MFC2000 datasheet(132/426 Pages) ETC

132 / 426 page

MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

5-6

Conexant

100723A

5.1.5

Power on/off Sequence

5.1.5.1

Power Type

+3.3V prime power signal

•

Connect to VDD pins on the MFC2000 chip to supply prime power to the MFC2000 die in the MFC2000 chip.

+5V prime power signal

•

Connect to ADVA and ADVD pins on the MFC2000 chip to supply prime power to the ADC die in the

MFC2000 chip.

•

Connect to VGG pins on the MFC2000 chip to supply +5v prime power to all +5v tolerant pads in the

MFC2000 chip.

+3V battery power signal

•

Connect to the VBAT pin on the MFC2000 chip to supply battery power to the battery backup RTC in the

MFC2000 chip and external SRAM.

•

Connect to the VDRAM pin on the MFC2000 chip to supply battery power to the battery backup DRAM

refresh logic in the MFC2000 chip and external DRAM.

5.1.5.2

Prime Power Sequence

It is recommended that +3.3v prime power signal is supplied first and then, supply +5v prime power signal for the

prime power-on sequence. In other words, The voltage level of +5v prime power signal must be lower than the

voltage level of +3.3v prime power signal before +3.3v prime power signal reaches the stable level.

V+5 is turned off first and then, turn off V+3.3 for the prime power-off sequence. In other words, The voltage level of

+5v prime power signal must be always lower than the voltage level of +3.3v prime power signal during the

power-off sequence.

The recommended connection between +5v prime power signal and VGG is shown:

1Kohm

.1uF

+5V

VGG

Figure 5-4. +5v Prime Power Signal and VGG

MFC2000 Scheda tecnica(PDF) 132 Page - List of Unclassifed Manufacturers