Hi,
We have a 1V8 controller that needs level translation to talk to a 1V2 slave device via SPMI. Would LSF0204 be suitable for this application? We prefer to use this device as there is a couple of open-drain signals on board that we would also like to use it with. Thanks.
Hey Thai,
The LSF0204 is compatible with SPMI signals- but note that the desired data rate is entirely dependent on the external pullup resistors + capacitive load surrounding the device (including connectors and PCB traces). You can reference section 10.2.1.1 of the datasheet as well as the below for design requirements.
Regards,
Jack
Hi Jack,
Thanks for the confirmation. Further digging into the docs slva675b: https://www.ti.com/lit/an/slva675b/slva675b.pdf?ts=1697685196165 - I found that whenever a port of LSF0204 is used as output or bidirectional port, a pullup resistor is required, even when the port connected to a push-pull port of another device.
That means for my SPMI SCL and SDA signals, even though both are push-pull, I would need a pullup on the output side of SCL and one pullup on each side of SDA (since it's bidirectional), and pullup values are calculated from the Rpu formula.
This seems a bit complicated as I would expect no pullup required for push-pull signals. Can you please confirm if my understanding above is correct?
Thanks,
Thai
