Evaluation Kit Hardware
4-20
SAM4S-EK Development Board User Guide
11139A–ATARM–29-Nov-11
4.4.3
Test Points
Some test points have been placed on the SAM4S-EK board for the verification of important signals
.
4.4.4
Solder Drops
There are two solder drops designed on the SAM4S-EK for isolation.
4.4.5
Assigned PIO Lines, Disconnection Possibility
As pointed out in some previous interface description, 0 Ohm resistors have been inserted on the path of
the receiver PIO lines of the SAM4S-EK. These are the PIO lines connected to an external driver on the
board. The 0 Ohm resistors allow disconnecting each of these for custom usage (through PIO expansion
connectors for example). This feature gives the user an added level of versatility for prototyping a system
of his own. See the table below.
Table 4-5.
Audio Input Configuration
JP17
JP19
MONO-STEREO INPUT
OFF
OFF
PIN test point (TP12)
OFF
ON
Left-in only
ON
OFF
Right-in only
ON
ON
Sum of Left-in and Right-in
Table 4-6.
Test Points
Designation
Part
Description
TP1
Ring Hook
GND
TP2
Ring Hook
GND
TP3
Ring Hook
GND
TP4
Ring Hook
GND
TP5
Pad
UART TXD
TP6
Pad
UART RXD
TP7
Pad
LCD Backlight driver anode
TP8
Pad
Aux ADC input for Touch Screen controller
TP9
Pad
Aux ADC input for Touch Screen controller
TP10
Ring Hook
+5V
TP11
Ring Hook
+3V3
TP12
Pad
Optional Audio PA input
Table 4-7.
Solder Drops
Designation
Default Setting
Feature
SD1
OPEN
Isolation of DAC output from shared channel (PB14)
SD2
CLOSE
Connects PB14 to the AUDIO_OUTL channel
