Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Datenbogen
Produktcode
AT91SAM9N12-EK
4-16
SAM9N12/CN11-EK User Guide
11186A–ATARM–29-Nov-12
4.3.18
Analog Interface
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.
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).
programming and debugging (or to implement an analog user control such as display brightness, vol-
ume, etc).
Figure 4-22. Potentiometer
4.3.19
LED Indicators
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).
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
470R
R66
470R
Q2
IR LML2502
IR LML2502
1
3
2
D 8
Blue
D 10
R ed
PB6
VD DAN A