参数资料
型号: MMA8452QR1
厂商: Freescale Semiconductor
文件页数: 31/47页
文件大小: 0K
描述: IC ACCELER 2G/4G/8G 3AXIS 16QFN
标准包装: 1
系列: MMA
轴: X,Y,Z
加速范围: ±2g,4g,8g
灵敏度: 1024 计数/g,512 计数/g,256 计数/g
电源电压: 1.95 V ~ 3.6 V
输出类型: 数字
带宽: 800Hz
接口: I²C
安装类型: 表面贴装
封装/外壳: 16-VFQFN
供应商设备封装: 16-QFN(3x3)
其它名称: MMA8452QR1DKR
0x1F: TRANSIENT_THS Register
The Transient Threshold register sets the threshold limit for the detection of the transient acceleration. The value in the
TRANSIENT_THS register corresponds to a g value which is compared against the values of High-Pass Filtered Data. If the High-
Pass Filtered acceleration value exceeds the threshold limit, an event flag is raised and the interrupt is generated if enabled.
0x1F: TRANSIENT_THS Register (Read/Write)
Bit 7
DBCNTM
Bit 6
THS6
Bit 5
THS5
Bit 4
THS4
Bit 3
THS3
Bit 2
THS2
Bit 1
THS1
Bit 0
THS0
Table 33. TRANSIENT_THS Description
DBCNTM
THS[6:0]
Debounce counter mode selection. Default value: 0. 0: increments or decrements debounce; 1: increments or clears counter.
Transient Threshold: Default value: 000_0000.
The threshold THS[6:0] is a 7-bit unsigned number, 0.063g/LSB. The maximum threshold is 8g. Even if the part is set to full
scale at 2g or 4g this function will still operate up to 8g. If the Low-Noise bit is set in Register 0x2A, the maximum threshold to be
reached is 4g.
Note: If configuring the transient detection threshold for less than 1g, the high-pass filter will need some settling time. The settling
time will vary depending on selected ODR, high-pass frequency cutoff and threshold. For more information, please refer to
Freescale application note, AN4071.
0x20: TRANSIENT_COUNT
The TRANSIENT_COUNT sets the minimum number of debounce counts continuously matching the condition where the
unsigned value of high-pass filtered data is greater than the user specified value of TRANSIENT_THS.
0x20: TRANSIENT_COUNT Register (Read/Write)
Bit 7
D7
Bit 6
D6
Bit 5
D5
Bit 4
D4
Bit 3
D3
Bit 2
D2
Bit 1
D1
Bit 0
D0
Table 34. TRANSIENT_COUNT Description
D[7:0]
Count value. Default value: 0000_0000.
The time step for the transient detection debounce counter is set by the value of the system ODR and the Oversampling mode.
Table 35. TRANSIENT_COUNT Relationship with the ODR
ODR (Hz)
Normal
Max Time Range (s)
LPLN HighRes
LP
Normal
Time Step (ms)
LPLN HighRes
LP
800
400
200
100
50
12.5
6.25
1.56
0.319
0.638
1.28
2.55
5.1
5.1
5.1
5.1
0.319
0.638
1.28
2.55
5.1
20.4
20.4
20.4
0.319
0.638
0.638
0.638
0.638
0.638
0.638
0.638
0.319
0.638
1.28
2.55
5.1
20.4
40.8
40.8
1.25
2.5
5
10
20
20
20
20
1.25
2.5
5
10
20
80
80
80
1.25
2.5
2.5
2.5
2.5
2.5
2.5
2.5
1.25
2.5
5
10
20
80
160
160
MMA8452Q
Sensors
Freescale Semiconductor, Inc.
31
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