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Pins and Connections
ceramic capacitors (of approximately 1 μF, + 0.1 μF) can be used to efficiently bypass the power and
ground of both digital and analog supply rails.
3.3.4
RESETB pin
Figure 3-3 on page 31 illustrates an exhaustive arrangement where a Reset event can be generated by:
? An external, manual reset button
? The Background Debug Mode interface
? The V DD main supply
An external, pull-up resistor is necessary to reduce and better control the RESETB voltage-settling time.
An optional shunt capacitor to ground can be added to that node in order to reduce EMC and noise
susceptibility. With the shunt capacitor, the maximum RC time constant has to be strictly bounded. (For
details, see “System Integration Module” on page 189 .)
At power-up, the RESETB pin is configured as an input pin, but it also can be programmed as
bidirectional. Using the bidirectional feature, the MMA955xL platform can reset external devices for any
purpose other than power-on-reset. When using the RESETB pin output drive capability, the allowed
upper limit for the RC time constant is reduced to only micro-seconds.
3.3.5
Background / mode select (BKGD/MS)
Figure 3-3 on page 31 depicts the connection to the BKGD/MS pin when in-circuit debug capability is
desired.
In this configuration, the background header also takes control of the RESETB line. This could result in
parasitic capacitance from the BDM connector and its ribbon cable that may increase RESETB settling
time. This situation must be considered in the user ’s implementation.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
33
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