参数资料
型号: MMA6556KW
厂商: Freescale Semiconductor
文件页数: 35/53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)
The effect of this interpolation at the system level is a 50% reduction in sample jitter. Figure 24 shows the resulting output data
for an input signal.
80
75
Internally
Sampled Values
70
65
60
55
Earliest Transmission
Point of Interpolated
Values
Earliest Transmission
Fixed Latency:
t S / 2
Point of Internally
Sampled Values
50
45
40
Window of
Transmission for
Interpolated Values
(Maximum: t S / 2)
Window of
Transmission for
= Signal Jitter = Sampled Values
(Maximum: t S / 2)
0
5
10
15
20
25
30
35
40
Input Signal
Time
Internally Sampled Signal
Interpolated Samples
Figure 24. Data Interpolation Example
3.8.9
Acceleration Data Timing
The SPI uses a request/response protocol, where a SPI transfer is completed through a sequence of 2 phases. Reference
Section 4 for more details regarding the SPI protocol. The device latches the associated data for an acceleration request at the
rising edge of CS. The most recent sample available from the DSP (including interpolation) is latched, and transmitted during the
subsequent SPI transfer.
SCLK
CS
MOSI
Request Accel
Request Accel
Accel Response
Request Accel
Accel Response
Request Accel
Accel Response
MISO
Axis Data Latched
Arm Function updated
Data Latched
Arm Function updated if applicable
Figure 25. Acceleration Data Timing
MMA655x
Sensor
Freescale Semiconductor, Inc.
35
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