Wi-Fi Combo Forum Discussions

Hi,

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.

Sterling-LWB5 Dual-Band 802.11ac Wi-Fi + Bluetooth v4.1 Combo Module

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.

Thanks,

We followed this example from WICED-MFG202-R.pdf to generate a carrier wave using the mfg test app running on a BCM9433642WCD4 module:

wl --serial 99 down

wl --serial 99 country ALL

wl --serial 99 band b

wl --serial 99 mpc 0

wl --serial 99 up

wl --serial 99 out

wl --serial 99 fqacurcy 6

We see the spike with the spectrum analyzer. Then we attempted to change the power level via: txpwr1 -d 15 and also tried using milliwatts units. We cannot get the power level to change. The test app claims the power level has changed as reflected by the return value of the txpwr command, but the output on the spectrum analyzer does not change.

We also performed the modulated test from the same document:

wl --serial 99 down

wl --serial 99 country ALL

wl --serial 99 band b

wl --serial 99 chanspec -c 1 -b 2 -w 20 -s 0

wl --serial 99 mpc 0

wl --serial 99 ampdu 1

wl --serial 99 bi 65000

wl --serial 99 frameburst 1

wl --serial 99 rateset 11b

wl --serial 99 up

wl --serial 99 txant 0

wl --serial 99 antdiv 0

wl --serial 99 nrate -r 11

wl --serial 99 phy_watchdog 0

wl --serial 99 disassoc

wl --serial 99 txpwr1 -1

sleep 3

wl --serial 99 pkteng_start 00:90:4c:aa:bb:cc tx 40 1000 0

We see that the spectrum has broadened due to the modulation but the txpwr1 again has no effect in changing the actual power level.

(1) What is the correct way to change the power level for carrier wave and modulated transmit tests using the mfg test app?

(2) Is there a programmatic way to do this in our app via the WICED API?