Rainbow Electronics ATtiny43U - Manual (Page 115)

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 AD
A
T
E
ADIF
ADSC
TRIGGER TRIGGER
SELECT SELECT
ADTS2:0
ST
AR
T
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
INTERR
UPT FLA
GS
ADLAR