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Pins and Connections
3.3
3.3.1
System connections
Platform as an intelligent slave
Figure 3-3 shows an example of the complete system connections when the MMA955xL platform is used
as a smart-accelerometer, slave peripheral to a host processor.
All that are required to attach the MMA955xL device to a master CPU are I 2 C termination resistors, a
ferrite bead and a few bypass capacitors. Optionally, the RGPIO pins can be programmed to generate
interrupts in order to wake the master CPU, as required by any changes in the inertial input. In the latter
case, the interrupts should be routed to the external interrupt input pins of the master CPU.
Figure 3-3 includes the background debug header connections as well as a manual reset push button.
V DD
Ferrite Bead or
10- ? F Inductor
C 4
1 ? F
C 3
0.1 ? F
R P3
4.7 k ?
C 1
1 μF
C 2
0.1 ? F
V SS
V DD
BDM HEADER
1
BKGD/MS
1
2
16
15
14
13
12
RESETB
3
Sensing Platform
11
Optional
4
10
V SS
EMC
Filter
Optional
Manual
Reset
V DD
R P1
4.7 k ?
V SS
5
6
7
8
9
SCL0
V DD
V DD
MASTER
CPU
SDA0
R P2
4.7 k ?
R P4
10 k ?
Figure 3-3. Platform as a slave with BDM header and reset button
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
31
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