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MMA6525KW 数据表(PDF) 41 Page - Freescale Semiconductor, Inc

部件名 MMA6525KW
功能描述  Dual-Axis SPI Inertial Sensor
PDF  56 Pages
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MMA6525KW 数据表(HTML) 41 Page - Freescale Semiconductor, Inc

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Sensor
Freescale Semiconductor, Inc.
41
MMA65xx
3.8.11
PCM Output Function
The device provides the option for a PCM output function. The PCM output is enabled by setting the A_CFG bits in the
DEVCFG register to the appropriate state as described in Section 3.1.6.6. Selecting the PCM output enables the following func-
tions:
•
The PCM_X and PCM_Y pins are programmed as a digital outputs. Reference Section 2.3 for the pin electrical
parameters.
•
The acceleration value output from the offset cancellation block is saturated to 9-bits and converted to an unsigned value.
Note, the 9-bit unsigned acceleration value uses the full range of values (0 - 511).
•
The 9-bit acceleration value is input into a summer clocked at 8MHz.
•
The carry from the summer circuit is output to the PCM pin.
A block diagram of the PCM output is shown in Figure 32.
Exception conditions affect the PCM output as listed in Section 4.5.
Figure 32. PCM Output Function Block Diagram
Output Scaling
OC_x[9:1]
A
9 Bit ADDER
ARM_x/PCM_x
B
CARRY
SUM
fCLK = 8 MHz
Sample updated every 8
μS
9
9
9
D
FF
CLK
Q
Q
D
FF
CLK
Q
Q
D
FF
CLK
Q
Q
D
FF
CLK
Q
Q
D
FF
CLK
Q
Q
D
FF
CLK
Q
Q
D
FF
CLK
Q
Q
D
FF
CLK
Q
Q
D
FF
CLK
Q
Q



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