ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 191
ATtiny87
Manufacturer Part Number
ATtiny87
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny87
Flash (kbytes)
8 Kbytes
Pin Count
20
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
16
Ext Interrupts
16
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Lin
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
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
3
Input Capture Channels
1
Pwm Channels
9
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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17. ADC – Analog to Digital Converter
17.1
17.2
8265B–AVR–09/10
Features
Overview
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The ATtiny87/167 features a 10-bit successive approximation ADC. The ADC is connected to
a 11-channel Analog Multiplexer which allows 16 differential voltage input combinations and
11 single-ended voltage inputs constructed from the pins PA[7:0] or PB[7:4]. The differential
input is equipped with a programmable gain stage, providing amplification steps of 8x or 20x
on the differential input voltage before the A/D conversion. The single-ended voltage inputs
refer to 0V (AGND).
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
17-1.
Internal reference voltages of nominally 1.1V or 2.56V are provided On-chip. Alternatively,
AV
output the internal 1.1V or 2.56V reference voltages or to input an external voltage reference
and turn-off the internal voltage reference. These options are selected using the REFS[1:0]
bits of the ADMUX control register and using AREFEN and XREFEN bits of the AMISCR con-
trol register.
10-bit Resolution
1.0 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
13 - 260 µs Conversion Time (Low - High Resolution)
Up to 15 kSPS at Maximum Resolution
11 Multiplexed Single Ended Input Channels
8 Differential input pairs with selectable gain
Temperature sensor input channel
Voltage from Internal Current Source Driving (ISRC)
Optional Left Adjustment for ADC Result Readout
0 - AV
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 Canceler
Unipolar / Bipolar Input Mode
Input Polarity Reversal Mode
CC
can be used as reference voltage for single ended channels. There are also options to
CC
ADC Input Voltage Range
Figure
191
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