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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