Atmel AT91SAM7L-STK Guía de usuario descargar pdf (Pagina 22)

Board Description

4-8 AT91SAM7L-STK Rev. B Starter Kit User Guide

6414A–ATARM–12-Sep-08

Figure 4-6. LCD Regulator is Externally Supplied by Battery

There is also a battery voltage monitor circuitry on the AT91SAM7L-STK board. The voltage is mea-

sured by AD3 of the AT91SAM7L128. This measurement bridge can be disconnected to save power

consumption in OFF mode.

This is under PC15 IO control as follows:

 PC15 = 0 enables the measurement bridge and half of the battery voltage is applied to AD3.

 PC15 = 1 or high impedance disables the measurement bridge.

Figure 4-7. Battery Supply Monitor Circuitry

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Atmel AT91SAM7L-STK Guía de usuario Pagina 22