AT91SAM7L-STK Atmel, AT91SAM7L-STK Datasheet - Page 22

• Manufacturer Part Number: AT91SAM7L-STK
• Description: KIT EVAL FOR AT91SAM7L
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM7L-STK

• Contents: Evaluation Board, Parallel Cable and CD-ROM
• Kit Contents: Board Docs
• Supported Devices: AT91SAM7L64/128
• Tool / Board Applications: General Purpose MCU, MPU, DSP, DSC
• Development Tool Type: Hardware / Software - Starter Kit
• Rohs Compliant: Yes
• Mcu Supported Families: AT91SAM
• For Use With/related Products: AT91SAM7L
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AT91SAM7L-EK; AT91SAM7L-EK

6.1
6.2
AT91SAM7L-STK Rev. A Starter Kit User Guide
Q1 Footprint Incorrect
MAX3318 Control Pull-ups
Transistor Q1 is incorrectly connected. The schematic is right but the PCB connections of pins S and D
are swapped => the protection diode is polarized forward (permanent current flow across the bridge) and
the MOS is not operating properly (non accurate battery level measurement).
Remove Q1 in order to avoid the parasitic 150 µA battery drain. If battery measurement is really manda-
tory for some applications, Q1 has to be removed and soldered bottom up, taking care to apply the
correct polarity. Additionally, a 100 KΩ pull-up resistor is needed across gate and source.
The default configuration of the MAX3318 is ON. This leads to extra power consumption discharging the
batteries when the AT91SAM7L128 enters OFF mode (or does not even drive PC7 and PC12 to put the
MAX3318 in OFF mode).
Remove R1, R2 and R3 and add a 10M Ω pull-down resistor on PC7. This allows to Force OFF the
MAX3318 when the AT91SAM7L128 enters OFF mode and to turn it on when the AT91SAM7L128
wakes up. The user can save power consumption by driving PC7 connected to the FORCEOFF pin of
the MAX3318.
Problem Fix/Workaround
Problem Fix/Workaround
6409A–ATARM–30-Jun-08
Section 6
Errata
6-1