AVR ISP 10 Pin to 6 Pin Adapter Board

AVR ISP 10 Pin to 6 Pin Adapter Board is an essential utility tool that bridges the gap between older 10-pin In-System Programming (ISP) programmers and modern target boards utilizing the smaller 6-pin ISP header. This compact adapter ensures seamless compatibility and flexibility during the development and production programming of Atmel/Microchip AVR microcontrollers. Consequently, you eliminate the need for custom cables or complex wiring when moving between different generations of AVR programmers or target hardware. Furthermore, the board maintains the correct signal mapping, including SCK, MISO, MOSI, RESET, VCC, and GND, ensuring reliable and error-free firmware flashing. Therefore, every developer or hobbyist working with a diverse range of AVR hardware should keep this adapter in their toolkit to simplify connectivity.

Key Features:

• Bidirectional Compatibility: Facilitates programming using both 10-pin and 6-pin AVR ISP cables, ensuring compatibility across a wide range of hardware.
• Accurate Signal Mapping: The board correctly translates the signal pins, eliminating potential wiring errors and protecting both the programmer and the target MCU.
• Compact Form Factor: Designed as a small PCB, the adapter minimizes bulk and easily connects directly between the programmer cable and the target board.
• Through-Hole Connectors: Utilizes standard 2×5 (10-pin) and 2×3 (6-pin) IDC box headers, ensuring a secure and reliable connection with shrouded cables.
• Integrated Indicator: Includes an optional power or status LED (depending on revision), providing visual confirmation of board connection and power.

Technical Specifications:

• Supported Protocols: AVR In-System Programming (ISP) / Serial Programming Interface (SPI)
• Input Connector: 10-Pin IDC Box Header (2×5 pin, 2.54 mm pitch)
• Output Connector: 6-Pin IDC Box Header (2×3 pin, 2.54 mm pitch)
• Voltage Compatibility: Fully compatible with target voltages from 3.3 V to 5 V (TTL/CMOS logic levels).
• Max Current Rating: Depends on the connector and cable, typically rated for ≥ 1 A per pin.

Mechanical Specifications:

• Board Material: FR-4 PCB
• Connector Type: Shrouded IDC Box Headers
• Mounting: Direct cable/board connection (no fixed mounting required)

Dimensions:

• PCB Length: ≈ 35 mm
• PCB Width: ≈ 20 mm
• Weight: ≈ 5 g (Extremely lightweight)
• Thickness: Standard 1.6 mm PCB

Pinout and Wiring:

• Signal Mapping: The adapter directly maps the essential ISP signals, ensuring that Pin 1 on the 10-pin header connects to Pin 1 on the 6-pin header, and so on.
• 10-Pin ISP Input: Pin 1: MISO; Pin 2: VCC; Pin 3: SCK; Pin 4: MOSI; Pin 5: RESET; Pin 6: GND. (Pins 7, 8, 9, 10 are typically unused or are additional GND/VCC and are correctly managed by the adapter).
• 6-Pin ISP Output: Pin 1: MISO; Pin 2: VCC; Pin 3: SCK; Pin 4: MOSI; Pin 5: RESET; Pin 6: GND.
• Wiring Note: Always ensure the red stripe on the IDC ribbon cable aligns with Pin 1 (often marked by a small arrow or square pad) on both the programmer and the target adapter.

Datasheet Reference:

• Download AVR ISP Connection Standards Reference (AN2533)

Commonly Used in:

• AVR Development Kits: Essential for connecting programmers like AVRISP mkII or USBasp (often 10-pin) to modern boards (often 6-pin).
• Arduino Programming: Facilitates bootloader burning and direct chip programming for Arduino boards that expose the 6-pin header.
• Custom PCB Prototyping: Ideal for manufacturers who maintain older 10-pin equipment but produce new boards with space-saving 6-pin headers.

Applications:

• Firmware Upload: Used to load new firmware onto AVR microcontrollers (ATmega, ATtiny series).
• Bootloader Burning: Essential for restoring or installing bootloaders on various development boards.
• Fuse Bit Setting: Allows low-level configuration of the microcontroller’s internal clock source and behavior.

Equivalent Models:

• Any ISP 10-to-6 Pin Converter: Functional equivalents are sold by dozens of suppliers; look for boards guaranteeing the correct ISP pin mapping.
• USBasp or AVRISP mkII Cable Adapters: Many programmers include a detachable adapter; however, this standalone board offers a more robust solution.
• DIY Ribbon Cable: While users can manually create one, this PCB provides a reliable and mass-produced alternative.

Package Includes:

• 1 x AVR ISP 10 Pin to 6 Pin Adapter Board