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TL16C754C: TL16CP754C

Christian Hall
Prodigy 10 points
Part Number: TL16C754C
Other Parts Discussed in Thread: TL16C754B,

Tool/software:

A Quad UART IC (U9), part number TL16CP754CIPM, is being used to send information to two separate ICs (U7 & U11). However, the information being sent to U11 from RXB/TXB is incorrect. Using an oscilloscope, the signal read from TXB seems to be at a much larger frequency than that of the signal read at TXA. The signal at TXA is 100% correct.

The PCB also has two LEDS connected to the UART IC. Each LED shows if each IC receiving information is connected, however, only 1 ever flash insinuating an issue between the UART IC and U11.  The LED connected to DTRC is not lighting up as it should either.

Here is the schematic for the UART interface. The signal sent through TXB is currently having issues as well as the LED connected to DTRC. The purpose of this interface is to send the same information from IC U9 to both IC U7 and IC U11.  Any help or insight would be much appreciated.

  • 0
    TI__Guru 72711 points

    Hi Christian,

    I'm working with McCabe on this in this thread:  

    TL16C754C: TXB Output Problem
    Part Number: TL16C754C Other Parts Discussed in Thread: TL16C754B , Tool/software: Hello, We recently swapped out TL16C754B with TL16C754C on one of our PCBs. As none of the registers changed between…
    By in Interface > Interface forum
    11 replies
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    I've checked the schematic that you provided and I don't initially see any redflags. 

    Christian Hall said:
    The LED connected to DTRC is not lighting up as it should either.

    You might want to probe this node, it might be possible that the DTRC pin is toggling on and off too quickly since the datastream on TXB is fast. I'm not sure if the human eye is able to see the LED toggleing if its above the 1kHz frequency or if it just simply not toggling at all. 

    I suggest we continue the discussion in the other thread so we can consolidate this if its ever searched for in the future. 

    -Bobby