Atmel ATSAM3U-EK データシート
Evaluation Kit Hardware
SAM3U-EK Evaluation Kit User Guide
4-23
6478E–ATARM–30-Mar-11
4.4.3
Test Points
Some test points have been placed on the SAM3U-EK board for the verification of important signals.
4.4.4
Solder Drops
Two solder drops have been designed on the SAM3U-EK for isolation puposes.
4.4.5
Assigned PIO Lines, Disconnection Possibility
As pointed out in previous interface descriptions, 0-Ohm resistors have been inserted on the PIO lines
receiver path of the SAM3U-EK. Some PIO lines are connected to an external driver on the board. The
0-Ohm resistors allow disconnecting each of these for custom usage (through PIO expansion connec-
receiver path of the SAM3U-EK. Some PIO lines are connected to an external driver on the board. The
0-Ohm resistors allow disconnecting each of these for custom usage (through PIO expansion connec-
Table 4-9. Test Points
Designation
Part
Description
TP1
Pad
Aux ADC input IN3 for touch screen control
TP2
Pad
Aux ADC input IN4 for touch screen control
TP3
Ring Hook
+3V3
TP4
Ring Hook
+5V
TP5
Ring Hook
GND
TP6
Ring Hook
GND
TP7
Ring Hook
GND
TP8
Ring Hook
GND
TP9
Pad
FWUP
TP10
Pad
SHDN
TP11
Pad
ADVREF
TP12
Pad
AD12BVREF
TP13
Pad
LED_A1
TP14
Pad
LED_A2
TP15
Pad
LED_A3
TP16
Pad
LED_A4
TP17
Pad
UTXD
TP18
Pad
URXD
TP19
Pad
TXD1
TP20
Pad
RXD1
Table 4-10. Solder Drops
Designation
Default Setting
Feature
SD3
Open
Isolation of AD12BAD3 input from PIO expansion socket
SD4
Open
Isolation of AD0 input from PIO expansion socket