Products > Integrated Circuits (ICs) > Embedded Processors & Controllers > ATMEGA644P-20AU

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8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash,Microcontrollers (MCU) AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V

  • Package/Case :
  • TQFP-44
  • Product Categories :
  • 8-bit Microcontrollers - MCU
  • RoHs Status:
  • Lead free/RoHS Compliant
  • Marking Code:
  • ATMEGA644P 20AU
  • In-stock:
  • 6000


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ATMEGA644P-20AU Product Details

Mature product; not recommended for new designs. Replaced by ATmega644PA.




• High-performance, Low-power AVR® 8-bit Microcontroller 

• Advanced RISC Architecture 

– 131 Powerful Instructions 

– Most Single-clock Cycle Execution 

– 32 x 8 General Purpose Working Registers – Fully Static Operation 

– Up to 20 MIPS Throughput at 20 MHz 

– On-chip 2-cycle Multiplier 

• Nonvolatile Program and Data Memories 

– 16/32/64K Bytes of In-System Self-Programmable Flash Endurance: 10,000 Write/Erase Cycles 

– Optional Boot Code Section with Independent Lock Bits In-System Programming by On-chip Boot Program True Read-While-Write Operation 

– 512B/1K/2K Bytes EEPROM Endurance: 100,000 Write/Erase Cycles 

– 1/2/4K Bytes Internal SRAM 

– Programming Lock for Software Security 

• JTAG (IEEE std. 1149.1 Compliant) Interface 

– Boundary-scan Capabilities According to the JTAG Standard 

– Extensive On-chip Debug Support 

– Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface 

• Peripheral Features 

– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes 

– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode 

– Real Time Counter with Separate Oscillator 

– Six PWM Channels 

– 8-channel, 10-bit ADC Differential mode with selectable gain at 1x, 10x or 200x 

– Byte-oriented Two-wire Serial Interface 

– Two Programmable Serial USART 

– Master/Slave SPI Serial Interface

 – Programmable Watchdog Timer with Separate On-chip Oscillator 

– On-chip Analog Comparator 

– Interrupt and Wake-up on Pin Change 

• Special Microcontroller Features 

– Power-on Reset and Programmable Brown-out Detection 

– Internal Calibrated RC Oscillator 

– External and Internal Interrupt Sources 

– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby and Extended Standby

 • I/O and Packages 

– 32 Programmable I/O Lines 

– 40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF 

• Operating Voltages 

– 1.8 - 5.5V for ATmega164P/324P/644PV 

– 2.7 - 5.5V for ATmega164P/324P/644P 

• Speed Grades 

– ATmega164P/324P/644PV: 0 - 4MHz @ 1.8 - 5.5V, 0 - 10MHz @ 2.7 - 5.5V – ATmega164P/324P/644P: 0 - 10MHz @ 2.7 - 5.5V, 0 - 20MHz @ 4.5 - 5.5V 

• Power Consumption at 1 MHz, 1.8V, 25°C for ATmega164P/324P/644P 

– Active: 338/398/TBD µA – Power-down Mode:0.035 /0.027/TBD µA 

– Power-save Mode:0.5 /0.5/TBD µA (Including 32 kHz RTC)

ATMEGA644P-20AU Pinout
(Picture: Pinout)

ATMEGA644P-20AU Block Diagram
(Picture: Diagram)

Technical Parameters

  • Core
  • AVR
  • Data Bus Width
  • 8 bit
  • Maximum Clock Frequency
  • 20 MHz
  • Program Memory Size
  • 64 KB
  • Data RAM Size
  • 4 KB
  • On Chip ADC
  • Yes
  • Operating Supply Voltage
  • 2.7 V to 5.5 V
  • Maximum Operating Temperature
  • + 85 C
  • Package / Case
  • TQFP-44
  • Mounting Style
  • Data ROM Size
  • 2 KB
  • Interface Type
  • 2-Wire, SPI, UART
  • Minimum Operating Temperature
  • - 40 C
  • Number of Programmable I/Os
  • 32
  • Number of Timers
  • 3
  • Processor Series
  • megaAVR
  • Program Memory Type
  • Flash
  • Factory Pack Quantity
  • 160
  • Supply Voltage Max
  • 5.5 V
  • Supply Voltage Min
  • 2.7 V

ATMEGA644P-20AU Related Products

Ratings and Reviews (1)

  • 5 / 5
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  • **teve***

    Just as ordered, thanks! A+++

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Estimated Delivery Time: Sep 29 - Oct 04 days (choose Expedited at checkout).

Shipping & Payment


  • Shipping Type
  • Ship Fee
  • Lead Time
  • $20.00-$40.00 (0.50 KG)
  • 2-5 days
  • $20.00-$40.00 (0.50 KG)
  • 3-7 days
  • $20.00-$45.00 (0.50 KG)
  • 2-5 days
  • $25.00-$65.00 (0.50 KG)
  • 2-5 days
  • $25.00-$45.00 (0.50 KG)
  • 5-14 days
  • $2.00-$3.00 (0.10 KG)
  • 7-30 days

Processing Time:Shipping fee depend on different zone and country.


  • Terms of payment
  • Hand Fee
  • Payment Site
  • charge US$30.00 banking fee.
  • charge 4.0% service fee.
  • charge 3.5% service fee.
  • charge US$0.00 banking fee.
  • charge US$0.00 banking fee.

We provide high quality products, thoughtful service and after sale guarantee

  • We have rich products, can meet your various needs.

    We have rich products, can meet your various needs.

  • Minimum order quantity starts from 1pcs.

    Minimum order quantity starts from 1pcs.

  • Lowest international shipping fee starts from US$2.00.

    Lowest international shipping fee starts from US$2.00.

  • 90 days quality guarantee for all products.

    90 days quality guarantee for all products.


  • Step1:Product

    Step1: Products

  • Step2:Vacuum packaging

    Step2: Vacuum Packaging

  • Step3:Anti-static bag

    Step3: Anti-Static Bag

  • Step4:Individual packaging

    Step4: Individual Packaging

  • Step5:Packaging boxes

    Step5: Packaging Boxes

  • Step6:bar-code shipping tag

    Step6: Bar-Code Shipping Tag

All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

Jotrin ESD packing


1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that ATMEGA644P-20AU is the original manufacturer or agent of MICROCHIP?
We have a professional business development department to strictly test and verify the qualifications of MICROCHIP original manufacturers and agents. All MICROCHIP suppliers must pass the qualification review before they can publish their ATMEGA644P-20AU devices; we pay more attention to the channels and quality of ATMEGA644P-20AU products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of ATMEGA644P-20AU chips? Including MICROCHIP original factory information, 8-bit Microcontrollers - MCU application, ATMEGA644P-20AU pictures?
You can use Jotrin's intelligent search engine, or filter by MIC MCU category, or find it through Microchip Technology, Inc Information page.
Q: Are the MICROCHIP's ATMEGA644P-20AU price and stock displayed on the platform accurate?
The MICROCHIP's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for ATMEGA644P-20AU, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
Q: Can I place an order offline?
Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
Q: What forms of payment can I use in Jotrin?
TT Bank, Paypal, Credit Card, Western Union, and Escrow is all acceptable.
Q: How is the shipping arranged and track my package?
Customers can choose industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail.
Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of ATMEGA644P-20AU?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the ATMEGA644P20AU we delivered, we will accept the replacement or return of the ATMEGA644P-20AU only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of ATMEGA644P-20AU.
(3)The ATMEGA644P-20AU is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
Q: How to contact us and get support, such as ATMEGA644P-20AU datasheet pdf, ATMEGA644 pin diagram?
Need any After-Sales service, please feel free contact us:

Microchip Technology, Inc

Microchip Technology Inc. is a leading manufacturer of microcontroller and analog products, providing low-risk product development, lower total system cost, and faster time to market for thousands of diverse customer applications worldwide. Microchip offers outstanding technical support along with d...
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