ATMEGA649A-AU Atmel, ATMEGA649A-AU Datasheet - Page 219

• Manufacturer Part Number: ATMEGA649A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA649A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

22. Analog to Digital Converter
22.1
22.2
8284A–AVR–10/10
Features
Overview
When this bit is written logic one, the digital input buffer on the AIN1/0 pin is disabled. The corresponding PIN Register bit will always read as zero when this bit is set. When an analog signal is applied to the AIN1/0 pin and the digital input from this pin is not needed, this bit should be written logic one to reduce power consumption in the digital input buffer.
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The ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P features a
10-bit successive approximation ADC. The ADC is connected to an 8-channel Analog Multi-
plexer which allows eight single-ended voltage inputs constructed from the pins of Port F. The
single-ended voltage inputs refer 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
The ADC has a separate analog supply voltage pin, AVCC. AV
± 0.3V from V
pin.
Internal reference voltages of nominally 1.1V or AVCC are provided On-chip. The voltage refer-
ence may be externally decoupled at the AREF pin by a capacitor for better noise performance.
The PRADC, in
the ADC module.
10-bit Resolution
0.5 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
13 µs - 260 µs Conversion Time (50 kHz to 1 MHz ADC clock)
Up to 76.9 kSPS at Maximum Resolution (200 kHz ADC clock)
Eight Multiplexed Single Ended Input Channels
Optional Left Adjustment for ADC Result Readout
0 - V
Selectable 1.1V ADC Reference Voltage
Free Running or Single Conversion Mode
ADC Start Conversion by Auto Triggering on Interrupt Sources
Interrupt on ADC Conversion Complete
Sleep Mode Noise Canceler
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
CC
220.
ADC Input Voltage Range
CC
”PRR – Power Reduction Register” on page 46
. See the paragraph
”ADC Noise Canceler” on page 226
must be written to zero to enable
CC
must not differ more than
on how to connect this
Figure 22-1
219