
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
DECODER
8-BIT DATA BUS
MUX2:0
ADCSRA
ADCH+ADCL
ADPS0
ADEN
ADPS1
ADPS2
ADATE
ADIF
ADSC
TRIGGER
SELECT
ADTS2:0
START
PRESCALER
ADC9:0
CONVERSION LOGIC
10-BIT DAC
ADCSRB
-
+
ADC3
ADC2
ADC1
ADC0
CC
INPUT
MUX
CHANNEL
ADIE
ADC IRQ
SAMPLE & HOLD
COMPARATOR
VBAT
1/2
INTERNAL
REFERENCE
TEMPERATURE
SENSOR
AGND
ADC MUX OUTPUT
REFS
INTERRUPT FLAGS
ADLAR
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