SNAU293 May   2024 LMX1860-SEP

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Setup
      1. 2.1.1  Evaluation Setup Requirement
      2. 2.1.2  Connection Diagram
      3. 2.1.3  How to Enable Full SPI Control
      4. 2.1.4  Power Requirements
      5. 2.1.5  Pin Mode Strapping
      6. 2.1.6  Reference Clock
      7. 2.1.7  Output Connections
      8. 2.1.8  Header Information
      9. 2.1.9  Default Configuration
      10. 2.1.10 How to Generate SYSREF
      11. 2.1.11 Multiplier Mode Example
      12. 2.1.12 Divider Mode Example
      13. 2.1.13 Hybrid Mode: SPI and Pin Mode
  8. 3Software
    1. 3.1 Software Installation
    2. 3.2 Software Description
    3. 3.3 USB2ANY Interface
  9. 4Implementation Results
    1. 4.1 Buffer, Divider, and Multiplier Modes
    2. 4.2 SYSREF Generation
    3. 4.3 SYSREF Delay Generators
  10. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 PCB Layout
    3. 5.3 PCB Layer Stack-Up
    4. 5.4 Bill of Materials
  11. 6Additional Information
    1. 6.1 Troubleshooting Guide
      1. 6.1.1 General Guidance
      2. 6.1.2 If Output Is Not Seen on CLKOUT
      3. 6.1.3 If Device Features Are Not Active
      4. 6.1.4 If Multiplier Frequency Is Not Accurate
      5. 6.1.5 If Divider Frequency Is Not Accurate
      6. 6.1.6 If SYSREF Is Not Observed
    2. 6.2 Trademarks

2.1.13 Hybrid Mode: SPI and Pin Mode

Make sure that no shorts are connected to either GND or VCC on any of the pin mode headers. Once the user has verified that no pins have been shorted and the threat of destroying the IO expander or MCU has been eliminated, then provide power using any of the four scenarios described Table 3-7. Current draw must be less than 1A after power is applied.

Next, the user must configure the IO expander. This is done by pressing the Configure Driver button in the GUI under the light green PIN MODES section.

LMX1860SEPEVM Configuration of TCA9535 Figure 2-5 Configuration of TCA9535

Successful configuration of the IO expander results in a TCA9535 one-time configuration complete. Re-run if USB2ANY is disconnected shown in the message window.

The user is now able to change the states of the pin mode headers via the IO expander by pulling pins either LOW or HIGH directly without the need of a physical short.

  • Output Enable and Device mode options.
LMX1860SEPEVM Pin Mode Options Figure 2-6 Pin Mode Options
  • RF output power settings for all CLKOUTx.
LMX1860SEPEVM pinPWRSEL Figure 2-7 pinPWRSEL
  • Chooses the corresponding divider value when in divider mode or multiplier value in multiplier mode.
LMX1860SEPEVM pinDIVSEL Figure 2-8 pinDIVSEL