2006-11-17 02:21 AM
IO pin output current rating on STR730
2006-11-04 09:53 AM
I see a conflict in the STR73F pdf document 11651. Table 3, in Output Capability shows almost every pin having a rating of 2 mA. In section 3 ''Electrical parameters'', Table 5, indicates Max IO current rating (for both source and sink) having 10 mA. What is the case?
Thanks Barry2006-11-15 10:02 PM
Hello,
Table3 & table 5 values are different becasue test condition are different: The output capability in the table 3 is almost 2mA with exception JTDO pin = 4mA & P6.0= 8mA. However, the table 5, it lists the absolute maximum rating under the maximum stress condition which could damage the device. Note in this table, the I/O type is not specified. I suggest you to have a look on table 22 , the� output driving current� for the three different I/O types; standard, Med current (JTDO) and High current (P6.0). Also Fig13..Fig17, graphs shows the results of the output driving current for the I/O types in different temperature. Hope this confusion is clear. Regards.2006-11-16 07:35 PM
I came to that conclusion after reading the document over again. I was originally planning on driving 5 ma photo-optical devices directly from the I/O pins. I now changed that by using external shift registers with output latches which will drive the devices.
Question: What is the value of the input weak pull-ups? 100K? Thanks, Barry2006-11-17 02:21 AM
For the Input pins; pu/pd are with internal 100kΩ weak pull-up or pull down.
For the Weak pu/pd equivalent resistor, please refer to table21. Regards.