PCA9535PW,118

I/o Expanders Overview

The PCA9535PW,118 is a 24-pin CMOS I/O expander providing 16 bits of General Purpose parallel Input/Output expansion for I2C-bus/SMBus applications. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features 5 V tolerant I/Os, an active LOW interrupt output, and polarity inversion registers. It includes noise filters on SCL/SDA inputs and internal power-on reset functionality. ESD protection exceeds 2000 V HBM. The TSSOP24 package measures 7.9 mm in length and 1.1 mm in height.

I/o Expanders Feature Summary

• Provides 16 configurable GPIO pins with individual input/output direction selection via configuration registers.
• Features an open-drain interrupt output that activates when any configured input state differs from its corresponding register value.
• Includes polarity inversion registers allowing independent inversion of input port data logic levels.

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button matrix reading
• LED control systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix '118' corresponds to the required tape and reel packaging format. Confirm the manufacturer designation matches NXP Semiconductors specifications. Ensure the component meets the required ambient temperature operating range of -40 °C to +85 °C for the intended application environment.

I/o Expanders Selection Notes

Select this component when additional digital I/O ports are required for microcontrollers with limited pins. It serves as a low-power alternative to the PCA9555 by removing internal pull-up resistors, reducing consumption when outputs are held low. Verify compatibility with existing I2C bus addresses using the A0-A2 hardware pins.

I/o Expanders Part Context

This part belongs to the PCA9535 family of 16-bit I2C-bus and SMBus I/O expanders. It is pin-to-pin and address compatible with the PCF8575 but requires software adjustments due to enhanced features. The device is designed to enhance the NXP Semiconductors family of I2C-bus I/O expanders with higher drive capability and smaller packaging options.

I/o Expanders Replacement Considerations

PCA9535PWR (Texas Instruments equivalent)

I/o Expanders FAQ

How does the PCA9535 differ from the PCA9555?

The PCA9535 is identical to the PCA9555 except for the removal of the internal I/O pull-up resistor, which significantly reduces power consumption when the I/Os are held LOW.

What is the default state of the I/O pins at power-on reset?

At power-on reset, all 16 I/O pins default to inputs with high-impedance output drivers.

Can multiple PCA9535 devices share the same I2C bus?

Yes, up to eight devices can share the same I2C-bus/SMBus by varying the fixed I2C-bus address using the three hardware address pins (A0, A1, A2).