TWI Scanner Shows Unknown Address

[lufeitan]

When I run the TWI scanner example, an unknown address shows up in tandem with my TWI device address.

 

I am connecting a MAX30101 EV kit daughter board to the nRF52840-DK. Its address is 0x57, which shows up. But the address 0x19 also shows up, and I don't know what is this address. If I don't supply power to the power board and just leave the TWI pins 26 and 27 connected to the daughter board, TWI scanner still finds address 0x19.

I am not sure if this is a glitch, error on my part, or something else. Can someone please help me?

[Øyvind]

Hello,

I am not able to reproduce this error on my nRF52840-DK. What happens if you disconnect pins 26 an 27, and not have anything connected to the DK?

Best regards,

Oeyvind

[lufeitan]

The debug terminal shows "No device was found."

[Øyvind]

Not sure what caused the "ghost" address, but it seems to come from the other board.