SCPS314 December   2025 TCA9536-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 I2C Bus Timing Requirements
    8. 5.8 Switching Characteristics
    9. 5.9 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 I/O Port
      2. 7.3.2 P3 or Interrupt (INT) Output
      3. 7.3.3 Pull-up Disable Functionality
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power-On Reset
      2. 7.4.2 Powered-Up
    5. 7.5 Programming
      1. 7.5.1 I2C Interface
        1. 7.5.1.1 Writes
        2. 7.5.1.2 Reads
      2. 7.5.2 Software Reset Call
    6. 7.6 Register Maps
      1. 7.6.1 Device Address
      2. 7.6.2 Control Register and Command Byte
      3. 7.6.3 Register Descriptions
  9. 8 Application Information
    1. 8.1 Typical Application
      1. 8.1.1 Design Requirements
        1. 8.1.1.1 Minimizing ICC When I/Os Control LEDs
      2. 8.1.2 Detailed Design Procedure
      3. 8.1.3 Application Curves
  10. 9 Power Supply Recommendations
    1. 9.1 Power-On Reset
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

3 Description

The TCA9536-Q1 is a 4-bit I/O expander for the I2C bus and is designed for 1.65V to 5.5V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface.

The system controller can enable the I/Os as either inputs or outputs by writing to the I/O configuration register bits. The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. There is an additional special function register that can be used to disable the internal pull-up resistors and P3 override to an INT output.

The TCA9536-Q1 open-drain interrupt output (when P3 is configured as INT in the special function register) is activated when any input differs from its corresponding Input Port register state and is used to indicate to the system controller that an input state has changed.

The system processor can reset the TCA9536-Q1 in the event of a timeout or other improper operation by using an I2C soft reset command, which puts the registers in their default state.

Package Information
PART NUMBERPACKAGE(1)BODY SIZE (NOM)
TCA9536-Q1X2SON (8)1.35mm × 0.80mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
TCA9536-Q1