I got an EE to bring over an OScope, and we may have found out some more info.
First, we have verified that it is sending programming pulses.
Unfortunately, these pulses are only 8.5V for 480microseconds. We've
viewed the +12 supply on VPP, and verifed it is 12V. From my
understanding, VPP
Good information.
12V x 480 usec
Sounds like a problem with the power supply -- can't keep the voltage high
enough with a load.
I take it there is only one device one the line? Resistance? Diode losses?
Paul Alfille
On 10/1/07, Jim Kusznir [EMAIL PROTECTED] wrote:
I got an EE to bring over
This is an obvious thing, but have you tried putting a capacitor right on
the power supply leads to the chip? 0.1uF bypassing cap should do the
trick I think?
njh
On Mon, 1 Oct 2007, Jim Kusznir wrote:
I got an EE to bring over an OScope, and we may have found out some more info.
First,
Thanks for the help!
We actually found that the DS9490R includes a zener diode (in package
DS9503P) that limited the output. We removed and properly bypassed
it, and now get programming pulses to 10.5V, which appears sufficient
to burn the prom. We are sucessfully burning the eprom in the
Hello!
I believe I am missing something here. Jim you, and your staff (I presume
you have one because of the EE and his scope.) did all of that with a
DS9490R and successful.
What about using the passive version of the DS9097? (And of course I do not
recall the full number for this gizmo, just
