https://devzone.nordicsemi.com/f/nordic-q-a/2700/problem-with-twi-sd-and-nrf51-48-22-evalI am using hw TWI with the s110_nrf51822_6.0 softdevice, nrf51_sdk_v5_2_0 I am using pin 3 scl and pin4 sda of the nrf51[48]22 eval boards. I am able to drive these pins high, I have done the test with both nrf51822 and nrf51422 eval boards. Thereen-USTelligent Community 13Sat, 07 Jun 2014 02:54:51 GMThttps://devzone.nordicsemi.com/thread/10557?ContentTypeID=1Sat, 07 Jun 2014 02:54:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:082447ca-3a54-45ea-b435-181a260f256etim<p>The problem was insufficient current to the hmc5983. The hmc5983 has significant current draw during magnetic self calibration. This was creating sufficient signal noise to cause the twi not to work reliably</p><div style="clear:both;"></div>