https://devzone.nordicsemi.com/f/nordic-q-a/18255/timeout-in-i2c-api-in-nrf51-dkhello! in i2c bus , if i2c slave didn&#39;t give response then what is timeout period ??en-USTelligent Community 13Thu, 08 Dec 2016 14:11:08 GMThttps://devzone.nordicsemi.com/thread/70503?ContentTypeID=1Thu, 08 Dec 2016 14:11:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e7827d5f-11b6-4084-9c6e-70cdc8e7f071Ole Bauck<p>Hi,</p> <p>If the slave does not respond, the master will read a NACK on the address or the data frame (ANACK or DNACK). Then you will get an event with type <code>NRF_DRV_TWI_EVT_ADDRESS_NACK</code> or <code>NRF_DRV_TWI_EVT_DATA_NACK</code> if you are using event handler. If you are not using event handler (using blocking calls), then the rx or tx function will return <code>NRF_ERROR_DRV_TWI_ERR_ANACK</code> or <code>NRF_ERROR_DRV_TWI_ERR_DNACK</code>.</p> <p>Also see <a href="https://learn.sparkfun.com/tutorials/i2c#protocol">this text</a> about ACK/NACK.</p> <p>Ole</p><div style="clear:both;"></div>