Atmel AT91EB42 manual Section Appendix a Configuration Straps, Configuration Straps CB1 23, JP1

Section 5

Appendix A – Configuration Straps

5.1Configuration 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.

AT91EB42 Evaluation Board User Guide 5-1