SCPS193D July   2010  – January 2023 TCA6424A

PRODUCTION DATA  

  1. 1 Features
  2. 2 Description
  3. 3 Revision History
  4. 4 Description (continued)
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings (1)
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C Interface Timing Requirements
    7. 6.7 Reset Timing Requirements
    8. 6.8 Switching Characteristics
    9. 6.9 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
      1. 8.1.1 Voltage Translation
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 I/O Port
      2. 8.3.2 I2C Interface
    4. 8.4 Device Functional Modes
      1. 8.4.1 Device Address
    5. 8.5 Programming
      1. 8.5.1 Power-On Reset
      2. 8.5.2 Reset Input ( RESET)
      3. 8.5.3 Interrupt Output ( INT)
      4. 8.5.4 Bus Transactions
        1. 8.5.4.1 Writes
        2. 8.5.4.2 Reads
    6. 8.6 Register Maps
      1. 8.6.1 Control Register and Command Byte
      2. 8.6.2 Register Descriptions
  9. 9 Application and Implementation
    1. 9.1 Typical Application
      1. 9.1.1 Detailed Design Procedure
        1. 9.1.1.1 Minimizing ICC When I/Os Control LEDs
    2. 9.2 Power Supply Recommendation
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
      1.      Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.5.4.1 Writes

Data is transmitted to the TCA6424A by sending the device address and setting the least-significant bit (LSB) to a logic 0 (see Figure 8-6 for device address). The command byte is sent after the address and determines which register receives the data that follows the command byte. There is no limitation on the number of data bytes sent in one write transmission.

The twelve registers within the TCA6424A are grouped into four different sets. The four sets of registers are input ports, output ports, polarity inversion ports and configuration ports. After sending data to one register, the next data byte is sent to the next register in the group of 3 registers (see Figure 8-7 and Figure 8-8). For example, if the first byte is send to Output Port 2 (register 6), the next byte is stored in Output Port 0 (register 4).

There is no limitation on the number of data bytes sent in one write transmission. In this way, each 8-bit register may be updated independently of the other registers.

Figure 8-7 Write to Output Port Register

Figure 8-8 Write to Configuration or Polarity Inversion Registers