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Appendix A – Configuration Straps
CB4
ADC Chip Select Line
Closed
Open
(1)
ADC (U20) control lines enabled.
ADC (U20) control lines disabled. This authorizes users to connect the
corresponding chip select line to their own resources via the I/O expansion
connector.
Note:
CB5
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
Standard Power Supply Supervisory Enabling
Closed
Open
(1)
Standard power supply is supervised by the ADC (U20) channel 1 via a
resistor bridge. The ratio is set to 0.1013 so that the standard power supply
can be supervised up to 15V.
Standard power supply is not connected to the ADC (U20) channel 1. This
allows the user to connect the corresponding ADC channel to their own
resources via the I/O expansion connector.
Note:
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
CB6
Closed (1)
Open
VDDCORE Voltage Monitoring
The ADC channel 3 is connected at the V DDCORE power supply. This allows
the user to tune the frequency clock according to the core voltage.
The ADC channel 3 is not connected and it is available on the I/O expansion
connector for user application.
Note:
CB7
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
Battery Power Supply Supervisory Enabling
Closed
Open
(1)
Battery power supply is supervised by the ADC (U20) channel 2 via a
resistor bridge. The ratio is set to 0.24 so that the battery voltage range can
be supervised (5.5V to 6.2V).
Battery power supply is not connected to the ADC (U20) channel 2. This
authorizes the user to connect the corresponding ADC channel to their own
resources via the I/O expansion connector.
Note:
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
CB8
Closed (1)
Open
Ambient Temperature Monitoring
The ADC channel 0 is connected to a temperature sensor near the
32.768 kHz crystal. This allows the user to evaluate the frequency drift
according to the ambient temperature.
The ADC channel 0 is not connected and it is available on the I/O expansion
connector for the user application.
Note:
AT91EB42 Evaluation Board User Guide
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
5-3
1708C–ATARM–12-May-05
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