Why Your TPS65987DDHRSHR Is Not Connecting to USB Devices

Why Your TPS65987DDHRSHR Is Not Connecting to USB Devices

Why Your TPS65987DDHRSHR Is Not Connecting to USB Devices: Troubleshooting and Solutions

The TPS65987DDHRSHR is a USB Type-C and Power Delivery (PD) controller designed by Texas Instruments. If your device is not connecting to USB devices as expected, it could be caused by several potential issues. Below is a detailed step-by-step guide to help you identify and fix the problem.

Possible Reasons for Connection Issues:

Incorrect Firmware or Software Configuration The controller relies on correct software and firmware settings for proper operation. Incorrect configurations or outdated firmware can prevent the TPS65987DDHRSHR from recognizing USB devices. Faulty USB Cable or Port The issue may be as simple as a defective USB cable or a dirty, damaged, or poorly connected USB port. Power Delivery (PD) Negotiation Failures The TPS65987DDHRSHR uses Power Delivery (PD) protocols for communication. If there is an issue with PD negotiation, such as a mismatch in voltage or current specifications, devices may fail to connect. Improper VBUS Power Supply If the VBUS (Voltage Bus) power supply is unstable or not properly provided, the device might not power on correctly, resulting in a failure to connect. Faulty USB Type-C Connector If the USB Type-C connector is not properly aligned or the pins are worn out, the connection may fail to establish. Overvoltage or Overcurrent Protection The TPS65987DDHRSHR is equipped with protection mechanisms to prevent overvoltage or overcurrent situations. If a connected device is drawing too much power, the controller may prevent a connection to protect both the controller and the device.

Step-by-Step Troubleshooting and Solutions:

Step 1: Check for Proper Firmware and Software Configuration

What to do:

Make sure that the firmware for the TPS65987DDHRSHR is up to date. Check for updates from the manufacturer (Texas Instruments) and apply the latest version if necessary.

Verify that the software configuration (such as PD profiles) is set correctly for your specific device. Incorrect settings could prevent proper communication.

How to fix:

Use the TI GUI (Graphical User Interface) tool to configure and test the firmware settings.

Reflash the firmware if needed, and verify the correct settings for the USB connection and power delivery protocols.

Step 2: Test the USB Cable and Ports

What to do:

Inspect the USB cable for visible damage or wear.

Ensure that both the device and the host computer are using compatible USB Type-C cables and ports.

How to fix:

Try using a different USB cable to rule out the possibility of a faulty one.

Check the USB port on both the host and device to ensure they are clean and properly functioning.

Step 3: Check Power Delivery (PD) Negotiation

What to do:

PD negotiation is a key function of the TPS65987DDHRSHR. If there is an issue with PD profiles (voltage or current), the device may not establish a connection.

How to fix:

Use a PD analyzer tool to check the PD negotiation process between the devices. Look for errors like PD timeout, unsupported voltage, or unsupported current requests.

Adjust the PD profiles on the controller to match the required settings for your device.

Step 4: Verify VBUS Power Supply

What to do:

The VBUS supply must be stable for proper operation. If the power supply is unstable, the TPS65987DDHRSHR might not be able to provide adequate power to the connected USB device.

How to fix:

Check the VBUS power source with a multimeter. Ensure the voltage is within the expected range (typically 5V or higher for Power Delivery).

If necessary, replace or adjust the power supply to ensure stable VBUS power.

Step 5: Examine the USB Type-C Connector

What to do:

Inspect the Type-C connector for any misalignment, bent pins, or physical damage.

How to fix:

Gently clean the USB Type-C connector with compressed air or a soft brush to remove any dirt or debris.

If the connector is damaged, consider replacing it with a new one to ensure proper physical connection.

Step 6: Check for Overvoltage or Overcurrent Protection

What to do:

If the TPS65987DDHRSHR detects an overvoltage or overcurrent condition, it may refuse to establish a connection to protect the devices.

How to fix:

Check the power supply and connected devices for any signs of excessive power draw or malfunctioning components.

If necessary, reset the TPS65987DDHRSHR and test the connection again with devices that are known to operate within safe power limits.

Conclusion:

The TPS65987DDHRSHR not connecting to USB devices can be caused by a variety of issues, ranging from incorrect configurations and faulty hardware to power delivery or physical connection problems. By following the steps above—checking firmware, testing cables, analyzing PD negotiations, verifying VBUS power, inspecting the connector, and ensuring no overcurrent or overvoltage issues—you can systematically identify and resolve the issue.

If the problem persists after troubleshooting, you may need to consult with the manufacturer for further technical support or consider hardware replacement.