
906
SAM4CP [DATASHEET]
43051E–ATPL–08/14
40.3
Block Diagram
Figure 40-1.
Analog-to-Digital Converter Block Diagram
40.4
Signal Description
Notes: 1.
AD7 is not an actual pin; it is internally connected to a temperature sensor.
AD6 is not an actual pin; it is internally connected to VDDBU.
AD2 is not bounded to an external pin.
2.
3.
40.5
Product Dependencies
40.5.1 Power Management
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.
40.5.2 Interrupt Sources
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.
ADC Interrupt
ADTRG
ADVREF
GND
Trigger
Selection
Control
Logic
Successive
Approximation
Register
Analog-to-Digital
Converter
Timer
Counter
Channels
User
Interface
Interrupt
Controller
Peripheral Bridge
APB
PDC
System Bus
Analog Inputs
Multiplexed
with I/O lines
PIO
AD-
AD-
AD-
ADC Controller
PMC
MCK
ADC Cell
CHx
Internal
Voltage
Reference
ONREF
Temp.
Sensor
1Hz
RTC
FORCEREF
VDDIN
VDDBU
6
7
Table 40-1. ADC Pin Description
Pin Name
Description
ADVREF
External Reference voltage
AD0 - AD7
(1)(2)(3)
Analog input channels
ADTRG
External trigger