PCA9535PW

I/o Expanders Overview

The PCA9535PW is a 16-bit I/O expander designed for I2C and SMBus interfaces, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features an interrupt output capability and configuration registers for flexible pin direction control. Packaged in a 24-pin TSSOP (TSSOP-24) surface-mount format, it offers low power consumption with a typical operating current of 100 µA. Output drive capabilities include 10 mA sink and 25 mA source currents. The component functions reliably across an extended temperature range from -40°C to +85°C.

I/o Expanders Feature Summary

• Provides 16 bidirectional digital input/output channels via standard I2C and SMBus protocols.
• Includes dedicated interrupt output pin to signal state changes on configured input ports.
• Features individual configuration registers allowing each pin to be set as input or output independently.

I/o Expanders Applications

• Remote I/O expansion in embedded systems requiring additional digital pins.
• Consumer electronics devices utilizing I2C/SMBus communication buses.
• Industrial control modules needing isolated input monitoring and output switching.

I/o Expanders Procurement Notes

Verify the specific manufacturer origin, as NXP Semiconductors also produces the identical part number PCA9535PW. Confirm the datasheet version matches the required specifications. Ensure the TSSOP-24 package dimensions align with the PCB footprint design. Check RoHS compliance status if environmental regulations apply to the final assembly.

I/o Expanders Selection Notes

Select this component when a 16-bit expansion is required over the I2C bus with interrupt support. Compare against the PCA9535RGER variant if a smaller VQFN-24 package is preferred for space-constrained designs. Ensure the system voltage falls within the 2.3 V to 5.5 V operational range. Verify that the 400 kHz maximum clock speed meets the bus timing requirements of the host controller.

I/o Expanders Part Context

This part belongs to the PCA9535 family of low-power I/O expanders. It serves as a bridge between microcontrollers with limited GPIOs and external peripherals. The 'PWR' suffix typically denotes the Texas Instruments manufacturing code for the TSSOP-24 tape-and-reel packaging. It is functionally equivalent to the NXP PCA9535PW but may differ in specific electrical characteristics or documentation.

I/o Expanders Replacement Considerations

PCA9535RGER: Same functionality in VQFN-24 package. PCA9535DBQR: Same functionality in QSOP-24 package. PCA9535DWR: Same functionality in SOIC package. NXP PCA9535PW: Pin-compatible alternative from NXP Semiconductors.