https://devzone.nordicsemi.com/f/nordic-q-a/21738/analog-input-influence-of-the-vcc-changingHi I read somewhere that when using internel ref for analog measurements the Vin changing does not influences the analog reading. Is that true? Please, consider the circuit on this link: devzone.nordicsemi.com/.../ Suppose we start with a 3en-USTelligent Community 13Sun, 30 Apr 2017 13:43:04 GMThttps://devzone.nordicsemi.com/thread/85384?ContentTypeID=1Sun, 30 Apr 2017 13:43:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6e5e67ab-14bb-41d9-a617-6b0f57705667Alex Co<p>By the way i am not planning to read analog value while driving BLE. Should i use even though a large cap in the board vin? Any schematic for that. ?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/85383?ContentTypeID=1Sun, 30 Apr 2017 12:27:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:de2c6b37-2bf7-42dc-88f7-36b83d49fb04Turbo J<blockquote> <p>Can we trust in the analog conversion during all time of battery draining (until 1.8v)?</p> </blockquote> <p>Yes, according to the datasheet...</p> <p>But you also have to check the circuit that <em>produces</em> the analog voltage being measured. That&#39;s why I strongly recommend checking the behaviour with a labratory power supply and a resistor simulating the drained coin cell (which would have a quite large internal resistance at this point).</p> <p>The BTLE TX/RX drains the battery - which then recovers in the low current gaps between transmissions, so the voltage will <em>not</em> be constant unless you use <strong>large</strong> reservoir caps.</p><div style="clear:both;"></div>