PCA9703PW/Q900,118

I/o Expanders Overview

The PCA9703PW/Q900,118 is a low-power 18 V tolerant SPI General Purpose Input (GPI) shift register designed for switch status monitoring. It features 16 input ports with interrupt masking and an open-drain INT output. The device operates within a supply voltage range of 4.5 V to 5.5 V, consuming a maximum supply current of 2.5 µA. It supports SPI clock speeds up to 5 MHz and includes an INT_EN pin to disable GPI pins and the interrupt output for power saving. The component meets AEC-Q100 standards and functions in temperatures from -40 °C to +125 °C.

I/o Expanders Feature Summary

• 18 V tolerant inputs with integrated ESD protection
• Maskable interrupt generation on state change
• Low power consumption with enable control
• SPI interface supporting daisy-chain connections

I/o Expanders Applications

• Automotive body control modules
• Electronic control units for switch monitoring
• System Basis Chip wake pin extension
• Industrial equipment
• Emergency lighting systems

I/o Expanders Procurement Notes

Verify that the ordering suffix Q900 indicates AEC-Q100 automotive qualification compliance. Confirm the package type matches TSSOP24 specifications. Ensure the supplier provides official datasheets to validate the specific revision level and manufacturing origin before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when 18 V tolerance is required for direct switch monitoring without external level shifting. Use the interrupt masking feature to reduce processor load by ignoring specific inputs. Ensure the system design accommodates the 4.5 V minimum supply voltage and utilizes the INT_EN pin for cyclic biasing applications to minimize battery drain.

I/o Expanders Part Context

This part belongs to the PCA9703 series of 18 V tolerant SPI GPIs. It is functionally similar to the PCA9701 but offers updated packaging and automotive qualification. The PW/Q900 variant specifically denotes the TSSOP24 package with AEC-Q100 compliance, distinguishing it from standard commercial versions.

I/o Expanders Replacement Considerations

The PCA9703PW is a direct replacement for the non-automotive PCA9703PW. For automotive designs requiring the same functionality, verify if the PCA9701D is available, though package differences exist. No other NXP parts offer identical 18 V tolerance with maskable interrupts in this form factor.

I/o Expanders FAQ

How does the device handle overvoltage conditions?

The inputs are 18 V tolerant. When used with a minimum 100 kΩ series resistor, the device can withstand double battery, reverse battery, jump start, and load dump conditions.

What is the function of the INT_EN pin?

The INT_EN pin enables or disables both the GPI pins and the interrupt output. Setting it LOW turns off the inputs and disables the interrupt to minimize power consumption in cyclically supplied applications.

Can multiple PCA9703 devices be connected together?

Yes, multiple devices can be serially connected via SDOUT to SDIN. The SCLK and CS signals must be common, and the open-drain INT outputs can be tied together using a single pull-up resistor.