uPSD33xx power-up problem?

[lwang]

Posted on April 13, 2004 at 12:49

uPSD33xx power-up problem?

[lwang]

Posted on May 17, 2011 at 11:59

I observed a potential problem with uPSD33xx.

a) I am using DK3300 running the STM demo program. b) It is running okay. The LCD shows ''DK3300 Demo V0.9'' etc. c) I unplug the AC adaptor from the AC outlet. d) I wait for a few seconds and plug it back to the AC outlet. e) Sometime it still works. But sometime, it does not. f) When it does not work, even RESET does not help. This is not a problem for DK3300 itself, as I normally do not power it up like this. But is there a power-up problem with uPSD33xx? Do power glitches or slow ramp-up cause it to lockup?

[joseph2399]

Posted on May 17, 2011 at 11:59

Please see the errata sheet that was included with the board. Also note the paragraph towards the end of the first page that describes the replacement board that should be available next month.

[ This message was edited by: uPSD on 13-04-2004 05:36 ]

[lwang]

Posted on May 17, 2011 at 11:59

The errata sheet says Vcc ramp-up must be 2ms or longer.

When I power up by pluging the AC adaptor to the AC outlet, the Vcc ramp-up is 4ms instead of 2ms.