PCA9701PW,118

I/o Expanders Overview

The PCA9701PW,118 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 clock speeds up to 5 MHz. It includes an open-drain interrupt output and an interrupt enable pin. The component is housed in a TSSOP24 package and functions within a temperature range of -40 °C to +125 °C.

I/o Expanders Feature Summary

• 18 V tolerant input ports allow connection to automotive battery systems using external series resistors.
• Generates an active LOW interrupt signal upon detection of input port status changes.
• Supports serial cascading of multiple devices for expanded monitoring capabilities.

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix

I/o Expanders Selection Notes

Select this component for applications requiring high-voltage tolerance on input lines without level shifting. Ensure the design includes appropriate series resistors for voltages exceeding 5.5 V to prevent latch-up. Consider the TSSOP24 package constraints and thermal requirements during PCB layout.

I/o Expanders Part Context

This part belongs to the PCA9701/PCA9702 family of GPI expanders. The PCA9701 variant provides 16 bits, while the PCA9702 offers 8 bits. Both share similar electrical characteristics but differ in pin count and package options, such as SO24 or HWQFN24 for the 16-bit version.

I/o Expanders Replacement Considerations

The PCA9703 and PCA9704 are pin-compatible replacements that add interrupt masking features. Verify if the masking capability is required for the specific application before substituting.