PCA9502BS,128

Overview

The PCA9502BS,128 is an 8-bit I/O expander featuring a selectable I2C-bus or SPI host interface. It operates at 3.3 V or 2.5 V and supports up to 400 kbit/s on the I2C bus and 15 Mbit/s on SPI. The device provides eight programmable I/O pins and includes software reset functionality independent of hardware signals. It utilizes an HVQFN24 package (SOT616-3) with dimensions of 4 x 4 x 0.85 mm. The component supports 16 hardware-selectable slave addresses via A0 and A1 pins and functions within an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• Selectable communication interface between I2C-bus and SPI modes determined by a dedicated hardware pin.
• Integrated software reset capability allowing internal register initialization without external hardware reset signals.
• Input change interrupt generation with configurable input latching options for state capture.

Applications

• Factory automation and process control systems
• Portable and battery-operated devices
• Cellular data equipment

Procurement Notes

Verify the ordering suffix ',128' corresponds to the specified HVQFN24 SMD reel packaging configuration. Confirm that the selected interface mode matches the system requirements, as the I2C/SPI selection pin must be hardwired correctly during power-up. Ensure pull-up resistor values align with the specific supply voltage used in the design.

Selection Notes

Select this component when a small footprint is required alongside flexible interface options. The dual-interface capability allows designers to optimize PCB routing based on available microcontroller resources. Verify that the operating voltage matches either 2.5 V or 3.3 V rails, as these are the supported operational levels for optimal performance.

Part Context

This part belongs to the PCA9502 series of 8-bit I/O expanders manufactured by NXP Semiconductors. It is designed to provide additional GPIOs through serial interfaces, reducing pin count requirements on the main processor. The BS variant specifically denotes the HVQFN24 package type suitable for space-constrained applications.

Replacement Considerations

No public confirmed substitute part numbers are documented in the provided source material.