MLAB
Module
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I2CIO01

GPIO expander with I²C interface; 16-bit I/O, configurable ports, polarity inversion.

I2CIO01A

This is an open-source hardware design, one of the modules from the MLAB labolatory system.

I2CIO01A - I2C IO Expander

I2CIO01A

Overview

The I2CIO01 module is a GPIO expander designed for operation in the range of 1.65 to 5.5 V. It provides general-purpose remote I/O expansion via the I²C interface. The module comprises two 8-bit Configurable, Input Ports, Output Port, and Polarity Inversion registers.

Features

  • Operating Voltage: 1.65 to 5.5 V
  • Interfaces: I²C, up to 400 kHz
  • GPIO Ports: 16-bit expansion using either TCA6416A or TCA9535 IC
  • Address Selection:
  • TCA6416A: 2 I2C addresses, includes a reset pin
  • TCA9535: 4 I2C addresses
  • Interrupt Capabilities: Both ICs support interrupt output
  • Package Dimensions: 40.13 x 40.13 x 16 mm

Technical Specifications

Parameter Value Note
Power Supply Max. 3.6 V
ICs Used TCA6416A or TCA9535
Interface bus I²C Frequency up to 400 kHz
Main Usage I²C IO expander
Dimensions 40.13 x 40.13 x 16 mm Height above the baseboard

Design Details

IC Selection variants

  • TCA6416A:
  • Populate RES, do not populate ADR X
  • Jumper to Vccp and VDD
  • TCA9535:
  • Do not populate RES, populate ADR X
  • Jumper to Vccp and VDD

Schematic and Layout

The module's design and layout files can be found in the hw/sch_pcb directory. The board is designed using KiCad.

Bill of Materials

Designator Type Package Quantity
J3 JUMP_3X2 Pin_Header_Straight_2x03 1
R1, R2, R3, ... 10k SMD-0805 13
U1 TCA6416A TSSOP-28 1
J8, J5 CONN1_2 Pin_Header_Straight_1x02 2
P1, P2, P3, P4 MountingHole_3mm 4
J1 JUMP_2X2 Pin_Header_Straight_2x02 1
J2 JUMP_5X2 Pin_Header_Straight_2x05 1
J6, J7 JUMP_8X2 Pin_Header_Straight_2x08 2
J4, J9 CONN_2 Pin_Header_Straight_1x02 2
C1 10uF SMD-0805 1
C2 100nF SMD-0805 1
D1 BZV55C-3,6V Diode-MiniMELF_Standard 1

Assembly and Testing

  1. Assembly: Follow the provided schematic and BOM for assembling the module.
  2. Initial Inspection: Perform a visual inspection to ensure no shorts on the power supply.
  3. Testing: No additional setup is required beyond the initial inspection.

For more detailed information on each component, please refer to their respective datasheets:

Contributing

Contributions are welcome! Please fork this repository and submit a pull request with your changes.

Contact

For more information, visit the MLAB website or contact us at support@mlab.cz.