ATmega1281 Atmel Corporation, ATmega1281 Datasheet - Page 275
ATmega1281
Manufacturer Part Number
ATmega1281
Description
Manufacturer
Atmel Corporation
Specifications of ATmega1281
Flash (kbytes)
128 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
54
Ext Interrupts
17
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
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
No
Crypto Engine
No
Sram (kbytes)
8
Eeprom (bytes)
4096
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
6
Output Compare Channels
16
Input Capture Channels
2
Pwm Channels
8
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATmega1281-8MC
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
- Current page: 275 of 448
- Download datasheet (8Mb)
26. ADC – Analog to Digital Converter
26.1
2549N–AVR–05/11
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
The ATmega640/1280/1281/2560/2561 features a 10-bit successive approximation ADC. The
ADC is connected to an 8/16-channel Analog Multiplexer which allows eight/sixteen single-
ended voltage inputs constructed from the pins of Port F and Port K. The single-ended voltage
inputs refer to 0V (GND).
The device also supports 16/32 differential voltage input combinations. Four of the differential
inputs (ADC1 & ADC0, ADC3 & ADC2, ADC9 & ADC8 and ADC11 & ADC10) are equipped with
a programmable gain stage, providing amplification steps of 0 dB (1×), 20 dB (10×) or 46 dB
(200×) on the differential input voltage before the ADC conversion. The 16 channels are split in
two sections of 8 channels where in each section seven differential analog input channels share
a common negative terminal (ADC1/ADC9), while any other ADC input in that section can be
selected as the positive input terminal. If 1× or 10× gain is used, 8 bit resolution can be
expected. If 200× gain is used, 7 bit resolution can be expected.
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
The ADC has a separate analog supply voltage pin, AVCC. AVCC must not differ more than
±0.3V from V
pin.
Internal reference voltages of nominally 1.1V, 2.56V or AVCC are provided On-chip. The voltage
reference may be externally decoupled at the AREF pin by a capacitor for better noise
performance.
The Power Reduction ADC bit, PRADC, in
must be disabled by writing a logical zero to enable the ADC.
10-bit Resolution
1 LSB Integral Non-linearity
±2 LSB Absolute Accuracy
13µs - 260µs Conversion Time
Up to 76.9kSPS (Up to 15kSPS at Maximum Resolution)
16 Multiplexed Single Ended Input Channels
14 Differential input channels
4 Differential Input Channels with Optional Gain of 10× and 200×
Optional Left Adjustment for ADC Result Readout
0V - V
2.7V - V
Selectable 2.56V or 1.1V ADC Reference Voltage
Free Running or Single Conversion Mode
Interrupt on ADC Conversion Complete
Sleep Mode Noise Canceler
CC
276.
CC
ADC Input Voltage Range
Differential ADC Voltage Range
CC
. See the paragraph
ATmega640/1280/1281/2560/2561
“ADC Noise Canceler” on page 283
“PRR0 – Power Reduction Register 0” on page 56
on how to connect this
Figure 26-1
275
Related parts for ATmega1281
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
U6046BREAR WINDOW HEATING TIMER / LONG-TERM TIMER
Manufacturer:
ATMEL Corporation
Datasheet: