3.4.4
MMA955xL Platform as a Sensor Hub
The MMA955xL device includes:
? a powerful 32-bit ColdFire V1 CPU
? a second I 2 C bus
? one external analog input
These features can all be monitored using the on-chip ADC.
The combination of low power consumption and powerful features means that the MMA955xL platform can effectively operate
as a power controller for handheld units such as industrial scanners, PDAs, and games. The host platform can put itself to sleep
with confidence that the MMA955xL device will issue a wake request should any external event require its attention.
The following figure illustrates the MMA955xL device being used in this configuration. Observe how all that is required is a few
bypass capacitors, a ferrite bead, and some pullup resistors for the I 2 C buses.
Figure 6. Platform as sensor hub
MMA955xL
Sensors
Freescale Semiconductor, Inc.
13
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