SNAU288 December   2023 LMX1906-SP

 

  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
        1. 2.1.2.1 How to Enable Full SPI Control
      3. 2.1.3 Power Requirements
      4. 2.1.4 Pin Mode Strapping
      5. 2.1.5 Reference Clock
        1. 2.1.5.1 Output Connections
        2. 2.1.5.2 Header Information
        3. 2.1.5.3 Default Configuration
        4. 2.1.5.4 How to Generate SYSREF
        5. 2.1.5.5 Multiplier Mode Example
        6. 2.1.5.6 Divider Mode Example
        7. 2.1.5.7 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
      1. 5.2.1 PCB Layer Stack-Up
    3. 5.3 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

2.1.5.7 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 approximately 0.9 V 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.

GUID-20231113-SS0I-R7QC-0D3L-PV3Z6MG9MQH9-low.svg Figure 2-8 Config of TCA9535

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

GUID-20231113-SS0I-KRV7-PF1J-18G90CKV6QZW-low.svg Figure 2-9 Successful Configuration of TCA9535

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.

CLKx_EN and Device mode options.

GUID-20231113-SS0I-RKBW-G2Q4-1QBWGG0H48GW-low.svg Figure 2-10 Pin Mode Options

Chooses RF output power for all CLKOUTx.

GUID-20231113-SS0I-BDV5-33PB-ZSF2HW92QHXR-low.svg Figure 2-11 pinPWRSEL

Chooses the corresponding divider value when in divider mode or multiplier value in multiplier mode.

GUID-20231113-SS0I-3DF8-W8NR-TL24H44HHMPS-low.svg Figure 2-12 pinDIVSEL