We are using the 450-0169 part from Laird (Sterling LWB5) in our design. We understand that the Laird LWB5 module uses Cypress' CYW43353 chip & based on this we wish to seek clarification on the following query.
We are able to notice the difference(refer attached image) in the input-amplitude spec for the LPO_IN signal between the datasheets of LWB5 module & the CYW43353 datasheet. The VDDIO supported by the LWB5 module is 1.8V.
We have been referring to 332-00961-R3.0 schematic from Laird(reference schematic for 450-0169), We could see that the LPO_IN input is fed by ASDK-32.768KHZ-LR oscillator which supports operation in only 3.3V(as per the datasheet).
With that being said, Can you please let us know whether it is fine to drive the LPO_IN pin either in 3.3V I/O or 1.8V I/O? The VDDIO for both cases will be maintained as 1.8V.
We got in touch with Laird, they suggest to use 3.3V.
Kindly let us know at the earliest.
You can use 3.3V