Boardoza TPT29545 Breakout Board

The Boardoza TPT29545 Breakout Board is a compact and efficient 4 bidirectional I²C bus switch and expander solution designed for systems that require multiple identical I²C devices operating on the same master bus. Based on the 3PEAK TPT29545 IC, this board divides a single I²C interface into four independent channels, allowing address-conflicting sensors and modules to coexist without communication issues.

The board supports Standard Mode (100 kHz) and Fast Mode (400 kHz) I²C communication while maintaining signal integrity through optimized PCB routing and low-capacitance traces. Each channel can be individually selected through software commands, making this breakout board ideal for industrial automation, robotics, environmental monitoring, embedded control systems, and complex multi-sensor applications where flexible I²C bus management is required.

Front Side	Back Side

---

Key Features

• I²C Bus Expansion: Allows one I²C bus to communicate with four independent channels.
• Address Conflict Solution: Enables multiple identical I²C sensors or modules with the same slave address to operate simultaneously.
• Bidirectional I²C Switching: Supports seamless two-way communication.
• Independent Channel Control: Each channel can be enabled or disabled individually through I²C commands.
• Interrupt Management: Includes four interrupt inputs and one shared interrupt output for efficient event handling.
• Wide Voltage Compatibility: Operates from 2.3V to 5.5V, suitable for both low-power and industrial systems.

---

Technical Specifications

Model: TPT29545
Manufacturer: Boardoza
Manufacturer IC: 3PEAK
Functions: 4 Independent Bidirectional I²C Bus Switch / Expander
Interface: I²C
I²C Modes Supported: Standard Mode, Fast Mode
Clock Frequency: Up to 400kHz
Input Voltage: 2.3V – 5.5V
Operating Current: Up to 30μA
Address Selection: 2 Address Pins (A0, A1)
Interrupt Support: 4 Interrupt Inputs, 1 Shared Interrupt Output
Reset Pin: Active-Low Reset Input
Operating Temperature: -40°C to +85°C
Board Dimensions: 40mm x 20mm

---

Board Pinout

( J1 ) I²C Channels 0 and 1

Pin Number	Pin Name	Description
1	SCL1	I²C Clock Channel 1
2	SDA1	I²C Data Channel 1
3	/INT1	Active-Low Interrupt Input Channel 1
4	SCL0	I²C Clock Channel 0
5	SDA0	I²C Data Channel 0
6	/INT0	Active-Low Interrupt Input Channel 0

( J2 ) Main Control Connector

Pin Number	Pin Name	Description
1	VCC	Power Supply Input
2	/INT	Active-Low Shared Interrupt Output
3	SCL	Main I²C Clock Input
4	SDA	Main I²C Data Input
5	A0	I²C Address Selection Input 0
6	A1	I²C Address Selection Input 1
7	/RESET	Active-Low Reset Input
8	GND	Ground

( J3 ) I²C Channels 2 and 3

Pin Number	Pin Name	Description
1	SCL3	I²C Clock Channel 3
2	SDA3	I²C Data Channel 3
3	/INT3	Active-Low Interrupt Input Channel 3
4	SCL2	I²C Clock Channel 2
5	SDA2	I²C Data Channel 2
6	/INT2	Active-Low Interrupt Input Channel 2

---

I²C Address Configuration

A1	A0	I²C Address
0	0	0x70
0	1	0x71
1	0	0x72
1	1	0x73

---

Board Dimensions

---

Step Files

Boardoza TPT29545.step

---

Datasheet

TPT29545 Datasheet.pdf

---

Version History

• V1.0.0 - Initial Release

---

Support

• If you have any questions or need support, please contact [email protected]

---

License

This repository contains both hardware and software components:

Hardware Design

All hardware design files are licensed under Creative Commons Attribution-ShareAlike 4.0 International License.

Software/Firmware

All software and firmware are licensed under BSD 3-Clause License.