Rainbow-electronics ATtiny43U Manual do Utilizador Página 115

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115
8048B–AVR–03/09
16. Analog to Digital Converter
16.1 Features
10-bit Resolution
1 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
13µs Conversion Time
15 kSPS at Maximum Resolution
Four Multiplexed Single Ended Input Channels
Temperature Sensor Input Channel
Optional Left Adjustment for ADC Result Readout
0 - V
CC
ADC Input Voltage Range
1.1V ADC Reference Voltage
Free Running or Single Conversion Mode
ADC Start Conversion by Auto Triggering on Interrupt Sources
Interrupt on ADC Conversion Complete
Sleep Mode Noise Cancele
16.2 Overview
ATtiny43U features a 10-bit, successive approximation Analog-to-Digital Converter (ADC). A
block diagram of the ADC is shown in Figure 16-1.
Figure 16-1. Analog to Digital Converter Block Schematic
ADMUX
ADMUX
DECODER
DECODER
8-BIT DATA BUS
MUX2:0
ADCSRA
ADCSRA
ADCH+ADCL
ADCH+ADCL
ADPS0
ADEN
ADPS1
ADPS2
ADATE
ADIF
ADSC
TRIGGER
TRIGGER
SELECT
SELECT
ADTS2:0
START
PRESCALER
PRESCALER
ADC9:0
CONVERSION LOGIC
CONVERSION LOGIC
10-BIT DAC
10-BIT DAC
ADCSRB
ADCSRB
-
+
ADC3
ADC3
ADC2
ADC2
ADC1
ADC1
ADC0
ADC0
V
CC
CC
INPUT
INPUT
MUX
MUX
CHANNEL
ADIE
ADC IRQ
ADC IRQ
SAMPLE & HOLD
SAMPLE & HOLD
COMPARATOR
COMPARATOR
VBAT
VBAT
1/2
1/2
INTERNAL
INTERNAL
REFERENCE
REFERENCE
TEMPERATURE
TEMPERATURE
SENSOR
SENSOR
AGND
ADC MUX OUTPUT
ADC MUX OUTPUT
REFS
INTERRUPT FLAGS
ADLAR
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