Datasheet

137
ATtiny828 [DATASHEET]
8371A–AVR–08/12
15. Analog to Digital Converter
15.1 Features
z 10-bit Resolution
z 1 LSB Integral Non-linearity
z ± 2 LSB Absolute Accuracy
z 15µs Conversion Time
z 15 kSPS at Maximum Resolution
z 28 Multiplexed Single Ended Input Channels
z Temperature Sensor Input Channel
z Optional Left Adjustment for ADC Result Readout
z 0 - V
CC
ADC Input Voltage Range
z 1.1V ADC Reference Voltage
z Free Running or Single Conversion Mode
z ADC Start Conversion by Auto Triggering on Interrupt Sources
z Interrupt on ADC Conversion Complete
z Sleep Mode Noise Canceler
15.2 Overview
ATtiny828 features a 10-bit, successive approximation Analog-to-Digital Converter (ADC). The ADC is wired to a 32-
channel analog multiplexer, which allows the ADC to measure the voltage at 28 single-ended input pins, or from four
internal, single-ended voltage channels coming from the internal temperature sensor, internal voltage reference, analog
ground, or supply voltage. Voltage inputs are referred to 0V (GND).
The ADC contains a Sample and Hold circuit which ensures that the input voltage to the ADC is held at a constant level
during conversion. A block diagram of the ADC is shown in Figure 53 on page 138.
Internal reference voltage of nominally 1.1V is provided on-chip. Alternatively, V
CC
can be used as reference voltage for
single ended channels.