PCA9701D,112

I/o Expanders Overview

The PCA9701D,112 is an 18 V tolerant SPI General Purpose Input (GPI) shift register designed to monitor switch status. It features 16 input ports and generates an interrupt when inputs change state. The device operates with a supply voltage range of 2.5 V to 5.5 V and supports SPI speeds up to 5 MHz. It includes an open-drain interrupt output and an interrupt enable pin. With a minimum series resistor of 100 kΩ, it withstands automotive conditions including reverse battery, jump start, and load dump.

I/o Expanders Feature Summary

• 18 V tolerant input ports with integrated ESD protection
• Open-drain interrupt output triggered by input state changes
• Low power consumption with maximum IDD of 2.5 µA
• 4-wire SPI serial interface for data access

I/o Expanders Applications

• Body control modules
• Switch monitoring in industrial equipment
• Cellular telephones
• Emergency lighting systems
• SBC wake pin extension

I/o Expanders Procurement Notes

Verify the component status as the source indicates it may be discontinued or unavailable in certain regions. Confirm package type SO24 matches design requirements. Ensure ordering suffix 112 corresponds to the specific tape and reel configuration if applicable, though datasheet lists 118 for reels. Check RoHS compliance details directly from manufacturer documentation before finalizing procurement.

I/o Expanders Selection Notes

Select this component for applications requiring high-voltage tolerance on input lines without external level shifting. Ensure the system can accommodate the required 100 kΩ series resistors for inputs exceeding 5.5 V to prevent latch-up. Verify that the SPI controller supports the necessary clock polarity and phase settings. Consider the interrupt logic compatibility with the host processor's GPIO capabilities.

I/o Expanders Part Context

The PCA9701D is part of the PCA9701/PCA9702 family of GPI shift registers. It is offered in multiple packages including SO24, TSSOP24, and HWQFN24. The 'D' suffix denotes the SO24 plastic small outline package. It serves as a robust interface solution for monitoring switches in harsh environments, particularly automotive applications where voltage transients are common.

I/o Expanders Replacement Considerations

The PCA9703 and PCA9704 are pin-compatible devices offering interrupt masking features. They provide higher ground offset and hysteresis compared to the PCA9701. When replacing, verify that the interrupt masking functionality aligns with system requirements, as the PCA9701 lacks this feature.