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Part Number: TCAN337
One of our customers is in trouble with TCAN337. Could you please give me your advice or your help?
They are using the deivce for some car system. They sometimes observed RXD(No.4) terminal was kept to high level continuously. They want to know what conditions will keep RXD(No.4) terminal to high level continuously?
Is the phenomenon occured by high level of S(No.8) terminal (Silent mode)? Or is there any other condition?
Your reply would be much appreciated.
Texas Instruments | INT-TRX| Applications Engineer
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In reply to Eric Hackett:
In reply to Kazuya Nakai59:
Q1. Since the receiver driver is still enabled, the RXD timeout will still occur if the bus is held dominant for too long. However, the TXD timeout is not enabled since the TXD driver is disabled in Silent mode.
Q2. RXD will follow the bus state. So if CANH - CANL (VID) is > 0.9V, the bus is considered dominant, so RXD will be low. If CANH - CANL (VID) is < 0.5V, the bus is considered recessive and RXD will be high.
If no signal is being transmitted on the CAN bus, the RXD state will be a logic high, because the bus is in a recessive state unless a CAN node is driving a dominant signal.
Is the customer seeing the RXD pin stay high even when there are dominant bits driven on the CAN bus?
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