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Topics - sirivlis

#1
LPC9xx/LPC9xxx / programming P89LPC935
June 01, 2007, 10:25:10 AM
Hi

I use lpc935fa in my project.
To program it via isp (Flash-magic)i use max232
and 2 npn transistors to go from 3.3 to 5 volts for txd and  2 npn transistors to go from 5 to 3.3 volts for rxd.
(i will use max3232 but it will take 15-20 days to get it)
Everything works fine with:
-------
P89LPC935FA
CD3829
TtG0439   A
-------
Yesterday i receive
-------
P89LPC935FA
Pb-Free Package
452004
-------
Flash magic can't communicate with these new chips.
After reset, i measure 0 volts on pins rxd and txd.
Seems like they are in input or open drain mode.

Excuse my bad english.
thanks for any help.