PCA9670PW,118

I/o Expanders Overview

The PCA9670PW,118 is an 8-bit remote I/O expander for Fast-mode Plus (Fm+) I2C-bus systems. It operates with a supply voltage range of 2.3 V to 5.5 V and features 5.5 V tolerant I/Os. The device provides eight quasi-bidirectional ports with latched outputs capable of 25 mA sink current each, supporting a total package sink capability of 200 mA. It includes three hardware address pins allowing up to 64 programmable slave addresses on a single bus. Key electrical parameters include a typical static standby current of 2.5 µA, SDA sink capability of 30 mA, and operation within a temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Supports 1 MHz I2C-bus interface for high-speed communication without requiring bus buffers.
• Features latched outputs with 25 mA sink capability suitable for directly driving LEDs.
• Includes active LOW reset input and software reset functionality via General Call address.
• Provides readable device ID containing manufacturer, part identification, and revision information.

I/o Expanders Applications

• LED signs and displays
• Servers and industrial control systems
• Keypads and PLCs
• Medical equipment and instrumentation

I/o Expanders Procurement Notes

Verify the specific ordering suffix '118' corresponds to the TSSOP16 package in reel packing format. Confirm that the component meets RoHS compliance requirements as specified in the official datasheet. Ensure the supplier provides valid traceability documentation for the NXP Semiconductors product line.

I/o Expanders Selection Notes

Select this component when expanding I/O capacity for microcontrollers using the I2C protocol. It serves as a direct upgrade to PCF8574 devices, offering higher bus speeds and drive currents. Consider the TSSOP16 package constraints and the requirement for external pull-up resistors on address pins if not connected directly to logic levels.

I/o Expanders Part Context

This component belongs to the PCA9670 series of remote I/O expanders designed for Fm+ I2C-bus applications. It replaces older parallel I/O port expanders by providing enhanced speed and drive capabilities while maintaining compatibility with standard I2C addressing schemes. The PW suffix indicates the TSSOP16 plastic thin shrink small outline package variant.

I/o Expanders Replacement Considerations

The PCA9670 is a drop-in replacement for the PCF8574, offering improved performance characteristics. Designers upgrading from PCF8574 should verify that the system can support the higher 1 MHz bus speed and 30 mA SDA drive capability.

I/o Expanders FAQ

How are the 64 slave addresses configured?

Addresses are configured using three hardware address pins (AD0, AD1, AD2) which can be connected to VDD, VSS, SCL, or SDA lines to select one of 64 unique slave addresses.

What is the function of the RESET pin?

The RESET pin is an active LOW input that initializes all I/Os to inputs with weak internal pull-ups when held low. It requires a minimum pulse width to trigger a reset.

Can the device be reset via software?

Yes, a software reset can be initiated by sending a General Call address followed by the byte value 06h over the I2C-bus.