ATtiny24A Atmel Corporation, ATtiny24A Datasheet - Page 132

• Manufacturer Part Number: ATtiny24A
• Manufacturer: Atmel Corporation

Specifications of ATtiny24A

• Flash (kbytes): 2 Kbytes
• Pin Count: 14
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 12
• Ext Interrupts: 12
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

16. Analog to Digital Converter
16.1
16.2
132
Features
Overview
ATtiny24A/44A/84A
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ATtiny24A/44A/84A features a 10-bit, successive approximation Analog-to-Digital Converter
(ADC). The ADC is wired to a nine-channel analog multiplexer, which allows the ADC to mea-
sure the voltage at eight single-ended input pins, or between twelve differential pairs of input
pins, or from one internal, single-ended voltage channel coming from the internal temperature
sensor. Single-ended voltage inputs are referred to 0V (GND), while differential-ended input
pairs are subject to a gain stage with programmable amplification steps of 0 dB (1x) and 26 dB
(20x).
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
on page
Internal reference voltage of nominally 1.1V is provided on-chip. Alternatively, V
as reference voltage for single ended channels. There is also an option to use an external volt-
age reference and turn-off the internal voltage reference.
10-bit Resolution
1 LSB Integral Non-linearity
±2 LSB Absolute Accuracy
13 µs Conversion Time
15 kSPS at Maximum Resolution
Eight Multiplexed Single Ended Input Channels
Twelve Differential Input Channels with Selectable Gain (1x, 20x)
Temperature Sensor Input Channel
Optional Left Adjustment for ADC Result Readout
0 - V
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 Canceler
Unipolar / Bipolar Input Mode
Input Polarity Reversal Mode
CC
133.
ADC Input Voltage Range
CC
8183D–AVR–04/11
can be used
Figure 16-1