CARPROG A1 Adapter CAN transceiver A82C250

[theislandhub]

Hi All,

I Have been looking into various issues with the A1 adapter and I have found another CAN transceiver and I am now wondering is it a suitable replacement?

The existing chip is the A82C250 https://www.nxp.com/docs/en/data-sheet/PCA82C250.pdf

and I am interested in replacing it with the TJA1050 https://www.nxp.com/docs/en/data-sheet/TJA1050.pdf

The main difference I see is on pin 8, On the A82 its a sloping resistor and on the TJA its a function selector.

Has any one tried swapping out the A82 and if not does any one know if it will work?

[theislandhub]

Reading a bit more reveals the following:

TJA1050 - Control pin S allows two operating modes to be selected: high-speed mode or silent mode.
The high-speed mode is the normal operating mode and is selected by connecting pin S to ground. It is the default
mode if pin S is not connected. However, to ensure EMI performance in applications using only the high-speed
mode, it is recommended that pin S is connected to ground.
In the silent mode, the transmitter is disabled. All other IC functions continue to operate. The silent mode is
selected by connecting pin S to VCC and can be used to prevent network communication from being blocked, due
to a CAN controller which is out of control.

So presumably, You would be able to change the CAN transceiver. By removing the 103 resistor and placing a small wire from the pin 8 side of the removed resistor to the common of an on-off-on switch mounted on the side of the OBDII connector, One way to ground for High Speed Communication and the other to Vcc for Silent mode (diagnostics only)?