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参数资料
| 型号： | MMA6556KW |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 18/53页 |
| 文件大小： | 0K |
| 描述： | IC ACCELEROMETER X AXIS 16QFN |
| 标准包装： | 75 |
| 轴： | X |
| 加速范围： | ±120g |
| 灵敏度： | 16 LSB/g |
| 电源电压： | 3.13 V ~ 5.25 V |
| 输出类型： | SPI |
| 接口： | SPI |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-QFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（6x6） |
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Table 16. Arming Count Limit Definitions (Count Mode)
AWS_N[1]
Don’t Care
Don’t Care
Don’t Care
Don’t Care
AWS_N[0]
Don’t Care
Don’t Care
Don’t Care
Don’t Care
AWS_P[1]
0
0
1
1
AWS_P[0]
0
1
0
1
Sample Count Limit
1
3
7
15
3.1.10
Arming Threshold Registers (ARMT_P, ARMT_N)
The arming threshold registers contain the positive and negative thresholds to be used by the arming function. Refer to
Section 3.8.10 for more details regarding the arming function.
The arming threshold registers can be written during initialization but are locked once the ENDINIT bit is set. Refer to
Section 3.1.6.3 . The arming threshold registers are included in the writable register CRC check. Refer to Section 3.2.2 for details.
Table 17. Arming Threshold Registers
Location
Bit
Address
$10
$12
Register
ARMT_P
ARMT_N
7
AT_P[7]
AT_N[7]
6
AT_P[6]
AT_N[6]
5
AT_P[5]
AT_N[5]
4
AT_P[4]
AT_N[4]
3
AT_P[3]
AT_N[3]
2
AT_P[2]
AT_N[2]
1
AT_P[1]
AT_N[1]
0
AT_P[0]
AT_N[0]
Reset Value
0
0
0
0
0
0
0
0
The values programmed into the threshold registers are the threshold values used for the arming function as described in
Section 3.8.10 . The threshold registers hold independent unsigned 8-bit values for each axis and polarity. Each threshold incre-
ment is equivalent to one output LSB. Table 18 shows examples of some threshold register values and the corresponding thresh-
old.
Table 18. Threshold Register Value Examples
Axis Type
Programmed Thresholds
Positive Threshold
Negative Threshold
Range
(g)
105.5
105.5
105.5
105.5
Sensitivity
(LSB/g)
18.2
18.2
18.2
18.2
Positive
(Decimal)
100
255
50
150
Negative
(Decimal)
50
0
20
75
(g)
5.50
14.0
2.75
8.24
(g)
-2.75
Disabled
-1.10
-4.12
If either the positive or negative threshold is programmed to $00, comparisons are disabled for only that polarity. The arming
function still operates for the opposite polarity. If both the positive and negative arming thresholds are programmed to $00, the
Arming function is disabled, and the output pin is disabled, regardless of the value of the A_CFG bits in the DEVCFG register.
MMA655x
Sensor
18
Freescale Semiconductor, Inc.
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| MMA6556KWR2 | 功能描述:加速计 - 板上安装 X-AXIS 120G RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C |
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