PCA9701PW,112

I/o Expanders Overview

The PCA9701PW,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. The component provides high ESD protection exceeding 8 kV HBM and withstands automotive conditions like load dump and reverse battery when used with a series resistor.

I/o Expanders Feature Summary

• 18 V tolerant input ports for direct connection to higher voltage switches
• Open-drain interrupt output that triggers on input state changes
• Low power consumption with maximum IDD of 2.5 µA
• High ESD protection exceeding 8 kV HBM

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 package type matches the design requirements, as this specific part number corresponds to the TSSOP24 variant. Confirm the ordering suffix indicates the correct packing method for the manufacturing line. Ensure the component meets RoHS compliance standards required by the target assembly process. Cross-reference the datasheet revision to confirm all electrical characteristics align with the system specifications.

I/o Expanders Selection Notes

Select this component when 16 GPI channels are required with 18 V tolerance. Consider the TSSOP24 package if board space allows for a 4.4 mm body width. Verify that the host controller supports the 4-wire SPI interface. Ensure the application environment stays within the -40 °C to +125 °C operating temperature range. Check if the interrupt masking feature of the PCA9703 is needed instead.

I/o Expanders Part Context

The PCA9701PW,112 belongs to the PCA9701/PCA9702 family of low-power GPI shift registers. It is pin-compatible with the PCA9702, which offers 8 bits. Newer variants like the PCA9703 and PCA9704 provide interrupt masking capabilities. The PW suffix specifically denotes the TSSOP24 plastic thin shrink small outline package version.

I/o Expanders Replacement Considerations

The PCA9701D is a pin-compatible alternative in the SO24 package. The PCA9701HF is available in the HWQFN24 package. For applications requiring interrupt masking, consider the PCA9703 or PCA9704.