TUSB8020 SMBus register configuration details

Edmund Pirali99

We have a TUSB8020 connected to Keystone and configured as SMBus (does not load configuration from I2C ROM). The host will need to configure or at least clear the cfgActive in register F8h. But I can find absolutely nothing in the document about the read/write protocol for the device. I am NOT talking about SMBus protocol, rather the device. For example are registers written by a sequence like:

So an SMBus write with 2 bytes? What would be the "command code" as per SMBus? Or is it a block write with all registers to 0xA required?

Essentially can you please give me an EXACT example of what needs to be sent to the device to program a register?

Thanks and this really should be in the product datasheet.

over 9 years ago

0 Elias Villegas M. over 9 years ago

TI__Guru* 76130 points

Hello,
You are correct, you can just follow the SMBus spec.

You have to do send two instructions for let's say a write cycle:
1. <dev address> <register offset>
2. <dev address> <payload>

The above two instructions will write the "payload" to the "register offset" address.

It works the same way for a read cycle.
Regards

0 Edmund Pirali99 over 9 years ago in reply to Elias Villegas M.

Intellectual 300 points

Thank you, we actually just went ahead and tried and it worked. But this is useful in confirmation and for others who may have same question. It may be a good idea to suggest it be added to the data sheet.

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TUSB8020 SMBus register configuration details