Signal Descriptions
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
2-15
2.17 Power and Ground Pins
provide system power and ground to the chip. Multiple pins are provided
for adequate current capability. All power supply pins must have adequate decoupling (bypass
capacitance) for high-frequency noise suppression.
Some of the V
DD
and V
SS
pins on the device are only to be used for noise bypass.
shows a typical
connection diagram. Pay particular attention to those pins which show only capacitor connections.
CAUTION
Avoid connecting power-supply voltage directly to pins in
which
show only capacitor connections, as doing so could damage the device
severely.
Table 2-16. Power and Ground Pins
Signal Name
Abbreviation
Function
I/O
PLL Analog Supply
VDDPLL,
VSSPLL
Dedicated power supply signals to isolate the sensitive PLL analog
circuitry from the normal levels of noise present on the digital power
supply.
I
Positive Supply
VDD
These pins supply positive power to the core logic.
I
Ground
VSS
This pin is the negative supply (ground) to the chip.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60
