Can't get CSR 8635 module to pair - Page 1
Forum section: electronics / projects

author: Stephen37
author_rank: Contributor
timestamp: October 10, 2016, 09:44:45 am
content: 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.htmlI 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 documentationhttp://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 ?

author: Buriedcode
author_rank: Super Contributor
timestamp: October 10, 2016, 03:28:39 pm
content: Electrodragon have quite nice documentation.http://www.electrodragon.com/w/ED8635-BDifferent module, same device, but the application circuits are fine.Heres a better page with application schematics:http://www.electrodragon.com/w/EXBTAgain, different module, but the pin functions are the same for both the CSR8653, and CSR8645.

author: Stephen37
author_rank: Contributor
timestamp: October 10, 2016, 05:51:35 pm
content: Thank you, it's exactly what I needed.

author: alboon
author_rank: Newbie
timestamp: January 11, 2017, 12:30:55 am
content: Hey All,I'm trying to get the same module working I have it wired with the same pins as in your picture but no joy.Is there something I need to do to get the module to power up?I followed this diagramhttp://elecmaroc.com/wp-content/uploads/2016/06/Bluetooth-St%C3%A9r%C3%A9o-Audio-Module-schema-1.jpgAll is connected the same apart from the power_en, since I'm using a 3v battery.I looked at your two links but I can't make heads or tails of it, are pin numbers/layout wrong in the listing/image above?Any help on this would be great! Cheers.

author: Buriedcode
author_rank: Super Contributor
timestamp: January 11, 2017, 05:41:59 pm
content: power_en should be pulled high (technically to the IO voltage, 1.8V, but its fine pulled up to vbat with a 10k).as per this schematic:http://www.electrodragon.com/w/File:Exbt_stable_powerup.png

author: alboon
author_rank: Newbie
timestamp: January 11, 2017, 08:26:18 pm
content: Thanks for the reply/help!I managed to get the LEDs to light up for a moment but then they just go off, no noises from speakers and not found by phone/pc.Maybe i got a dud oneEdit: I needed a switch between 10k and power_en and then running the it was turning on then turn itself off again.

author: Buriedcode
author_rank: Super Contributor
timestamp: January 11, 2017, 08:50:21 pm
content: Well, I don't think you need a switch, just tie power_en to Vbat with a 10k

author: alboon
author_rank: Newbie
timestamp: January 11, 2017, 09:40:36 pm
content: The power_en seems to be acting as a on off button :SSo I'll remove the switch from the vbat line.

author: isicom
author_rank: Newbie
timestamp: June 01, 2017, 07:10:08 pm
content: Hi Volk,I am newbie here.I have the absolut same module like Stephen37. And tie the power_en with 10K R to vbat. vbat to Ardunio's 3.3V and gnd to Arduino's gnd. iPhone can't find the module. Please see the images.Thanks for any help

author: alboon
author_rank: Newbie
timestamp: June 02, 2017, 03:54:17 pm
content: Hey.Could you try using the power_en like a button, apply power for a brief moment then disconnect the power to the power_en line. See if the module stays turned on (lights up/flashes)

author: isicom
author_rank: Newbie
timestamp: June 08, 2017, 06:24:41 pm
content: Hi,I couldn't even tie LED....How should I soldering the LED?Couldn't you make a draw, please.isicom

author: donanfer888
author_rank: Newbie
timestamp: April 01, 2022, 07:24:46 pm
content: estou com problema neste modulo... placa F-3288 chip csr8635.luzes acendem e logo desliga.segurando power_en permanece ligado mas nao conecta.seria alguma programacao da eeprom?