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TPS92662A-Q1: numbers of 92662A on a single uart-can bus

Part Number: TPS92662A-Q1


I'm using TPS92662A for headlamp design,  and there are totall 15 devices of TPS92662A on a single uart-CAN bus.

I got a question of the relations between the numbers of TPS92662A on a single bus and the baud rate of the communication speed, also and the required perioud time that  read all the device. 

For example: 

   1)  there are 8 devices on a single uart-can bus, and the baud rate is 500k,  each 5ms to read all the device.

If the numbers of device increase to 15 or more. the baud rate and the read pierioud can keep the same with the example or need to be increased too?  Could you please give me some formula to calculate or some rules to follow?