ATtiny261A datasheet(141/292 Pages) ATMEL

141 / 292 page

141

8197A–AVR–10/09

ATtiny261A/461A/861A

Figure 15-1. Analog to Digital Converter Block Schematic

15.3 Operation

The ADC converts an analog input voltage to a 10-bit digital value through successive approxi-

mation. The minimum value represents GND and the maximum value represents the voltage on

VCC, the voltage on the AREF pin or an internal 1.1V / 2.56V voltage reference.

The voltage reference for the ADC may be selected by writing to the REFS2:0 bits in ADCSRB

and ADMUX registers. The VCC supply, the AREF pin or an internal 1.1V / 2.56V voltage refer-

ence may be selected as the ADC voltage reference. Optionally the internal 1.1V / 2.56V voltage

ADC CONVERSION

COMPLETE IRQ

8-BIT DATA BUS

ADC MULTIPLEXER

SELECT (ADMUX)

ADC CTRL. & STATUS

ADC DATA REGISTER

(ADCH/ADCL)

CONVERSION LOGIC

10-BIT DAC

SAMPLE & HOLD

COMPARATOR

MUX DECODER

ADC7

ADC6

ADC5

ADC4

ADC3

ADC2

ADC1

ADC0

ADC

MULTIPLEXER OUTPUT

GAIN

AMPLIFIER

INTERNAL 1.18V

REFERENCE

PRESCALER

SINGLE ENDED /

DIFFERENTIAL SELECTION

AGND

POS.

INPUT

MUX

NEG.

INPUT

MUX

ADC10

ADC9

ADC8

VCC

AREF

TEMPERATURE

SENSOR

INTERNAL 2.56/1.1V

REFERENCE

MUX

ADC CTRL. & STATUS

ATtiny261A Datasheet(PDF) 141 Page - ATMEL Corporation

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