PCAL6534EVJ

I/o Expanders Overview

The PCAL6534EVJ is a 34-bit general purpose I/O expander from NXP Semiconductors, packaged in VFBGA42. It provides remote I/O expansion via a Fast-mode Plus (Fm+) I2C-bus interface operating at speeds up to 1 MHz. The device supports ultra-low-voltage operation on the I2C side ranging from 0.8 V to 3.6 V, while the Port P side accommodates voltages from 1.65 V to 5.5 V. Key features include Agile I/O capabilities such as programmable output drive strength, latchable inputs, and configurable pull-up/pull-down resistors. It includes an open-drain interrupt output, active LOW reset input, and switch debounce hardware.

I/o Expanders Feature Summary

• Bidirectional voltage-level translation between low-voltage microcontrollers and higher-voltage peripherals
• Agile I/O features including programmable drive strength, latchable inputs, and individual interrupt masking
• Hardware switch debounce and bit-by-bit interrupt edge specification for flexible signal handling

I/o Expanders Applications

• Battery-powered mobile applications requiring sensor and keypad interfacing
• Mixed power supply systems needing communication between incompatible I/O voltages
• Industrial building automation and consumer home audio systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix EVJ corresponds to the VFBGA42 package and reel packing method when sourcing. Confirm that the component meets the required temperature range of -40°C to +85°C for your application environment. Ensure compatibility with the host system's I2C bus specifications before integration.

I/o Expanders Selection Notes

Select this component when a high pin-count I/O expansion solution is required alongside voltage translation capabilities. The PCAL6534 is suitable for designs where minimizing interconnections is critical. Consider the Agile I/O features if the application demands customizable output drive strengths or specific interrupt handling behaviors without external logic.

I/o Expanders Part Context

The PCAL6534 belongs to NXP's PCAL series of I/O expanders designed for Fm+ I2C interfaces. It complements other devices like the PCAL6524 and PCAL6416A by offering a higher pin count in a compact VFBGA42 package. This series focuses on simplifying mixed-voltage system designs through integrated level shifting and flexible GPIO configuration options.

I/o Expanders Replacement Considerations

Direct substitutes within the same family include the PCAL6524, which offers 24 bits in a VFBGA36 package. For lower pin counts, the PCAL6416A provides 16 bits. Verify pinout compatibility and register mapping differences when migrating between these variants to ensure software and hardware continuity.