PCA9535PWJ

I/o Expanders Overview

The PCA9535PWJ is a low-voltage 16-bit I/O expander manufactured by Nexperia, designed for I²C-bus and SMBus applications. It operates within a supply voltage range of 2.3 V to 5.5 V and supports Fast-mode clock frequencies up to 400 kHz. The device provides 16 general-purpose input/output pins housed in a TSSOP-24 package (SOT355-1). Key electrical parameters include an ultra-low standby current consumption of 1 µA maximum, a total power dissipation limit of 200 mW, and a maximum operating temperature of +85 °C with a minimum of -40 °C.

I/o Expanders Feature Summary

• Configurable polarity inversion registers allow logical inversion of input port states without hardware changes.
• Open-drain interrupt output activates when GPIO state changes occur, enabling efficient event-driven communication.
• Hardware-selectable slave addresses via three address pins allow up to eight devices on a single bus.
• Internal power-on reset ensures all I/Os initialize as high-impedance inputs upon startup.

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific suffix 'J' against the manufacturer's official documentation to confirm tape-and-reel packaging specifications. Ensure the ordering part number matches the required temperature range and package variant listed in the datasheet before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when a design requires expanding microcontroller GPIO capabilities over an I²C or SMBus interface. It is suitable for applications needing configurable input/output directions and interrupt signaling. Verify that the system voltage falls within the 2.3 V to 5.5 V operating range and that the available PCB space accommodates the TSSOP-24 package dimensions.

I/o Expanders Part Context

The PCA9535PWJ belongs to the PCA9535 series of low-power I/O expanders from Nexperia. This series is engineered to minimize interconnections in embedded systems by providing parallel port expansion through serial interfaces. The PWJ designation specifically identifies the TSSOP24 plastic thin shrink small outline package version of this device.

I/o Expanders Replacement Considerations

The PCF8575 is pin-to-pin compatible but includes internal I/O pull-up resistors, which increases power consumption compared to the PCA9535. Software modifications may be necessary due to differences in register configurations between these two devices.