lpcware

LPC11C14 - CAN clock from IRC at 125k ?

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by DaveNadler on Wed Apr 27 05:03:02 MST 2011
[FONT=Arial]I was delighted to see that LPC11C14 has IRC (internal clock) better than 1% over a wide temperature range (used at 3.3v), as this is good enough to meet the CAN accuracy requirement. I was much less delighted to find in the user manual section 13.2 "[FONT=Comic Sans MS][I][COLOR=DarkRed]Remark: If C_CAN baudrates above 100 kbit/s are required, the system oscillator must be selected as the clock source for the system clock. For lower baudrates, the IRC may also be used as clock source.[/COLOR][/I][/FONT]"

What gives ? I'm attaching to a CAN system running at 125kbit/sec and planned on not using an external crystal; really prefer to avoid the additional parts...

Thanks in advance for any explanation (especially if you can tell me why its really OK to use the IRC ;-),
Best Regards, Dave[/FONT]

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