https://devzone.nordicsemi.com/f/nordic-q-a/62945/reading-irms-and-vrms-value-from-acs71020-sensor-using-i2c-protocolHi I am reading the Irms and Vrms data from the register 0x20 so i am using nrf_drv_twi_rx(&amp;m_twi, ACS71020_ADDRESS, m_sample, sizeof(m_sample)); where we specify only device address so how can we know that the data we are getting is from same registeren-USTelligent Community 13Wed, 24 Jun 2020 15:09:20 GMThttps://devzone.nordicsemi.com/thread/256754?ContentTypeID=1Wed, 24 Jun 2020 15:09:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:10d0c3a1-3bb4-4279-b1a1-581650a88190haakonsh<p>I assume V_I_RMS is the register address you are trying to read, then my question is what is your current issue? What did you expect to observe and what did you actually observe?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/256645?ContentTypeID=1Wed, 24 Jun 2020 10:11:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:793b88fc-93df-4a0c-849a-5a010494f1fbSaagar<p>No as&nbsp;<span>nrf_drv_twi_rx takes only device address</span></p> <p>As per my understanding first we need to write to the register then we have to read data from that register</p> <p>&nbsp;uint8_t acc = V_I_RMS;</p> <p>err_code = nrf_drv_twi_tx(&amp;m_twi, ACS71020_ADDRESS, &amp;acc, sizeof(acc), false);<br /> APP_ERROR_CHECK(err_code);</p> <p>err_code = nrf_drv_twi_rx(&amp;m_twi, ACS71020_ADDRESS, m_sample, sizeof(m_sample));<br /> APP_ERROR_CHECK(err_code);</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/256640?ContentTypeID=1Wed, 24 Jun 2020 09:56:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7f896c5e-209c-4ea4-ad60-40cb02fd60e9haakonsh<p>Do you not send the register address in your read command?&nbsp;</p><div style="clear:both;"></div>