XC888LM datasheet(75/144 Pages) INFINEON

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XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

3.6

Power Supply System with Embedded Voltage Regulator

The XC886/888 microcontroller requires two different levels of power supply:

•

3.3 V or 5.0 V for the Embedded Voltage Regulator (EVR) and Ports

•

2.5 V for the core, memory, on-chip oscillator, and peripherals

Figure 21 shows the XC886/888 power supply system. A power supply of 3.3 V or 5.0 V

must be provided from the external power supply pin. The 2.5 V power supply for the

logic is generated by the EVR. The EVR helps to reduce the power consumption of the

whole chip and the complexity of the application board design.

The EVR consists of a main voltage regulator and a low power voltage regulator. In

active mode, both voltage regulators are enabled. In power-down mode, the main

voltage regulator is switched off, while the low power voltage regulator continues to

function and provide power supply to the system with low power consumption.

Figure 21

XC886/888 Power Supply System

EVR Features

•

Input voltage (

DDP): 3.3 V/5.0 V

•

Output voltage (

DDC): 2.5 V ± 7.5%

•

Low power voltage regulator provided in power-down mode

•

DDC and VDDP prewarning detection

•

DDC brownout detection

On-chip

OSC

CPU &

Memory

DDC

(2.5V)

DDP (3.3V/5.0V)

SSP

GPIO Ports

(P0-P5)

EVR

Peripheral

logic

FLASH

ADC

PLL

XTAL1&

XTAL2

XC888LM Datasheet(PDF) 75 Page - Infineon Technologies AG

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