Recommended I2C Pullup Resistors

B0099-05

TAS5086

External

Microcontroller

V

I(SDA)

5V

I

P

I

P

V

I(SCL)

SDA

R

P

R

P

SCL

B0100-05

TAS5086

External

Microcontroller

V

I

5V

I

P

SDA

or

SCL

R

S

(2)

V

S

(1)

R

S

(2)

R

P

TAS5086

www.ti.com ................................................................................................................................................... SLES131C – FEBRUARY 2005 – REVISED JUNE 2008

It is recommended that the I2C pullup resistors RP be 3.3 kΩ (see Figure 4). If a series resistor is in the circuit

(see Figure 5), then the series resistor RS should be less than or equal to 300 Ω.

Figure 4. I2C Pullup Circuit (With No Series Resistor)

(1)

VS = 5 × RS/(RS + RP). When driven low, VS << VIL requirements.

(2)

RS ≤ 300 Ω

Figure 5. I2C Pullup Circuit (With Series Resistor)

Copyright © 2005–2008, Texas Instruments Incorporated

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