AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 539

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

36. Analog-to-Digital Converter (ADC)
36.1
36.2
Figure 36-1. Analog-to-Digital Converter Block Diagram
Overview
The ADC is based on a Successive Approximation Register (SAR) 10-bit Analog-to-Digital Converter (ADC). It also
integrates an 8-to-1 analog multiplexer, making possible the analog-to-digital conversions of 8 analog lines. The
conversions extend from 0V to ADVREF.
The ADC supports an 8-bit or 10-bit resolution mode, and conversion results are reported in a common register for
all channels, as well as in a channel-dedicated register. Software trigger, external trigger on rising edge of the
ADTRG pin or internal triggers from Timer Counter output(s) are configurable.
The ADC also integrates a Sleep Mode and a conversion sequencer and connects with a PDC channel. These fea-
tures reduce both power consumption and processor intervention.
Finally, the user can configure ADC timings, such as Startup Time and Sample & Hold Time.
Block Diagram
Analog Inputs
with I/O lines
Multiplexed
Dedicated
Analog
Inputs
ADVREF
ADTRG
VDDIN
AD-
AD-
AD-
AD-
AD-
AD-
GND
PIO
Selection
Channels
Trigger
Counter
Timer
Analog-to-Digital
Approximation
ADC cell
Successive
Converter
Register
ADC Controller
Interface
Control
PMC
Logic
User
MCK
SAM7S Series [DATASHEET]
ADC Interrupt
PDC
6175M–ATARM–26-Oct-12
AIC
Peripheral Bridge
ASB
APB
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