ATtiny88 Atmel Corporation, ATtiny88 Datasheet - Page 164
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ATtiny88
Manufacturer Part Number
ATtiny88
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny88
Flash (kbytes)
8 Kbytes
Pin Count
32
Max. Operating Frequency
12 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
28
Ext Interrupts
28
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)
0.5
Eeprom (bytes)
64
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
2
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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17. ADC – Analog to Digital Converter
17.1
17.2
164
Features
Overview
ATtiny48/88
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ATtiny48/88 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 measure the volt-
age at six (or eight, in 32-lead/pad/ball packages) single-ended input pins and from one internal,
single-ended voltage channel coming from the internal temperature sensor. Single-ended volt-
age 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
on page
There is a separate analog supply voltage pin for the ADC, AV
between supply voltage pins V
celer” on page 171
Internal reference voltage of nominally 1.1V is provided on-chip. Alternatively, V
as reference voltage.
10-bit Resolution
1 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
14 µs Conversion Time
15 kSPS at Maximum Resolution
Six Multiplexed Single Ended Input Channels
Temperature Sensor Input Channel
Optional Left Adjustment for ADC Result Readout
0
Selectable 1.1V ADC Reference Voltage
Free Running or Single Conversion Mode
Interrupt on ADC Conversion Complete
Sleep Mode Noise Canceler
–
– Two Additional Input Channels in 32-lead/pad/ball TQFP, QFN, and UFBGA Packages
V
CC
165.
ADC Input Voltage Range
on how to connect the analog suplly voltage pin.
CC
and AV
CC
may not exceed 0.3V. See section
CC
. The voltage difference
“ADC Noise Can-
CC
8008H–AVR–04/11
can be used
Figure 17-1