Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

1063

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

The ADC Controller is not continuously clocked. The programmer must first enable the ADC Controller MCK in the 

Power Management Controller (PMC) before using the ADC Controller. However, if the application does not 

require ADC operations, the ADC Controller clock can be stopped when not needed and restarted when 

necessary. Configuring the ADC Controller does not require the ADC Controller clock to be enabled.

The ADC interrupt line is connected on one of the internal sources of the Interrupt Controller. Using the ADC 

interrupt requires the interrupt controller to be programmed first.

The analog input pins can be multiplexed with PIO lines. In this case, the assignment of the ADC input is 

automatically done as soon as the corresponding channel is enabled by writing the register ADC_CHER. By 

default, after reset, the PIO line is configured as input with its pull-up enabled and the ADC input is connected to 

the GND.

The temperature sensor is internally connected to channel index 15 of the ADC.
The temperature sensor provides an output voltage V

T

 that is proportional to the absolute temperature (PTAT). To 

activate the temperature sensor, TSON bit (ADC_ACR)  needs to be set. After being set, the startup time of the 

temperature sensor must be achieved prior to initiating any measure.

The pin ADTRG may be shared with other peripheral functions through the PIO Controller. In this case, the PIO 

Controller should be set accordingly to assign the pin ADTRG to the ADC function.

ADC

29

ADC

ADTRG

PA8

B

ADC

AD0

PA17

X1

ADC

AD1

PA18

X1

ADC

AD2/WKUP9

PA19

X1

ADC

AD3/WKUP10

PA20

X1

ADC

AD4/RTCOUT0

PB0

X1

ADC

AD5/RTCOUT1

PB1

X1

ADC

AD6/WKUP12

PB2

X1

ADC

AD7

PB3

X1

ADC

AD8

PA21

X1

ADC

AD9

PA22

X1