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2004-01-09 by Bill Knight
I've looked for this in the data sheets and seem to remeber it being asked before but never saw an answer. Is there a power supply sequencing requirement for the 1.8 & 3.3 volt supplies? Thanks in advance. -Bill Knight R O SoftWare
2004-01-09 by Leon Heller
----- Original Message -----
From: "Bill Knight" <BillK@...> To: <lpc2100@yahoogroups.com> Sent: Friday, January 09, 2004 12:58 PM Subject: [lpc2100] Tech Question: Power Supply Sequencing > I've looked for this in the data sheets and seem to remeber it being > asked before but never saw an answer. Is there a power supply sequencing > requirement for the 1.8 & 3.3 volt supplies? > > Thanks in advance. > -Bill Knight > R O SoftWare Someone provided this answer to the same question on the Philips MCU Forum: "The only thing you have to take care is to keep RST low until power supply reaches level specified by the data sheet, X1 signal is present and stable, and requested 10 ms expire. 10 ms window is chosen based on measurements when even in the worst case, LPC2106/05/04\ufffds oscillator using external crystal would start to operate properly (measured from the moment when specified power supply is applied, till stable signal on X1 is detected)." He's referring to both supplies, presumably. Leon -- Leon Heller, G1HSM Email: aqzf13@... My low-cost Philips LPC210x ARM development system: http://www.geocities.com/leon_heller/lpc2104.html