View detail for AVR462: Reducing the Power Consumption of AT90EIT1

View detail for AVR462: Reducing the Power Consumption of AT90EIT1
AVR462: Reducing the Power Consumption of the
AT90EIT1 – AVR Embedded Internet Toolkit.
The Embedded Internet Toolkit circuit board is known to become very hot during
extended operation. This is due to heat dissipation into the board from the voltage
regulator and the Cirrus Logic ethernet device. By performing this upgrade, power
consumption of the ethernet device can be reduced, thereby lowering the operating
temperature of the board.
Embedded
Internet Toolkit
Required Parts
Application
Note
•
No additional parts are required.
Required Tools
•
ESD-safe workstation
•
A good soldering iron
•
Desolder wick
•
Fine pliers
Work Description
This work must only take place on an ESD-safe workstation. The AT90EIT1 board
contains ESD sensitive components that may be damaged if not handled correctly.
Disconnect the power and ethernet cables from the board, and any other IO
connections.
Place the board such that the AVR Embedded Web Server text is correcly oriented.
Locate the area inbetween the Crystal LAN CS8900A-CG device and the ATmega103
device.
Identify the two surface mount resistors immediately to the right of the CS8900A-CQ
device. These two resistors are oriented along the top-bottom axis of the AT90EIT1
board. (Resistors R41 and R43 on the EIT schematic diagram, connected to pins 33
and 34 of the CS8900A-CQ.) See Figure 1 below for assistance.
Using the soldering iron and desolder wick, remove the solder from the resistors, and
carefully remove them from the board.
Check that no solder has been placed on the surrounding devices’ pins, which may
cause short circuits.
Rev. 2511A–AVR–03/02
1
Figure 1. The Resistors have been Removed from the Position Shown
Figure 2. Detail of the Area Concerned
For further assistance, contact [email protected]
2
AVR462
2511A–AVR–03/02
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