I have received an F-3288 board from an ebay seller that scammed me by changing the pictures and description and then sending the wrong bluetooth module.
More info : https://www.aliexpress.com/store/product/CSR8635-Bluetooth-4-0-module-stereo-voice-answer-with-phone-hands-free-function/237108_2032841451.html
I suppose the pins are drawn when looking from the top.
Now I am trying to use the module and I can't get it to pair, I used an AMS1117-3.3 converter to power up the module with VOUT connected to VBAT and GND connected to GND below VBAT. I also soldered a ~3cm wire to RF.
My phone didn't find the module just by powering it up.
Then in my anger I started poking around with my multimeter on RST, VBAT, GND, the bottom pins and POWER_EN, 1V8 set to DC amps (at least to see some smoke coming out) and I tried random combinations while still searching on my phone. With some random combination I managed to get the module detected by the phone and appeared as ThinkLoop headphones (so it's 100% my board).
However I have no idea which combination made my board to get detected (I could actually reproduced it two times and managed to play music, but it seems completely random) , I also soldered a 1K resistor on POWER_EN and started poking on GND, VBAT but nothing happens.
I suppose I might need to connect VBAT_SENSE to VBAT and RST to VBAT. Also the POWER_EN is a switch in the following documentation http://server4.eca.ir/eshop/ECA_Modules/index.php?d=SPK-8635-B%5B3011016004%5D&f=20140514-151241_btm8635.pdf,
so I suppose I need to also turn on the board with a switch pulled high.
I don't have a scope or logic analyzer to check the pins so I am here to ask whether anyone used a similar module and how he managed to make it work ?