PCAL6408APWJ

I/o Expanders Overview

The PCAL6408APWJ is an 8-bit general-purpose I/O expander manufactured by NXP Semiconductors, designed for remote I/O expansion via the I2C-bus interface. It operates within a supply voltage range of 1.65 V to 5.5 V and supports bidirectional voltage-level translation between the I2C bus and Port P. The device features Agile I/O capabilities, including programmable output drive strength, latchable inputs, and configurable pullup/pulldown resistors. It includes an active LOW reset input, an open-drain interrupt output, and Schmitt trigger action on SCL/SDA inputs. The component is housed in a TSSOP16 package with an operating temperature range from -40 °C to +85 °C.

I/o Expanders Feature Summary

• Bidirectional voltage-level translation capability between I2C bus voltages (1.8 V, 2.5 V, 3.3 V, or 5 V) and Port P voltages.
• Agile I/O features allowing software backward compatibility with PCA6408A, including programmable output drive strength and input latching.
• Integrated interrupt functionality with maskable interrupts and an interrupt status register to identify interrupt sources.
• Built-in noise filters on SCL/SDA inputs and Schmitt trigger action for improved switching noise immunity.

I/o Expanders Applications

• Battery-powered mobile applications requiring additional I/Os while minimizing interconnections.
• Interfacing sensors, push buttons, and keypads to microcontrollers.
• Connecting processors running at one voltage level to I/O devices operating at different voltage levels.

I/o Expanders Procurement Notes

Verify the specific ordering part number PCAL6408APWJ against the manufacturer's official documentation to confirm the TSSOP16 package type and standard marking. Ensure that the required packing method aligns with the specified reel configuration for your production needs. Cross-reference the temperature range specifications to confirm suitability for your intended operational environment.

I/o Expanders Selection Notes

Select this component when a pin-to-pin replacement for the PCA6408A is required with enhanced Agile I/O features. Consider its bidirectional voltage translation capabilities if interfacing between incompatible I/O voltages is necessary. Evaluate the need for programmable pullup/pulldown resistors and interrupt masking to simplify board design and reduce external components.

I/o Expanders Part Context

The PCAL6408A series belongs to NXP's low-voltage translating I/O expander family. It serves as a direct upgrade to the PCA6408A, offering additional configurability through Agile I/O registers while maintaining software backward compatibility. This series is designed to provide flexible GPIO expansion for various microcontroller families using the standard I2C-bus interface.

I/o Expanders Replacement Considerations

The PCAL6408APWJ is a pin-to-pin drop-in replacement for the PCA6408APW. Note that the PCAL6408A powers up with all I/O interrupts masked by default, unlike the PCA6408A, which may require firmware adjustments during system initialization to handle spurious interrupts differently.