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Part Number: TS3A4751
My customer has met some issue using TS3A4751. The simplified circuit is as following:
All the NOx are connected together and pulled up to 3.3V through a 100Ohm resistor.
Below are the waveforms that captured with all INx pulled to low. CH1 is NO1, CH2 is COM1.
Normally, all COMx should be low as all INx are low no mater what signal is on NOx.
Using a larger pull up resistor, like 1kOhm will have lower COM output but customer can only accept 100Ohm pull up due to the heavy capacitive load.
Could you help to advise what may cause this issue?
Thanks and best regards,
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In reply to Adam Torma:
Hi Adam, According to customer, the test is down with COM floating(nothing is connected to COM). In real application, COM will connect to a BUS. For the IN pins, they are controlled by MCU I/O and kept low during the whole test. Best regards, Victor
In reply to Victor Chen_HK:
If the COM node is floating it is hard to predict the behavior. It looks like there is some paracitic leakage current passing through the switch and slowly charging up the floating node and then a slow discharge when the signal stops.
What is the result if you have a weak pull up or pull down on the COM pin instead of it being floating? I suspect the bus will remain high or low and not be influenced by the MCU signal when the TS3A4751 is Hi-Z.
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