I2C总线上拉电阻值计算
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SLVA689–February 2015
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Copyright © 2015, Texas Instruments Incorporated
I2C Bus Pullup Resistor Calculation
Application Report
SLVA689–February 2015
I2C Bus Pullup Resistor Calculation
Rajan Arora
ABSTRACT
Pullup resistor calculation for I2C interface is a commonly asked question. In this application note we
show how to use simple equations for this calculation.
Contents
1 Introduction ................................................................................................................... 1
2 Pullup Resistor Calculation ................................................................................................. 2
3 Speed Versus Power Trade-off ............................................................................................ 4
4 Example....................................................................................................................... 4
List of Figures
1 Application Example Showing I2C Communication Between the Different IC's on a System and With
Pullup Resistors on I2C Bus ............................................................................................... 2
2 Minimum Pullup Resistance [R
P
(min)] vs Pullup Reference Voltage (V
CC
) .......................................... 3
3 Maximum Pullup Resistance [R
P
(max)] vs Bus Capacitance (C
b
) .................................................... 3
List of Tables
1 Parametrics from I2C specifications....................................................................................... 3
Trademarks
1 Introduction
I2C communication standard is the mostly widely used inter-chip communication standard in today’s
electronic systems. It is an open-drain/open-collector communication standard which implies integrated
circuits (IC’s) with different voltage supply rails can be connected for communication. Pullup resistors need
to be connected from the I2C lines to the supply to enable communication as shown in Figure 1. The
pullup resistors pull the line high when it is not driven low by the open-drain interface. The value of the
pullup resistor is an important design consideration for I2C systems as an incorrect value can lead to
signal loss. In this article we show the simple equations for the pullup resistor calculation which the system
designer can use to do quick calculations for their design.
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