Atmel AT91SAM7L-STK - Manual (Page 21)

Board Description
AT91SAM7L-STK Rev. B Starter Kit User Guide 4-7
6414A–ATARM–12-Sep-08
The battery power is supplied to VDDIO1 and VDDINLCD. The Main Voltage Regulator inside the chip
will convert the supply from VDDIO1 to VDDOUT, to be supplied to VDDCORE for ARM7TDMI core sup-
ply. The internal Charge Pump inside the chip will convert the supply from VDDINLCD to a 3.6V
VDD3V6, to be supplied to the VDDLCD pin for the Segment LCD controller. J8 is used for power-cur-
rent measurement on the AT91SAM7L128 power supply.
Figure 4-5. 2 AAA Batteries Single Power Supply, Board Default Setting
There is another option on the AT91SAM7L-STK. In order to provide direct battery supply to the LCD
voltage regulator, first disconnect pin2 and pin3 from Solder Drops SD2 and SD4, then reconfigure SD2
and SD4 by connecting pin1 and pin2 instead.
Note: For details on AT91SA7ML power consumption, refer to the table: “Power Consumption for Low Power
Modes” in the Electrical Characteristics section of the
AT91SAM7L Datasheet on Atmel.com .