Unable to find Slave Address using TWI_Scanner

[Kapil Rawat]

Hi 

I'm using nrf52832 custom board with 14.2.0 SDK version and trying to communicate TWI interface with LTC2631 DAC converter. I tested my sensor hardware with Arduino and it's perfectly working and showing 0x22 & 0x73 addresses but when I used the same LTC2631 sensor with the nordic custom board using TWI_Scanner example it's showing the device is not found error.

Pin used in custom board
#define  ANI0_SCL_PIN        2  
#define  ANI1_SDA_PIN        3

the only difference between Arduino and nrf custom board is pin numbers (which I checked properly with my custom board and the connection as well as the numbering is fine).
Maybe the timing of the TWI signal is having some issue but then why I'm not facing the same thing in arduino.

[Jared]

Hi.

Exactly which Arduino model are you using? 

Have you tried scoping the clock and data line? How does it look? Do you see any activity?

regards

Jared 

[Kapil Rawat]

Hi Jared 
I used Arduino mega, please find the scope images for SCL & SDA

SCL:

SDA:

[Jared]

Ok, based on your plots from the scope it seems to be some activity on the pins from the nRF. It's a bit difficult to tell who is sending what, but can you check if the slave responds when the slave address is outputted on the line by the Master?