Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

What's the maximum value of the series resistor(Rs) in I2C bus

Status
Not open for further replies.
H

Haier

Junior Member level 2
Junior Member level 2
Joined
Oct 19, 2012
Messages
20
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Visit site
Activity points
1,414
In my design, I need to increase the Rs value to meet fall time demand. However, when the Rp & Rs were selected OK to meet that, they don't meet the function curve showed in the figure in I2C spec.(in my design, VDD=3V3, Rp=4.7K, Rs=1.2K)

I don't know what the defect of a big Rs is to bus signal.
Would someone please do me a favor?:)
 

In my design, I need to increase the Rs value to meet fall time demand.
Click to expand...
Sounds absurd, because there's only a maximum and no minimum fall time specification for I2C.

Maximum Rs values are simply set by logic level requirements and can be easily calculated.
 
  • Like
Reactions: Haier

    H

    Haier

    Points: 2
    Helpful Answer Positive Rating
Maybe for EMC requirement.
FvM said:
Sounds absurd, because there's only a maximum and no minimum fall time specification for I2C.

Maximum Rs values are simply set by logic level requirements and can be easily calculated.
Click to expand...
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top