TWI ISSUE !

RE: TWI ISSUE !

kc06 — Fri, 12 Jan 2018 09:28:18 GMT

Hi Martin, I set the frequency to 400kHz which allows me to get SCL and SDA signals on the bus. I can monitor them on a logic analyser. Now I move on reprogramming simple I2C protocol functions. I still have the option to pull-up the lines to 5V but I don't think it will be necessary. Thanks for your help !

RE: TWI ISSUE !

Martin — Thu, 11 Jan 2018 13:16:08 GMT

before you remove the pull-ups, try setting the frequency to 400 instead of 100 . on some sensor this helped me. In my case I had pull-ups on the main pcb holding the NRF and additional ones on the connected sensor pcb - this was dividing the resitors with each additional board attached. you could try what happens if you connect the ADS to 5V if you have it on the pcb. if it starts working and the IC is 5V tolerant, then your problems are the pull-ups...

RE: TWI ISSUE !

kc06 — Thu, 11 Jan 2018 12:41:18 GMT

Hi Martin, thank you for your reply. Address is connected to ground. It is a custom board. I have pull-ups on SDA and SCL. Should I remove them ? I am not to understand. How did you solve your problem ?

RE: TWI ISSUE !

vikrant8051 — Thu, 11 Jan 2018 11:48:42 GMT

devzone.nordicsemi.com/.../

RE: TWI ISSUE !

Martin — Thu, 11 Jan 2018 11:33:26 GMT

what is your address pin connected to? is this a custom board or the arduino break out. in many cases I had, the problem was due to additional pull-ups on SDA and SCL on breakout boards.