https://devzone.nordicsemi.com/f/nordic-q-a/3225/ftdi-spi-cable-c232hm-with-nrf51822-ekThe nRF51822-EK, when powered over USB, seems to be working on 3.0V. The C232HM SPI cable is a 3.3V cable. The nRF51 data sheet specifies VIO as VDD+0.3 as absolute maximum. Is it safe to connect this cable to the evaluation kit without level shifteren-USTelligent Community 13Thu, 24 Jul 2014 13:43:29 GMThttps://devzone.nordicsemi.com/thread/11830?ContentTypeID=1Thu, 24 Jul 2014 13:43:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fc935c6e-fa4a-482a-a063-1f8edde7400cwdu<p>Excellent, thank you for sharing your experience</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11829?ContentTypeID=1Wed, 23 Jul 2014 08:59:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eede854b-8c5f-40cc-87cf-207ff4de0ce7cocoa<p>nRF51822 VDD range in normal mode is Min 1.8V , Typ 3.0V, Max 3.6V.</p> <p>I use ftdi chips (FT232R - USB powered, Vout = 3.3V) with EK boards and no issues in more than a year.</p> <p>-c</p><div style="clear:both;"></div>