PCA9502BS,151

Overview

The PCA9502BS,151 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 GPIO 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 protocol between I²C-bus and SPI modes determined by a dedicated hardware pin.
• Supports software reset capability allowing internal register initialization without hardware signal intervention.
• Provides interrupt generation triggered by changes in state of configured input pins.

Applications

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

Procurement Notes

Verify the ordering suffix matches the required packaging configuration. Confirm the specific variant aligns with the intended voltage supply and interface selection requirements for the target design.

Selection Notes

Select this component when space-constrained designs require an 8-bit expansion solution. Ensure the host controller supports either I²C Fast-mode or SPI Mode 0. Verify that the available address pins allow for the necessary unique addressing within the system topology.

Part Context

This part belongs to the NXP PCA9502 series of I/O expanders. It shares core architectural features with other members of the family but is distinguished by its specific HVQFN24 package and dual-interface support capabilities.

Replacement Considerations

Direct substitutes include other NXP PCA95xx series devices offering similar I/O counts and interface options. Verify pin compatibility and register mapping before implementation.

FAQ

How is the communication interface selected?

The interface is selected via the I2C/SPI pin. A logic HIGH selects the I²C-bus interface, while a logic LOW selects the SPI interface.

What is the function of the IRQ pin?

The IRQ pin is an open-drain output that signals an interrupt condition. It activates when enabled inputs change state, requiring an external pull-up resistor.

Can the device be reset via software?

Yes, writing to the SReset bit in the IOControl register performs a software reset, clearing internal registers independently of the hardware reset signal.