Device Overview
MFR4310 Reference Manual, Rev. 2
44 Freescale Semiconductor
2.4.4 Power Supply Pins
MFR4310 power and ground pins are summarized in Table 2-4 and described below.
NOTE
All VSS pins must be connected together in the application.
Because fast signal transitions place high, short-duration current demands
on the power supply, use bypass capacitors with high-frequency
characteristics and place them as close to the MFR4310 as possible. Bypass
requirements depend on how heavily the MFR4310 pins are loaded.
2.4.4.1 VDDX, VSSX — Power and Ground Pins for I/O Drivers
External power and ground for I/O drivers.
2.4.4.2 VDDR, VSSR — Power and Ground Pins for I/O Drivers and Internal
Voltage Regulator
External power and ground for I/O drivers and input to the internal voltage regulator.
NOTE
The VDDR pin enables the internal 3.3 V to 2.5 V voltage regulator. If this
pin is tied to ground, the internal voltage regulator is turned off.
Table 2-4. MFR4310 Power and Ground Connection Summary
Mnemonic
Pin Number
Nominal
Voltage
Description
64-pin LQFP
VDD2_5 59 2.5V Internal power and ground generated by internal regulator
VSS2_5 60 0V
VDDR 20 3.3V External power and ground, supply to supply to pin drivers and internal
voltage regulator.
VSSR 19 0V
VDDX[1:4] 8, 37, 54, 35 3.3V External power and ground, supply to pin drivers.
VSSX[1:4] 9, 38, 53, 31 0V
VDDA 50 3.3V Operating voltage and ground for the internal voltage regulator.
VSSA 49 0V
VDDOSC 26 2.5V Provides operating voltage and ground for the internal oscillator. This
allows the supply voltage to the oscillator to be bypassed independently.
Internal power and ground generated by internal regulator.
VSSOSC 23 0V
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