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.
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.