I3G4250D Datasheet, PDF (30/43 Pages) STMicroelectronics – 3-axis digital output gyroscope

Register description
7
Register description
I3G4250D
7.1
7.2
The device contains a set of registers which are used to control its behavior and to retrieve
rate data. The register addresses, made up of 7 bits, are used to identify them and to write
the data through the serial interface.
WHO_AM_I (0Fh)
Table 19. WHO_AM_I register
1
1
0
1
0
0
1
1
Device identification register.
CTRL_REG1 (20h)
Table 20. CTRL_REG1 register
DR1
DR0
BW1
BW0
PD
Zen
Yen
Xen
DR1-DR0
BW1-BW0
PD
Zen
Yen
Xen
Table 21. CTRL_REG1 description
Output data rate selection. Refer to Table 22
Bandwidth selection. Refer to Table 22
Power-down mode enable. Default value: 0
(0: power-down mode, 1: normal mode or sleep mode)
Z-axis enable. Default value: 1
(0: Z-axis disabled; 1: Z-axis enabled)
Y-axis enable. Default value: 1
(0: Y-axis disabled; 1: Y-axis enabled)
X-axis enable. Default value: 1
(0: X-axis disabled; 1: X-axis enabled)
DR[1:0] is used to set ODR selection. BW [1:0] is used to set bandwidth selection.
In the following table (Table 22) all frequencies resulting in a combination of DR / BW bits
are given.
DR [1:0]
00
00
00
00
Table 22. DR and BW configuration setting
BW [1:0]
ODR [Hz]
00
100
12.5
01
100
25
10
100
25
11
100
25
Cutoff
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DocID027628 Rev 2