SCPS299B May   2025  – July 2026 TXE8124-Q1

ADVANCE INFORMATION  

  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 SPI Bus Timing Requirements
    8. 5.8 Switching Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 I/O Port
      2. 7.3.2 Interrupt Output (INT)
      3. 7.3.3 Reset Input (RESET)
      4. 7.3.4 Bus Hold
      5. 7.3.5 Fail-safe Mode
      6. 7.3.6 Software Reset Call
      7. 7.3.7 Daisy Chain
      8. 7.3.8 Multi Port
      9. 7.3.9 Feature Register Mapping
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power-On Reset
    5. 7.5 Programming
      1. 7.5.1 SPI
      2. 7.5.2 SPI Data Format
      3. 7.5.3 Burst Mode
      4. 7.5.4 SPI Write
      5. 7.5.5 SPI Read
      6. 7.5.6 SPI Daisy Chain
    6. 7.6 TXE8124 Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power-On Reset Requirements
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2 Typical Application

Figure 8-1 shows an application in which the TXE8124-Q1 devices can be used.


TXE8124-Q1 Typical Application Schematic
Note: P0.0 – P0.7, P1.0, P1.1, P2.2 – P2.7, are configured as inputs.
Note: P1.2 – P1.7, P2.0, P2.1, are configured as outputs.
Note: Resistors are required for inputs (on P-port) that can float. If a driver to an input will never let the input float, a resistor is not needed. Outputs (in the P-port) do not need pullup resistors.
Figure 8-1 Typical Application Schematic

The following shows a sample application code example that can be used for accessing the device.

uint32_t SPIExchangeData(uint32_t transmitData)
{
   uint32_t receiveData=0x0;

   for(int i = 23; i >= 0; i--)
   {
        // Shift out MSB first
        SPISendBit((transmitData >> i) & 0x01);
        receiveData |= SPIGetBit() << i;
   }

   return(receiveData);
}

uint32_t SPITransmitReceive(uint32_t RnW, uint32_t regPointer, uint32_t multiPort, uint32_t transmitData)
{
    uint32_t regWrData=0x0;
    uint32_t regRdData=0x0;

    regWrData = RnW          << 23 | \
                regPointer   << 12 | \
                mulitPort    << 8  | \
                transmitData << 0;

    regRdData = SPIExchangeData(regWrData);

    return(regRdData);
}