MPC821 datasheet(65/242 Pages) NXP

65 / 242 page

Functional Description

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Current Consumption" below.

To protect on board devices against supply spikes, decoupling capacitors (typically 0.1

µF) are

provided between the devices’ power leads and GND, located as close as possible to the power

leads.

4•13•1

5V Bus

Some of the FADS peripherals reside on the 5V bus. Since the MPC is 5V friendly, it may operate

with 5V levels on its lines with no damage. The 5V bus is connected to an external power connector

via a fuse (5A).

To protect against reverse-voltage or over-voltage being applied to the 5V inputs a set of high-current

diodes and zener diode is connected between the 5V bus GND. When either over or reverse voltage

is applied to the FADS, the protection logic will blow the fuse, while limiting the momentary effects on

board.

4•13•2

3.3V Bus

The MPC itself as well as the SDRAM, the address and data buffers are powered by the 3.3A bus,

which is produced from the 5V bus using a special low-voltage drop, linear voltage regulator made

by Micrel, the MIC29500-3.3BT which is capable of driving upto 5A, facilitating operation of external

logic as well.

4•13•3

12V Bus

The sole purpose of the 12V bus is to supply VPP (programming voltage) for the PCMCIA card and

for the Flash SIMMB. It is connected to a dedicated input connector via a fuse (1A) and protected from

over / reverse voltage application.

If the 12V supply is not required for either the PC-Card and for the flash SIMM, the 12V input to the

FADS may be omitted.

A. At full speed. When lower performance is needed the internal logic may be powered from the 2V bus.

B. If necessary.

TABLE 4-26. Off-board Application Maximum Current Consumption

Power BUS

Current

3.3V

0.5A

12V

100 mA.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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