New Project wp34s micro usb flash cable revisited
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02-05-2015, 12:14 AM
(This post was last modified: 02-05-2015 12:17 AM by BarryMead.)
Post: #11
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RE: New Project wp34s micro usb flash cable revisited
(02-04-2015 11:03 PM)matthiaspaul Wrote: Does someone know if the calculator's RX and TX signals are ESD protected already?The HP-20b/HP-30b schematic shows that the serial inputs are connected with jumpers (JP5, JP6) directly into inputs/outputs on the processor. So the only ESD protection would be the standard I/O input protection diodes on an ARM micro-controller input/output. (Not much) |
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