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WL1805MOD: What are the characteristics of GPIO11 (Audio SYNC) pin?

Part Number: WL1805MOD

Hello,

we want to use WLAN synchronization due the help of GPIO11. However its unclear what are the proper characteristics of this pin for the connection.

I didn't find anywhere in the specification what is the pulldown resistor. We connected resistor divider from 3.3V level to 1.8V kevel as it is described in https://www.ti.com/lit/an/swra448a/swra448a.pdf?ts=1614021712481 for WLAN enable line. It works fine for WLAN_ENABLE as there is clearly specified 200kOhm pulldown resistor. However for GPIO11 we see after resistor division 1.2V on the output. This is apparently not sufficient to reach high level. It seems that there is a pulldown about 10kOhm on this pin. We also measured second board and we got slighlty different values. So it ranges somehwere around 9 - 11kOhm.

It would be nice to know more details about this pin.

Thanks.