AT91SAM7X128B-CU(2009) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

MFG CO.

AT91SAM7X128B-CU
(Rev.:2009)

AT91 ARM Thumb-based Microcontrollers

Atmel Corporation 

Adequate input supply decoupling is mandatory for VDDIN in order to improve startup stability

and reduce source voltage drop. The input decoupling capacitor should be placed close to the

chip. For example, two capacitors can be used in parallel: 100 nF NPO and 4.7 µF X7R.

5.4 Typical Powering Schematics

The AT91SAM7X512/256/128 supports a 3.3V single supply mode. The internal regulator input

connected to the 3.3V source and its output feeds VDDCORE and the VDDPLL. Figure 5-1

shows the power schematics to be used for USB bus-powered systems.

Figure 5-1. 3.3V System Single Power Supply Schematic

VDDFLASH

Power Source

ranges

from 4.5V (USB)

to 18V

DC/DC Converter

3.3V

VDDIO

VDDIN

VDDOUT

Voltage

Regulator

VDDCORE

VDDPLL

12 AT91SAM7X512/256/128 Preliminary

6120H–ATARM–17-Feb-09

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