Part Number: CDCEL913
We received the following question from a customer regarding the CDCEL913 and would like to ask for TI’s support in clarifying the possible cause.
Observed issue
- The I2C address of the CDCEL913 unexpectedly changes from the default 0x65 to 0x64.
- The timing of this address change appears to be related to the link status of an FPD-Link III connection using DS90UB913A and DS90UB914, even though these circuits are physically independent.
- The observed address depends on the presence or absence of the FPD-Link III cable/link:
- With link/cable condition changed, the CDCEL913 address changes accordingly.
- After link-up, the address changes to 0x64.
- In one out of five units, once the address changes to 0x64 after link-up, it remains 0x64 even after the link is disconnected.
- In that unit, the address returns to 0x65 only after power cycling.
Additional information
- The I2C bus for the DS90UB913A/DS90UB914 and the I2C bus for the CDCEL913 are on separate, independent buses.
- Register address 0x01, bits [1:0], remain “01” and do not change.
Question Is there any possibility that internal or non-exposed I/O pads inside the CDCEL913 could be affected by external noise, causing unintended behavior such as an I2C address change?
Please also refer to the attached block diagram for the system configuration.
Best Regards,
Ryusuke
