PCAL9539APW,118

I/o Expanders Overview

The PCAL9539APW,118 is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander designed for I2C-bus and SMBus applications. It features an operating power supply voltage range of 1.65 V to 5.5 V and supports Fast-mode communication up to 400 kHz. The device provides 16 I/O pins with interrupt and reset capabilities, packaged in a TSSOP24 format. Key electrical parameters include a typical standby current consumption of 1.5 μA at 5 V VDD and 1.0 μA at 3.3 V VDD. Outputs support a maximum drive capability of 25 mA, suitable for directly driving LEDs. The component operates within a temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Agile I/O functionality including programmable output drive strength, latchable inputs, and configurable pull-up/pull-down resistors
• Open-drain active LOW interrupt output that activates when input states differ from the corresponding Input Port register state
• Active LOW reset input allowing system initialization without de-powering the device
• Internal power-on reset ensuring all channels are configured as high-impedance inputs upon startup

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button detection
• LED driving
• Fan control systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix ',118' corresponds to the TSSOP24 package and reel packing method before procurement. Confirm that the manufacturer NXP Semiconductors is the source of the datasheet documentation. Ensure compatibility with the required I2C bus voltage levels and check for RoHS compliance status if environmental regulations apply to the target assembly process.

I/o Expanders Selection Notes

Select this component when additional GPIOs are needed while minimizing interconnections. It serves as a pin-to-pin replacement for PCA9539 and PCA9539A but offers enhanced Agile I/O features. Consider its wide voltage range for interfacing with next-generation microprocessors where supply levels are dropping. Verify that the open-drain interrupt output requirements match the microcontroller's interrupt input configuration.

I/o Expanders Part Context

The PCAL9539A belongs to the PCAL9539A series of low-voltage I/O expanders. It is part of NXP Semiconductors' portfolio of interface ICs designed to expand I2C-bus capabilities. The device shares architectural similarities with other members like the PCAL9538A but provides 16 bits of expansion compared to 8 bits in the smaller variant. It maintains software backward compatibility with the legacy PCA9539 family.

I/o Expanders Replacement Considerations

The PCAL9539APW is a pin-to-pin replacement for the PCA9539 and PCA9539A. Note that the PCAL9539A powers up with all I/O interrupts masked by default, unlike previous versions which might not have this feature enabled initially.