PCA9555PW

I/o Expanders Overview

The PCA9555PW is a remote 16-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It provides general-purpose digital input and output expansion via the I2C interface, supporting standard (100 kHz) and fast mode (400 kHz) clock frequencies. The device operates within a supply voltage range of 2.3 V to 5.5 V and features an interrupt output pin for efficient event handling. It is housed in a 24-pin TSSOP package with surface-mount installation. Each I/O channel includes internal pull-up resistors, configurable via configuration registers. The component supports ESD protection up to 2 kV and functions reliably across an operating temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Provides 16-bit I/O expansion through I2C and SMBus serial interfaces
• Includes dedicated interrupt output pin for asynchronous status signaling
• Features individually configurable configuration registers for input/output direction control
• Integrates internal pull-up resistors on all I/O channels

I/o Expanders Applications

• Portable systems requiring additional GPIO pins
• Industrial control panels needing remote I/O expansion
• Consumer electronics with limited microcontroller pins
• Embedded systems utilizing I2C or SMBus communication protocols

I/o Expanders Procurement Notes

Verify the manufacturer marking matches Texas Instruments, as NXP also produces compatible parts under the same part number prefix. Confirm the suffix 'PW' indicates the TSSOP-24 package variant. Check RoHS compliance documentation if environmental standards are required. Ensure the specific revision level meets your design requirements. Cross-reference datasheets between TI and NXP if substituting sources.

I/o Expanders Selection Notes

Select this component when 16 bidirectional I/O lines are needed over an I2C bus. It is suitable for systems operating between 2.3 V and 5.5 V. Consider the interrupt capability if real-time response to input changes is necessary. Verify that the TSSOP-24 footprint fits the PCB layout constraints. Compare against other PCA95xx series devices if fewer bits or different interfaces are sufficient.

I/o Expanders Part Context

The PCA9555 belongs to the PCA955x family of I/O expanders from Texas Instruments. It shares functional similarities with the PCA9554 and PCA9557 but offers 16 bits compared to their 8-bit counterparts. The 'PWR' suffix typically denotes the tape-and-reel packaging version, while 'PW' refers to the cut-tape or tube variant of the same TSSOP-24 package. This family is widely used in embedded applications for system flexibility.

I/o Expanders Replacement Considerations

PCA9555PWR: Same function, reel packaging. PCA9555PWG4: Lead-free version of the PW package. PCA9555PWE4: Obsolete version of the PW package. NXP PCA9555PW,112: Pin-compatible alternative from NXP with identical electrical specifications.