PCA9702PW,118

I/o Expanders Overview

The PCA9702PW,118 is an 8-bit General Purpose Input (GPI) shift register manufactured by NXP Semiconductors. It features 18 V tolerant input ports designed to monitor switch status and generate an interrupt upon state changes. The device operates on a 4-wire SPI interface with clock speeds up to 5 MHz and includes an open-drain interrupt output controlled by an INT_EN pin. Supply voltage ranges from 2.5 V to 5.5 V, with a maximum supply current of 2.5 µA. It supports automotive conditions including reverse battery and load dump when used with external series resistors.

I/o Expanders Feature Summary

• 18 V tolerant inputs allow connection to high-voltage sources like automotive batteries using external series resistors.
• Open-drain interrupt output signals state changes on monitored switches without requiring continuous polling.
• Low power consumption with a maximum supply current of 2.5 µA suitable for standby applications.
• Serial cascading capability allows multiple devices to be connected via SDOUT and SDIN pins.

I/o Expanders Applications

• Body control modules
• Switch monitoring
• Industrial equipment
• Cellular telephones
• Emergency lighting

I/o Expanders Procurement Notes

Verify the component datasheet revision and package marking against the specific order number PCA9702PW,118. Confirm that the TSSOP16 package dimensions match the SOT403-1 outline. Ensure the ordering suffix corresponds to the correct packing method and temperature range specifications provided in the manufacturer's documentation.

I/o Expanders Selection Notes

Select this component when monitoring discrete switches in environments with potential voltage spikes or reverse polarity. Ensure the system utilizes a 4-wire SPI interface compatible with the specified logic levels. Verify that the application can accommodate the required external series resistors for inputs exceeding 5.5 V to maintain device integrity under automotive stress conditions.

I/o Expanders Part Context

This part belongs to the PCA9701/PCA9702 family of 18 V tolerant GPI shift registers. The PCA9702 provides 8 input channels, whereas the PCA9701 offers 16 channels in larger packages. Both share identical functional characteristics and are designed for robust switch monitoring in automotive and industrial settings.

I/o Expanders Replacement Considerations

The PCA9703 and PCA9704 are pin-compatible replacements offering interrupt masking features and higher ground offset thresholds. These variants provide additional functionality for selecting which inputs trigger interrupts while maintaining the same physical footprint and basic interface requirements.