ATTINY87-15XZ Atmel, ATTINY87-15XZ Datasheet - Page 191

• Manufacturer Part Number: ATTINY87-15XZ
• Description: MCU AVR 8K FLASH 15MZ 20-TSSOP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY87-15XZ

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

17. ADC – Analog to Digital Converter
17.1
17.2
7728G–AVR–06/10
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 PA7..PA0 or PB7..PB4. The differen-
tial 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,
AVcc can be used as reference voltage for single ended channels. There are also options to
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 - AVcc ADC Input Voltage Range
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
ATtiny87/ATtiny167
Figure
191