TCA9535 datasheet(27/46 Pages) TI1

Part #	TCA9535

Description	Low-Voltage 16-Bit I2C and SMBus Low-Power I/O Expander with Interrupt Output and Configuration Registers

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r

p(max)

b

t

R

0.8473 C

=

´

CC

OL(max)

p(min)

OL

V

R

I

-

=

VCC

3.3 V

5 V

LED

Pn

VCC

LED

Pn

100 k

27

TCA9535

www.ti.com

SCPS201D – AUGUST 2009 – REVISED JULY 2016

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Figure 35. High-Value Resistor in Parallel With LED

Figure 36. Device Supplied by Lower Voltage

9.2.2 Detailed Design Procedure

The pull-up resistors, RP, for the SCL and SDA lines need to be selected appropriately and take into

consideration the total capacitance of all slaves on the I2C bus. The minimum pull-up resistance is a function of

VCC, VOL,(max), and IOL as shown in Equation 5.

(5)

The maximum pull-up resistance is a function of the maximum rise time, tr (300 ns for fast-mode operation, fSCL =

400 kHz) and bus capacitance, Cb as shown in Equation 6.

(6)

The maximum bus capacitance for an I2C bus must not exceed 400 pF for standard-mode or fast-mode

operation. The bus capacitance can be approximated by adding the capacitance of the TCA9538, Ci for SCL or

Cio for SDA, the capacitance of wires/connections/traces, and the capacitance of additional slaves on the bus.

For further details, refer to I2C Pull-up Resistor Calculation application report, SLVA689.

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