https://devzone.nordicsemi.com/f/nordic-q-a/23389/issue-when-try-to-connect-to-a-device-with-nrf-app-androidHi, We use the nrf app (Android smartphone) to establish BLE communication with trackers designed with nrf51822. When trying to connect, sometimes it works, sometimes it doesn&#39;t. When it doesn&#39;t, the current wave on VDD, is a constant 20mA currenten-USTelligent Community 13Tue, 11 Jul 2017 09:33:19 GMThttps://devzone.nordicsemi.com/thread/91943?ContentTypeID=1Tue, 11 Jul 2017 09:33:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b0a53330-0a94-4b15-b6ec-a35eeee7d2cbbjorn-spockeli<p>No problem, we&#39;re happy to help :) Keep me posted with the results.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91942?ContentTypeID=1Tue, 11 Jul 2017 09:32:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a586c0ef-3686-49c9-af52-453eea965086cedric<p>I&#39;m gonna try with a unmodified device and I let you know Anyway thank you very much for your support</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91941?ContentTypeID=1Tue, 11 Jul 2017 09:25:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6726ee1d-4fc9-4a8f-b960-10e15b8927d9bjorn-spockeli<p>80mA peaks are still close to four times the usual peak currents of 20mA. Do you have another device that has not been powered with the 4.7uF caps, i.e. that only has been powered with the 100nF decoupling caps specified in the ref. circuitry? It could be that the nRF51822 has been damaged when using the 4.7uF caps.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91946?ContentTypeID=1Mon, 10 Jul 2017 16:30:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:293e1951-f2ff-4388-920b-f4dd3e5b8058cedric<p>When decoupling caps are 100nF, the peak current is lower but still at 70-80mA And when back to 100nF, we cannot (never) connect the bonded device. I&#39;ve got this specific current wave : 80mA peak and a 30mA DC current that lasts longer every next period, which results in an increasing average consumption when trying to connect, up to the fail to connect after the time out we settled.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91940?ContentTypeID=1Mon, 10 Jul 2017 14:06:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:537ffefd-d146-472b-8bfb-76f85a9e76c1bjorn-spockeli<p>Did you see 100mA peak currents with the 100nF decoupling caps or after these were replaced with 4.7uF? These caps must not be modified, i.e. use the values stated in the PS, otherwise you risk overloading/damaging the internal regulators.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91945?ContentTypeID=1Mon, 10 Jul 2017 12:33:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0be21f5e-04d8-4c6d-93f8-646737866473cedric<p>Hi Bjorn,</p> <p>Thank you very much for your reply. That sounded very high for me too. I&#39;m putting a 0.5 Ohms resistor serial with VDD and I pick the resulting voltage up on a scope. The voltage is low but sufficient to check on it</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91944?ContentTypeID=1Mon, 10 Jul 2017 09:38:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:95b77970-cf26-4136-bde4-550695384db4bjorn-spockeli<p>Hi Cedric, peak currents of 100mA sounds very high, given that the peak current for the Radio @ +4dB is 16mA. How are you performing the current consumption measurements and which measurement hardware are you using?</p><div style="clear:both;"></div>