Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

11186A–ATARM–29-Nov-12

Figure 4-28.  Power Supply Connector J1

Figure 4-29.  JTAG J4

Table 4-7.  Power Supply Connector J1 Signal Descriptions

1

Center

+5V

2

Floating

3

GND

Table 4-8.  JTAG/ICE Connector J4 Signal Descriptions

1

VTref. 3.3V power

This is the target reference voltage. It is used to check if the target has power, 
to create the logic-level reference for the input

 

comparators, and to control the 

output logic levels to the target. It is normally fed from VDD on the target board 
and must not have a series resistor.

2

Vsupply. 3.3V power

This pin is not connected in SAM-ICE. It is reserved for compatibility with other 
equipment. Connect to VDD or leave open in target system.

3

nTRST TARGET 
RESET - Active-low 
output signal that 
resets the target

JTAG Reset. Output from SAM-ICE to the reset signal on the target

 

JTAG port. 

Typically connected to nTRST on the target CPU. This pin

 

is normally pulled 

HIGH on the target to avoid unintentional resets

 

when there is no connection.

4

GND

Common ground.