ATmega325A Atmel Corporation, ATmega325A Datasheet - Page 249

• Manufacturer Part Number: ATmega325A
• Manufacturer: Atmel Corporation

Specifications of ATmega325A

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 20 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: 2
• Twi (i2c): 1
• Uart: 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: No
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• 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: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Table 25-3.
8285D–AVR–06/11
Signal Name
DAC_9
DAC_8
DAC_7
DAC_6
DAC_5
DAC_4
DAC_3
DAC_2
DAC_1
DAC_0
EXTCH
GNDEN
HOLD
IREFEN
MUXEN_7
MUXEN_6
MUXEN_5
MUXEN_4
MUXEN_3
MUXEN_2
MUXEN_1
MUXEN_0
NEGSEL_2
NEGSEL_1
NEGSEL_0
PASSEN
Boundary-scan Signals for the ADC
Direction as seen
from the ADC
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
Description
Bit 9 of digital value to DAC
Bit 8 of digital value to DAC
Bit 7 of digital value to DAC
Bit 6 of digital value to DAC
Bit 5 of digital value to DAC
Bit 4 of digital value to DAC
Bit 3 of digital value to DAC
Bit 2 of digital value to DAC
Bit 1 of digital value to DAC
Bit 0 of digital value to DAC
Connect ADC channels 0 - 3 to by-
pass path around differential
amplifier
Ground the negative input to
comparator when true
Sample & Hold signal. Sample
analog signal when low. Hold signal
when high. If differential amplifier is
used, this signal must go active
when ACLK is high.
Enables Band-gap reference as
AREF signal to DAC
Input Mux bit 7
Input Mux bit 6
Input Mux bit 5
Input Mux bit 4
Input Mux bit 3
Input Mux bit 2
Input Mux bit 1
Input Mux bit 0
Input Mux for negative input for
differential signal, bit 2
Input Mux for negative input for
differential signal, bit 1
Input Mux for negative input for
differential signal, bit 0
Enable pass-gate of differential
amplifier.
(1)
(Continued)
Recommended
Input when not
in Use
1
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
1
0
0
0
1
Output Values when
recommended inputs are Used,
and CPU is not Using the ADC
1
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
1
0
0
0
1
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