MPC5604B datasheet(53/106 Pages) FREESCALE

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Electrical characteristics

MPC5604B/C Microcontroller Data Sheet, Rev. 8

Freescale Semiconductor

4.9

Power management electrical characteristics

4.9.1

Voltage regulator electrical characteristics

The device implements an internal voltage regulator to generate the low voltage core supply VDD_LV from the high voltage

ballast supply VDD_BV. The regulator itself is supplied by the common I/O supply VDD. The following supplies are involved:

•

HV—High voltage external power supply for voltage regulator module. This must be provided externally through VDD

power pin.

•

BV—High voltage external power supply for internal ballast module. This must be provided externally through

VDD_BV power pin. Voltage values should be aligned with VDD.

•

LV—Low voltage internal power supply for core, FMPLL and flash digital logic. This is generated by the internal

voltage regulator but provided outside to connect stability capacitor. It is further split into four main domains to ensure

noise isolation between critical LV modules within the device:

— LV_COR—Low voltage supply for the core. It is also used to provide supply for FMPLL through double bonding.

— LV_CFLA—Low voltage supply for code flash module. It is supplied with dedicated ballast and shorted to

LV_COR through double bonding.

— LV_DFLA—Low voltage supply for data flash module. It is supplied with dedicated ballast and shorted to

LV_COR through double bonding.

— LV_PLL—Low voltage supply for FMPLL. It is shorted to LV_COR through double bonding.

Figure 10. Voltage regulator capacitance connection

The internal voltage regulator requires external capacitance (CREGn) to be connected to the device in order to provide a stable

low voltage digital supply to the device. Capacitances should be placed on the board as near as possible to the associated pins.

Care should also be taken to limit the serial inductance of the board to less than 5 nH.

DEVICE

VSS_LV

VDD_BV

VDD_LV

VSS_LV

VDD_LV

VDD

VSS_LV

VDD_LV

CREG2 (LV_COR/LV_CFLA)

CREG3 (LV_COR/LV_PLL)

CDEC2 (supply/IO decoupling)

DEVICE

VDD_BV

VDD_LVn

VREF

VDD

Voltage Regulator

VSS

VSS_LVn

GND

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