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

11186A–ATARM–29-Nov-12

The 3.0V voltage reference is based on an LM4040 (Precision Micropower Shunt Voltage Reference). 
This ADVREF level can be set as 3.0V or 3.3V via the jumper JP3.

Figure 4-21.  Analog Reference

A 10 kohm potentiometer (VR1) is connected to AD6 port PB17 to implement an easy access to ADC 
programming and debugging (or to implement an analog user control such as display brightness, vol-
ume, etc).

Figure 4-22.  Potentiometer

There are three LEDs for general purpose on the SAM9N12/CN11-EK board:

„

D8 blue and D9 green LEDs are user defined and controlled by the GPIO.

„

D10 red LED is a power LED indicating that the 3.3V rail is enabled. It can also be controlled by the 
GPIO (by default, the GPIO is disabled and an on-board pull-up to 3.3V lights the LED).

Figure 4-23.  LED

R67

470R

PB5

D 9

Green

PB4

R 68

100K

R 69
470R

R66

470R

Q2
IR LML2502

1

3

2

D 8

Blue

D 10

R ed

PB6

VD DAN A