ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 22

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6478E–ATARM–30-Mar-11
Evaluation Kit Hardware
4.3.13
4.3.14
4-14
User Buttons
ADC Input
There are 8 multiplexed analog channel inputs on the 12-bit ADC, and 8 multiplexed analog channel
inputs on the 10-bit ADC. SAM3U-EK optionally connects the two ADC channels to BNC header (check
for your actual components implementation, schematics and BOM, on http://www.atmel.com/products/).
One is 12-bit ADC channel 3, shared with PIO pin PB4. The other one is 10-bit ADC channel 0, shared
with PIO PB5.
A potentiometer is also connected to these two channels to implement an easy access to ADC program-
ming and debugging (or implement an analog user control such as display brightness, volume, etc.).
Please note that SAM3U-EK default setting connects both AD12BAD3 and AD0 to the potentiometer so
that AD12BAD3 and AD0 are actually shorted. If these two ports need to work separately, R82 and/or
R84 should be removed.
There is another ADC application capability on SAM3U-EK
Figure 4-17. ADC Input
2 user buttons on the SAM3U-EK are connected to PIO lines, and are defined as left and right buttons by
default.
C N1
C N1
B NC
B NC
C N2
C N2
B NC
B NC
5
1
2
3
4
5
1
2
3
4
DG ND
DG ND
R 83
R 83
49.9R
49.9R
R 88
R 88
49.9R
49.9R
J P 19
J P 19
J P
J P
J P 18
J P 18
J P
J P
Potent i omet er
R 81
R 81
DNP
DNP
R 86
R 86
DNP
DNP
C 97
C 97
10nF
10nF
C 98
C 98
10nF
10nF
V R 1
V R 1
10K
10K
4
5
(See “G-Sensor” on page
+3V 3
DG ND
R 82
R 82
0R
0R
R 84
R 84
0R
0R
2
SAM3U-EK Evaluation Kit User Guide
P B 4
ADC
P B 5
C 99
C 99
10nF
10nF
ADC
AD12BAD3
AD0
4-15.)