MAC7200 datasheet(134/976 Pages) FREESCALE

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Power Supply Pins

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

will be non-functional. It is critical to the operation of the ATD and the MCU that this supply be kept as

noise-free as possible.

4.4.9

VRH, VRL — ATD Reference Voltage Input Pins

VRH and VRL are the reference voltage input pins for the analog to digital converter.

4.4.10

REFBYPC — ATD Reference Voltage Bypass Capacitor

REFBYPC is used to filter the 3/4 VRH reference voltage. A 100nF external capacitor should be placed

between this pin and the VRL pin.

4.4.11

VDDPLL, VSSPLL — Power Supply Pins for PLL

These pins provide the operating voltage and ground for the Oscillator and the Phased-Locked Loop. This

allows the supply voltage to the Oscillator and PLL to be bypassed independently.This 3.3V voltage is

generated by the internal voltage regulator when the voltage regulator is enabled. Otherwise, it must be

supplied externally.

NOTE

No load allowed except for bypass capacitors.

4.4.12

VSS-TEST — Power Supply Pin

This input only pin is reserved for test. The pin must be tied to VSS in all applications. If this pin is shorted

to a VDD supply the operation of the device will be unpredictable. If the pin is left open, an internal

pulldown will protect the device operation.

Table 4-2. MAC72xx Power and Ground Connection Summary

Mnemonic

Pin Number

Nominal

Voltage

Description

144 QFP

100 QFP

VDD15a

127

1.5 V

Provides operating voltage and ground for the MCU core

logic, including the MCU core, all peripherals, and all

RAMs. This allows the supply voltage to the core to be

bypassed independently. When not bypassed, the core

supply is generated by the internal voltage regulators, and

these pins are used for an external bypass capacitor.

VSS15a

126

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