TLIN1022A-Q1: Interface forum

Sebin,

Good question. For a 2-channel device like TLIN1022A-Q1, each LIN pin operates as a separate LIN transceiver. So from your setup, you're basically creating a very small 2-node bus, where you might consider LIN1 as the commander node and LIN2 as the responder node (though not really relevant since there is no cable involved). You can certainly test this way without issue.

However, when you use the term "loopback," generally people consider this to refer to cases where there is an input signal on TXD, and then the resulting signal on the same RXD is measured, which represents loopback within the same transceiver. In the case you described above, even though LIN1 and LIN2 (and also TXD1/TXD2/RXD1/RXD2) are in the same integrated circuit, they operate as two separate nodes/transceivers.

Best,

Danny