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参数资料
| 型号： | MMA5224W |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 31/58页 |
| 文件大小： | 0K |
| 描述： | IC ACCELER 240G X-AXIS 16QFN |
| 标准包装： | 75 |
| 轴： | X |
| 加速范围： | ±240g |
| 灵敏度： | 8LSB/g，4LSB/g，2LSB/g，1LSB/g |
| 电源电压： | 4.2 V ~ 17 V |
| 输出类型： | 数字 |
| 带宽： | 400Hz |
| 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（6x6） |
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3.5.3.4
Offset Monitor
The device includes an offset monitor circuit. The output of the single pole low-pass filter in the offset cancellation block is
continuously monitored against the offset limits specified in Section 2.4 . An up/down counter is employed to count up If the output
exceeds the limits, and to count down if the output is within the limits. The output of the counter is compared against the count
limit OFFMON CNTLIMIT . If the counter exceeds the limit, the OFF_B flag in the SC register is cleared. The counter rails once the
max counter value is reached (OFFMON CNTSIZE ). The offset monitor is disabled during Initialization Phase 1, Phase 2, and
Phase 3.
3.5.3.5
Data Interpolation
The device includes 16 to 1 linear data interpolation to minimize the system sample jitter. Each result produced by the digital
signal processing chain is delayed one sample time. On detection of a sync pulse the transmitted data is interpolated from the
two previous samples, resulting in a latency of one sample time, and a maximum signal jitter of ±1/16 of a sample time. Reference
Section 4.5 for more information regarding interpolation and data latency.
3.5.3.6
Output Scaling
The 26-bit digital output from the DSP is clipped and scaled to a 10-bit or 8-bit word which spans the acceleration range of the
device. Figure 22 shows the method used to establish the output acceleration data word from the 26-bit DSP output.
Over Range
Signal
Noise
Margin
D25
D24
D23
D22
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
D11
D10
D9
D8
...
D2
D1
D0
8-bit Data Word
D21
D20
D19
D18
D17
D16
D15
D14
Using Rounding
10-bit Data Word
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
Using Rounding
Figure 22. 10-Bit Output Scaling Diagram
3.5.3.7
PCM Output Function
The device provides the option for a PCM output function. The PCM output is activated if the PCM bit is set in the DEVCFG2
register. When the PCM function is enabled, a 4 MHz Pulse Code Modulated signal proportional to the upper 9 bits of the 10-bit
acceleration response is output onto the PCM pin. The PCM output is intended for test use only.
D[21:13]
Output Scaling
9
A
CARRY
PCM
D FF Q Q
FF Q
FF
FF
FF
Q Q
CLK
Q Q
CLK
Q Q
CLK
Q Q
CLK
Section 3.5.3.6
Sample updated every 16 μ S
9 Bit ADDER
B SUM
f CLK = 4 MHz
9
9
D D Q Q
D D Q Q
D D Q Q
FF
FF
FF
CLK FF
CLK
CLK
CLK
CLK Q
Figure 23. PCM Output Function Block Diagram
MMA52xxKW
Sensors
Freescale Semiconductor, Inc.
31
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相关代理商/技术参数 |
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| MMA5224WR2 | 功能描述:加速计 - 板上安装 X-AXIS 240G 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 |
| MMA5248AKW | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Xtrinsic MMA52xxAKW PSI5 Inertial Sensor |
| MMA5248AKWR2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Xtrinsic MMA52xxAKW PSI5 Inertial Sensor |
| MMA5248KW | 功能描述:加速计 - 板上安装 X-LATERAL 480G 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 |
| MMA5248KWR2 | 功能描述:加速计 - 板上安装 X-LATERAL RANGE 480G 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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