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SAM9N12/CN11-EK User Guide
4-23
11186A–ATARM–29-Nov-12
4.4
Connectors
4.4.1
Power Supply
Figure 4-28. Power Supply Connector J1
4.4.2
JTAG/ICE Connector
Figure 4-29. JTAG J4
Table 4-7. Power Supply Connector J1 Signal Descriptions
Pin
Mnemonic
Signal description
1
Center
+5V
2
Floating
3
GND
Table 4-8. JTAG/ICE Connector J4 Signal Descriptions
Pin
Mnemonic
Signal Description
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.