ATtiny44 datasheet(133/236 Pages) ATMEL

133 / 236 page

133

8006H–AVR–10/09

ATtiny24/44/84

Figure 16-1. Analog to Digital Converter Block Schematic

16.3

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 reference

voltage.The voltage reference for the ADC may be selected by writing to the REFS1..0 bits in

ADMUX. The VCC supply, the AREF pin or an internal 1.1V voltage reference may be selected

as the ADC voltage reference.

The analog input channel and differential gain are selected by writing to the MUX5..0 bits in

ADMUX. Any of the eight ADC input pins ADC7..0 can be selected as single ended inputs to the

ADC. For differential measurements all analog inputs next to each other can be selected as a

input pair. Every input is also possible to measure with ADC3. These pairs of differential inputs

are measured by ADC trough the differential gain amplifier.

ADC CONVERSION

COMPLETE IRQ

8-BIT DATA BUS

ADC MULTIPLEXER

SELECT (ADMUX)

ADC CTRL. & STATUS A

ADC DATA REGISTER

(ADCH/ADCL)

CONVERSION LOGIC

10-BIT DAC

SAMPLE & HOLD

COMPARATOR

INTERNAL

REFERENCE

1.1V

MUX DECODER

ADC7

ADC6

ADC5

ADC4

ADC MULTIPLEXER

OUTPUT

PRESCALER

TRIGGER

SELECT

ADTS2...ADTS0

INTERRUPT

FLAGS

START

GAIN

AMPLIFIER

NEG.

INPUT

MUX

SINGLE ENDED / DIFFERENTIAL SELECTION

TEMPERATURE

SENSOR

ADC8

BIN

ADC3

ADC2

ADC1

ADC0

POS.

INPUT

MUX

AGND

ADC CTRL. & STATUS B

AREF

ATtiny44 Datasheet(PDF) 133 Page - ATMEL Corporation

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