AT89C2051-24PU 8-Bit Flash 8051 Microcontroller 24MHz DIP-20

AT89C2051-24PU 8-Bit Flash 8051 Microcontroller 24MHz DIP-20 is a popular and cost-effective 8051-compatible microcontroller that delivers high-performance processing in a compact package. Microchip (formerly Atmel) designed this device for low-voltage, high-speed embedded control applications. It features 2 KB of in-system programmable Flash memory and 128 bytes of RAM, providing ample resources for many entry-level and intermediate control tasks. Consequently, this microcontroller operates up to 24 MHz, offering significantly faster execution speeds than older 8051 cores. Furthermore, its small 20-pin DIP form factor makes prototyping and small-scale production extremely straightforward, requiring minimal external circuitry to operate. Therefore, engineers widely choose the AT89C2051 for projects demanding a balance of power, simplicity, and ease of use.

Key Features:

• 8051 Instruction Set Compatible: Executes the industry-standard 8051 instruction set, ensuring wide tool support and easy migration from existing designs.
• 2 KB In-System Programmable (ISP) Flash: Provides 2 KB of non-volatile memory for program storage, allowing for flexible firmware updates and debugging.
• High-Speed Operation: Operates at a maximum clock frequency of 24 MHz, delivering fast instruction cycle times for responsive control.
• Compact DIP-20 Package: The 20-pin Dual In-line Package minimizes board space while remaining breadboard-friendly for prototyping.
• Analog Comparator: Includes a built-in analog comparator, which designers use for voltage level sensing and basic analog input functions.

Technical Specifications:

• Core Architecture: 8-bit CMOS Microcontroller (8051)
• Max Clock Frequency: 24 MHz
• Program Memory: 2 KB Flash (Endurance: 1,000 Write/Erase Cycles)
• Data RAM: 128 Bytes
• I/O Pins: 15 Programmable I/O Lines
• Timers: Two 16-bit Timer/Counters (Timer 0 and Timer 1)
• Serial Interface: UART (Universal Asynchronous Receiver/Transmitter)
• Supply Voltage (V_CC): 2.7 V to 6.0 V

Mechanical Specifications:

• Package Type: DIP-20 (PDIP, Plastic Dual In-line Package)
• Mounting: Through-Hole Technology (THT)
• Process Technology: High-Density Nonvolatile Memory CMOS Technology
• Temperature Grade: −40°C to +85°C (Industrial)

Dimensions:

• Body Length: ≈ 26.16 mm
• Body Width: ≈ 6.4 mm
• Pin Pitch (Between pins): 2.54 mm (0.1 inch)
• Row Spacing (Between rows): 7.62 mm (0.3 inch)
• Weight: ≈ 2.5 g

Pinout and Wiring:

• VCC (Pin 20): Connect the positive power supply (2.7 V to 6.0 V).
• GND (Pin 10): Connect the circuit ground.
• XTAL1 / XTAL2 (Pins 18, 19): Connect an external crystal or ceramic resonator (up to 24 MHz) to these pins to provide the system clock.
• P1.0 to P1.7 (Pins 12-19): Port 1 pins, which serve as versatile 8-bit parallel I/O, UART pins, and the analog comparator input/output. Note: XTAL1/XTAL2 are multiplexed with P1.0/P1.1.
• P3.0 to P3.7 (Pins 2-9): Port 3 pins, serving as 8-bit parallel I/O and holding the alternate functions for the two external interrupts and timer inputs.
• RST (Pin 1): The Reset pin. Apply a high pulse here to reset the device.

Datasheet Reference:

• Download Microchip AT89C2051 Datasheet

Commonly Used in:

• Educational Kits: Students and hobbyists widely use it as a foundational microcontroller for learning 8051 architecture and assembly language.
• Simple Control Panels: In essence, it drives small displays, keypads, and control logic in simple user interfaces and appliances.
• Data Acquisition: Collecting and pre-processing sensor data in low-volume, specialized instrumentation.

Applications:

• Timers and Counters: Implementing precise delay functions and frequency counting in industrial settings.
• Security Systems: Handling basic alarm logic, access control keypads, and door interlocks.
• Battery-Powered Devices: Its low power consumption and wide voltage range make it suitable for various portable electronic gadgets.

Equivalent Models:

• AT89C4051: This is a directly compatible sibling chip that offers double the Flash memory (4 KB) in the same DIP-20 package.
• STC89C52RC: A modern, high-speed 8051 core microcontroller often used as a feature-rich, low-cost alternative.
• AT89S52: While in a larger DIP-40 package, this chip offers similar 8051 functionality but includes more I/O ports and features.

Package Includes:

• 1 x AT89C2051-24PU 8-Bit Flash 8051 Microcontroller DIP-20