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6.7
Control Registers
Note: Except for STANDBY mode selection, the device must be in STANDBY mode to change any of the fields within
CTRL_REG1 (0x2A).
0x2A: CTRL_REG1 System Control 1 Register
0x2A CTRL_REG1 Register (Read/Write)
Bit 7
ASLP_RATE1
Bit 6
ASLP_RATE0
Bit 5
DR2
Bit 4
DR1
Bit 3
DR0
Bit 2
LNOISE
Bit 1
F_READ
Bit 0
ACTIVE
Table 54. CTRL_REG1 Description
ASLP_RATE[1:0]
DR[2:0]
LNOISE
F_READ
ACTIVE
Configures the Auto-WAKE sample frequency when the device is in SLEEP Mode. Default value: 00.
See Table 55 for more information.
Data rate selection. Default value: 000.
See Table 56 for more information.
Reduced noise reduced Maximum range mode. Default value: 0.
(0: Normal mode; 1: Reduced Noise mode)
Fast Read mode: Data format limited to single Byte Default value: 0.
(0: Normal mode 1: Fast Read Mode)
Full Scale selection. Default value: 00.
(0: STANDBY mode; 1: ACTIVE mode)
Table 55. SLEEP Mode Rate Description
ASLP_RATE1
0
0
1
1
ASLP_RATE0
0
1
0
1
Frequency (Hz)
50
12.5
6.25
1.56
It is important to note that when the device is Auto-SLEEP mode, the system ODR and the data rate for all the system
functional blocks are overridden by the data rate set by the ASLP_RATE field.
DR[2:0] bits select the Output Data Rate (ODR) for acceleration samples. The default value is 000 for a data rate of 800 Hz.
Table 56. System Output Data Rate Selection
DR2
0
0
0
0
1
1
1
1
DR1
0
0
1
1
0
0
1
1
DR0
0
1
0
1
0
1
0
1
ODR
800 Hz
400 Hz
200 Hz
100 Hz
50 Hz
12.5 Hz
6.25 Hz
1.56 Hz
Period
1.25 ms
2.5 ms
5 ms
10 ms
20 ms
80 ms
160 ms
640 ms
ACTIVE bit selects between STANDBY mode and ACTIVE mode. The default value is 0 for STANDBY mode.
Table 57. Full Scale Selection
Active
0
1
Mode
STANDBY
ACTIVE
LNOISE bit selects between normal full dynamic range mode and a high sensitivity, Low Noise mode. In Low Noise mode, the
maximum signal that can be measured is ±4g. Note: Any thresholds set above 4g will not be reached.
F_READ bit selects between Normal and Fast Read mode. When selected, the auto increment counter will skip over the LSB
data bytes.
MMA8453Q
Sensors
Freescale Semiconductor, Inc.
37
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