Maurice Reid heeft geschreven in bericht <37450FD6.5BA0@tesco.net> RE: the datasheet specs for the 8052 pull-ups. I'm trying to drive a ULN2003 darlingron array using these ports but haven't worked out if it is possible. The port drivers are specified in terms of Iil at 0v (about -50uA). Other parts talk of the pull-up being equivalent to a 10K resistor. But the figures don't seem to add up
Maurice, If the voltage on the pin is below threshold (as with the darlingtons) a weak pullup is present. If above threshold the internal resistance is 10x lower. Use real pullups on the outside. Arie de Muynck
.8051 I/O usually outputs logic high during reset which can be a pain, as well as having weak pull ups all the time, and this can mean more external hardware considerations.
Interested:
Questions:
| file: /Techref/8051/iopins.htm, 1KB, , updated: 2012/10/16 08:51, local time: 2024/12/22 13:46,
3.142.199.54:LOG IN
|
| ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions? <A HREF="http://sxlist.com/techref/8051/iopins.htm"> 8051 CPU IO Pins</A> |
| Did you find what you needed? |
Welcome to sxlist.com!sales, advertizing, & kind contributors just like you! Please don't rip/copy (here's why Copies of the site on CD are available at minimal cost. |
Welcome to sxlist.com! |
.