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MMA6525KW датащи(PDF) 36 Page - Freescale Semiconductor, Inc

номер детали MMA6525KW
подробное описание детали  Dual-Axis SPI Inertial Sensor
PDF  56 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
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MMA6525KW датащи(HTML) 36 Page - Freescale Semiconductor, Inc

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Sensor
36
Freescale Semiconductor, Inc.
MMA65xx
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.
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.
Figure 25. Acceleration Data Timing
40
45
50
55
60
65
70
75
80
0
5
10
15
20
25
30
35
40
Time
Input Signal
Internally Sampled Signal
Interpolated Samples
Internally
Sampled Values
Earliest Transmission
Point of Interpolated
Values
Earliest Transmission
Point of Internally
Sampled Values
Window of
Transmission for
Sampled Values
(Maximum: tS / 2)
Window of
Transmission for
Interpolated Values
(Maximum: tS / 2)
Fixed Latency:
tS / 2
= Signal Jitter =
SCLK
MOSI
MISO
CS
Request X-Axis
Request Y-Axis
X-Axis Response
Y-Axis Response
Request X-Axis
Request Y-Axis
X-Axis Response
X-Axis Data Latched
Y-Axis Data Latched
X-Axis Arm Function updated
Y-Axis Arm Function updated if applicable



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