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Miscellaneous Board Pinout Reference

Find miscellaneous development board pinouts in one place. View GPIO layouts, power pins, communication interfaces, expansion headers, and connector pin configurations for various embedded development boards.

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Sony CXD5602 Multi-Core Board
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Input Parameters Specification

Pin/Lead Multiplexing SoC register configurations that map physical pins dynamically to UART, SPI, I2C, DAC, or SWD debug lines.
Operational Voltage Tolerances Input and output limits (e.g., 1.8V vs 3.3V) that require step-down level shifters to transition signals safely.
Integrated Bus Interfaces High-frequency communication pathways routed for high-speed serial protocols.
Power Sourcing Schemes Power routing configurations allocating load paths across USB, battery inputs (VBAT), and regulated pin rails.

Practical Operational Examples

Configuring Debug Port on Spresense

Target pins 18 and 19 using a 1.8V FTDI level converter to establish serial terminal debug consoles safely.

Adding I2C Bus Pull-Ups

Place 4.7k-ohm pull-up resistors between the SDA/SCL lines and the logic voltage rail to prevent serial errors.

F7 Analog Measurements

Connect analog signals to the A00-A05 pins, ensuring input voltages stay below the configured AREF reference level.

Programming via CMSIS-DAP

Connect SWDIO, SWCLK, RESET, and GND lines directly to target ARM chips to enable real-time debugging.

Logic Level & Hardware Protection

Development boards operate on distinct core microcontrollers (such as STM32, CXD5602, or LPC11U35) and FPGAs. Because these silicons are optimized for specialized tasks, they use varying internal logic levels—typically 1.8V or 3.3V. Connecting high-voltage outputs to low-voltage pins will quickly damage internal junctions.

Tip: Always verify the logic levels of your sensors and development boards before connecting them. When in doubt, use an active level shifter.

Formulas & Hardware Calculations

Series Current Limiting: R_series = (V_output - V_load) / I_target (Keep below 4-8mA per pin)
I2C Pull-Up Range: R_min = (V_logic - V_low) / I_sink, preventing overcurrent drain on open-drain pins.
ADC Value Translation: V_measured = (ADC_reading / Max_ADC_steps) × AREF_voltage (Maps digital values to analog inputs)

Step-by-Step Selection Walkthrough

Choose the target specialty board using the select menu at the top of the page.
Review the updated standard card showing the board's class and primary chipset.
Study the customized 2D vector layout showing board structure and pin headers.
Consult the exhaustive connection tables below the diagram to locate specific peripheral pin assignments.

About This Reference Guide

Your direct lookup path for specialized and custom IoT development boards.

This reference index consolidates pin configurations, expansion header maps, and line assignments for Sony Spresense, Pyboard, Mojo, Meadow F7, and Google Coral platforms.

Finding accurate pin layouts is essential for firmware developers, IoT system architects, and custom hardware builders. Precise pin alignments prevent hardware conflicts, communication dropouts, and permanent board damage from short-circuits.

Always verify operating voltages (especially the 1.8V limits) before constructing custom connections. Correct connection paths preserve performance and safety.

Specialty SystemsHigh-end boards like Sony Spresense, featuring multicore computing.
FPGA PlatformsXilinx Spartan-6 based hardware layouts (Mojo V3).
Language EnginesMicroPython (Pyboard) and C# (.NET Meadow F7) board specs.
AI Edge CoresGoogle Coral Dev Board featuring onboard Edge TPUs.

Frequently Asked Questions

1. Are Sony Spresense GPIO pins 3.3V or 5V tolerant?

No, Spresense IO pins operate strictly at a 1.8V threshold. Exposing any GPIO, SPI, or UART pins to 3.3V or 5V logic sources without a 1.8V level shifter will cause hardware failure.

2. How do I change the SPI speed on the Pyboard v1.1?

You can adjust the clock speed directly in MicroPython during SPI object initialization by setting the `baudrate` parameter (e.g., `spi = SPI(1, SPI.MASTER, baudrate=600000)`).

3. Can I power the Mojo V3 with more than 5V?

Yes, you can apply between 5V and 12V DC directly to the RAW_VIN pin, which routes to the on-board switching regulators.

4. Why do I2C SDA and SCL pins require external pull-up resistors?

Most microcontrollers configure their I2C pins as open-drain outputs, requiring external resistors (typically 4.7k ohms) to pull the signal line up to the VCC rail.

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