AT91EB42 datasheet(15/30 Pages) ATMEL

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AT91EB42 Evaluation Board User Guide

5-1

Section 5

Appendix A – Configuration Straps

5.1

Configuration

Straps (CB1 - 23,

JP1 - 8)

By adding the I/O and EBI expansion connectors, users can connect their own peripher-

als to the evaluation board. These peripherals may require more I/O lines than available

while the board is in its default state. Extra I/O lines can be made available by disabling

some of the on-board peripherals or features. This is done using the configuration straps

detailed below. Some of these straps present a default wire (notified by the default men-

tion) that must be cut before soldering the strap.

CB1

On-board PB5/A23/CS4 Signal

Closed

(1)

AT91 PB5/A23/CS4 signal is connected to the EBI expansion connector

(P1-B21).

Open

AT91 PB5/A23/CS4 signal is not connected to the EBI expansion connector

(P1-B21).

This authorizes users to connect the EBI expansion connector of this board

to the MPI expansion connector of an AT91EB63 Evaluation Board without

conflict problems.

CB2, CB3,

CB4

ADC Enabling

Closed

(1)

ADC (U20) control lines enabled

Open

ADC (U20) control lines disabled. This authorizes users to connect the

corresponding PIO to their own resources via the I/O expansion connector.

CB5

Battery Power Supply Supervisory Enabling

Closed

(1)

Battery power supply is supervised by the ADC (U20) channel 1 via a

resistor bridge. The ratio is set to 0.3333 so that the battery voltage range

can be supervised (5.5V to 6.2V).

Open

Battery power supply is not connected to the ADC (U20) channel 1. This

authorizes users to connect the corresponding ADC channel to their own

resources via the I/O expansion connector.

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