lpcware

LPC17xx RTC not reliable within temperature spec

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by probatista on Thu Mar 13 06:27:39 MST 2014
Both the LPC175x and LPC176x errata sheets report an issue with RTC reliability: "The Real Time Clock (RTC) does not work reliably within the temperature specification".

1. Since this issue is said to affect only revisions "Rev A" and "-", I want to buy a newer revision. The Errata sheet explains how to read the revision from the top marking, but I'll buy it on the internet and therefore will not be able to read it. How can I know which revision is the device I will buy without reading its top marking? Does the 551 on this manufacturer part number "LPC1756FBD80,551" says something about it? I'm thinking about buying this: http://br.mouser.com/ProductDetail/NXP/LPC1756FBD80551/?qs=%2fha2pyFaduifPp1Rdf3p9P0nsUa%252bPB82arX1rsDJVCk%3d

2. Are there any more details about this issue? Problems only occur on extreme temperatures (next to the device limits)? If my application will only operate from 10 to 40 degC should I expect any problem? This issue will only cause small delays or might even stop the RTC?

Thanks in advance, any help is appreciated.
Paulo

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