Aug 13, 2007 #1 S sissi Member level 4 Joined Feb 25, 2006 Messages 70 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,288 Activity points 1,716 Hi, i am designing pull-up I/O used in battery system. who can offer me some solutions? thanks
Aug 13, 2007 #2 A A.Anand Srinivasan Advanced Member level 5 Joined Oct 15, 2005 Messages 1,792 Helped 257 Reputation 514 Reaction score 39 Trophy points 1,328 Location India Activity points 10,678 it depends on the resistor or active network you use for pull up.... what r u planning on.... active network or passive network....
it depends on the resistor or active network you use for pull up.... what r u planning on.... active network or passive network....
Aug 14, 2007 #3 S sissi Member level 4 Joined Feb 25, 2006 Messages 70 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,288 Activity points 1,716 I used a pull-up resistor for digital I/O, so when pad is lower level, it will a larger current, and it is unadvisable for lower power chip.
I used a pull-up resistor for digital I/O, so when pad is lower level, it will a larger current, and it is unadvisable for lower power chip.
Aug 14, 2007 #4 A A.Anand Srinivasan Advanced Member level 5 Joined Oct 15, 2005 Messages 1,792 Helped 257 Reputation 514 Reaction score 39 Trophy points 1,328 Location India Activity points 10,678 it generally involves a trade off between power and speed.... if you use larger resistors your power dissipation would be low but your speed of transition would be reduced....
it generally involves a trade off between power and speed.... if you use larger resistors your power dissipation would be low but your speed of transition would be reduced....
Aug 15, 2007 #5 S sissi Member level 4 Joined Feb 25, 2006 Messages 70 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,288 Activity points 1,716 that is to say, if i increase the value of pull-up resistor, lower power also can obtain?
Aug 15, 2007 #6 A A.Anand Srinivasan Advanced Member level 5 Joined Oct 15, 2005 Messages 1,792 Helped 257 Reputation 514 Reaction score 39 Trophy points 1,328 Location India Activity points 10,678 ya.... when the resistance is increased the current which is the main term in power dissipation decreases..... so power loss is reduced....
ya.... when the resistance is increased the current which is the main term in power dissipation decreases..... so power loss is reduced....