Technical Specifications of ATMEGA644P-20AU
| Category | Integrated Circuits (ICs) |
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| Family | Embedded - Microcontrollers |
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| Manufacturer | Atmel |
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| Series | AVR? ATmega |
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| Packaging | Tray |
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| Part Status | Active |
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| Core Processor | AVR |
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| Core Size | 8-Bit |
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| Speed | 20MHz |
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| Connectivity | I2C, SPI, UART/USART |
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| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
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| Number of I/O | 32 |
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| Program Memory Size | 64KB (32K x 16) |
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| Program Memory Type | FLASH |
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| EEPROM Size | 2K x 8 |
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| RAM Size | 4K x 8 |
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| Voltage - Supply (Vcc/Vdd) | 2.7 V ~ 5.5 V |
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| Data Converters | A/D 8x10b |
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| Oscillator Type | Internal |
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| Operating Temperature | -40°C ~ 85°C (TA) |
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| Package / Case | 44-TQFP |
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| Supplier Device Package | 44-TQFP (10x10) |
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