http://forums.leaflabs.com/topic.php?id=13099 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:17:32 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=13099#post-28074 Fri, 26 Jul 2013 17:56:32 +0000 ala42 28074@http://forums.leaflabs.com/ <p>The data sheet clearly states that the CPU gets a reset when the volatage is ~2V. You can not change this reset voltage level. You can set up the CPU to cause an interrupt when a specific level is reached.<br /> The fading LED sounds like the __error() function in util.c. Use a debugger or connect USART1 to find out what causes the problem.<br /> You could also disconnect the relays to check if they cause the problem. </p> http://forums.leaflabs.com/topic.php?id=13099#post-28063 Fri, 26 Jul 2013 06:40:03 +0000 stephanschulz 28063@http://forums.leaflabs.com/ <p>thanks for the reply.</p> <p>i found the section you are quoting here:<br /> <a href="http://www.st.com/web/en/resource/technical/document/reference_manual/CD00171190.pdf" rel="nofollow">http://www.st.com/web/en/resource/technical/document/reference_manual/CD00171190.pdf</a></p> <p>unfortunately my knowledge does not go deep enough to be able to covert this in to the right lines of code.<br /> it seems one could set a low and high threshold value and force a reset if the power goes past those thresholds.</p> <p>in my case i am controlling a bunch of relays and at some point the maple mini enters a strange state where the on board led quickly fades in and out.<br /> obviously i have to re-design my circuit about being able to set the brown out would be great too.</p> <p>thx </p> http://forums.leaflabs.com/topic.php?id=13099#post-28057 Thu, 25 Jul 2013 18:52:42 +0000 ala42 28057@http://forums.leaflabs.com/ <p>From the data sheet<br /> <pre><code>2.3.10 Power supply supervisor The device has an integrated power-on reset (POR)/power-down reset (PDR) circuitry. It is always active, and ensures proper operation starting from/down to 2 V. The device remains in reset mode when VDD is below a specified threshold, VPOR/PDR, without the need for an external reset circuit. The device features an embedded programmable voltage detector (PVD) that monitors the VDD/VDDA power supply and compares it to the VPVD threshold. An interrupt can be generated when VDD/VDDA drops below the VPVD threshold and/or when VDD/VDDA is higher than the VPVD threshold. The interrupt service routine can then generate a warning message and/or put the MCU into a safe state. The PVD is enabled by software. Refer to Table 11: Embedded reset and power control block characteristics for the values of VPOR/PDR and VPVD.</code></pre> http://forums.leaflabs.com/topic.php?id=13099#post-28056 Thu, 25 Jul 2013 17:50:46 +0000 stephanschulz 28056@http://forums.leaflabs.com/ <p>is it possible to get the maple mini to reset itself in case the supply voltage drops too much.<br /> i am reading that brown out is the keyword.</p> <p>thanks for any advice.<br /> stephan </p>