PCAL9538ABSHP

I/o Expanders Overview

The PCAL9538ABSHP is an 8-bit I/O expander in HVQFN16 package. It operates on a supply voltage of 1.65 V to 5.5 V with a maximum clock frequency of 400 kHz. The device provides 8 I/Os, featuring open-drain and push-pull output types with a sink current capability of 25 mA. It includes interrupt and reset functions, operating within a temperature range of -40 °C to +85 °C. Standby current is typically 1.5 µA at 5 V and 1.0 µA at 3.3 V. ESD protection exceeds 2 kV HBM.

I/o Expanders Feature Summary

• Agile I/O capabilities including programmable drive strength, latchable inputs, and configurable pull-up/pull-down resistors
• Interrupt masking and status registers for precise control over input change notifications
• Pin-to-pin replacement for PCA9538 with software backward compatibility
• All I/O interrupts masked by default upon power-up to prevent spurious signals

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push-button input handling
• LED direct driving
• Fan control systems

I/o Expanders Procurement Notes

Verify the ordering suffix HP indicates HVQFN16 packaging in reel format. Confirm the specific revision matches design requirements. Check RoHS compliance documentation. Ensure the manufacturer is NXP Semiconductors. Validate the part number against official distributor catalogs.

I/o Expanders Selection Notes

Select this component when Agile I/O features like input latching or programmable drive strength are required. It serves as a drop-in replacement for PCA9538 but offers enhanced interrupt management. Consider the 1.65 V to 5.5 V voltage range for low-power microcontroller interfacing. Verify package availability if HVQFN16 is preferred over TSSOP16.

I/o Expanders Part Context

The PCAL9538A belongs to NXP's I/O expander family designed for I2C-bus and SMBus applications. It enhances the standard PCA9538 by adding Agile I/O features such as programmable output drive strength and interrupt masking. This series supports minimal interconnection designs while providing flexible GPIO configurations for various system needs.

I/o Expanders Replacement Considerations

PCAL9538ABSHP is a pin-to-pin replacement for PCA9538 and PCA9538A. Software remains backward compatible with these predecessors. However, the PCAL9538A powers up with all I/O interrupts masked, unlike previous versions which may have different default states.