ATtiny85 Atmel Corporation, ATtiny85 Datasheet - Page 126

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ATtiny85

Manufacturer Part Number
ATtiny85
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATtiny85

Flash (kbytes)
8 Kbytes
Pin Count
8
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
3
Hardware Qtouch Acquisition
No
Max I/o Pins
6
Ext Interrupts
6
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
4
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.5
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
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
5
Pwm Channels
6
32khz Rtc
No
Calibrated Rc Oscillator
Yes

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17. Analog to Digital Converter
17.1
17.2
126
Features
Overview
ATtiny25/45/85
The ATtiny25/45/85 features a 10-bit successive approximation Analog to Digital Converter
(ADC). The ADC is connected to a 4-channel Analog Multiplexer which allows one differential
voltage input and four single-ended voltage inputs constructed from the pins of Port B. The dif-
ferential input (PB3, PB4 or PB2, PB5) is equipped with a programmable gain stage, providing
amplification step of 26 dB (20x) on the differential input voltage before the A/D conversion. The
single-ended voltage inputs refer 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
on page
Internal reference voltages of nominally 1.1V / 2.56V are provided on-chip. Alternatively, V
can be used as reference voltage for single ended channels. There is also an option to use an
external voltage reference and turn-off the internal voltage reference.
10-bit Resolution
1 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
65 - 260 µs Conversion Time
Up to 15 kSPS at Maximum Resolution
Four Multiplexed Single Ended Input Channels
Two differential input channels with selectable gain
Temperature sensor input channel
Optional Left Adjustment for ADC Result Readout
0 - V
Selectable 1.1V / 2.56V ADC Voltage Reference
Free Running or Single Conversion Mode
ADC Start Conversion by Auto Triggering on Interrupt Sources
Interrupt on ADC Conversion Complete
Sleep Mode Noise Cancele
Unipolar / Bibilar Input Mode
Input Polarity Reversal Mode
CC
127.
ADC Input Voltage Range
2586N–AVR–04/11
Figure 17-1
CC

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