
ST M
Zen
Yen
Xen
DR
Data rate selection. Default value: 0
(0: 100 Hz output data rate; 1: 400 Hz output data rate)
PD
Power Down Control. Default value: 0
(0: power down mode; 1: active mode)
FS
Full Scale selection. Default value: 0
(0: +/- 2g; 1: +/- 8g)
STP, STM
Self Test Enable. Default value: 00
(00: normal mode; 10: self test P; 01 self test M; 11: forbidden)
Zen
Z axis enable. Default value: 1
(0: Z axis disabled; 1: Z axis enabled)
Yen
Y axis enable. Default value: 1
(0: Y axis disabled; 1: Y axis enabled)
Xen
X axis enable. Default value: 1
(0: X axis disabled; 1: X axis enabled)
DR (DataRate)
PD (PowerDown)
Status
0
0
Power Down (Default)
0
1
Active (100Hz output)
1
0
Power Down
1
1
Active (400Hz output)



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