NXP Semiconductors PCA9675DB,118

Overview

PCA9675DB,118 from NXP Semiconductors is a 16-bit remote I/O expander for Fast-mode Plus (Fm+) I²C-bus systems, providing quasi-bidirectional port expansion with 1 MHz bus speed, 25 mA per I/O sink capability, and active-low open-drain interrupt output. It operates from 2.3 V to 5.5 V, supports 64 programmable slave addresses, and is used in LED signage, industrial PLCs, and server management subsystems.

For engineers reviewing the PCA9675DB,118 datasheet, PCA9675DB,118 pinout, PCA9675DB,118 application, or PCA9675DB,118 equivalent, this device delivers high-current I/O expansion with Fm+ timing compliance, integrated POR reset, readable device ID, and interrupt-driven host notification-critical for scalable, low-latency embedded I/O architectures.

Technical Context

The PCA9675DB,118 implements a dual-byte I²C register map where Port 0 (P00–P07) and Port 1 (P10–P17) are latched independently; data writes occur in even-byte sequences with first byte mapping to P0 and second to P1. Its quasi-bidirectional I/O architecture uses internal weak pull-ups (I_trt(pu) = 100 µA) and strong sink drivers (25 mA per pin, 400 mA total package), enabling direct LED driving without external transistors.

Interrupt generation is edge-triggered on any I/O state change and cleared automatically upon read/write access to the triggering port or via software reset using General Call address 00h + data byte 06h. Address selection uses three hardware pins (AD0–AD2), supporting up to 64 unique slave addresses (20h–BEh), excluding reserved ranges (00h, F0h–FFh).

Key Specifications

Pinout & Package

PCA9675DB,118 is supplied in the DHVQFN24 (SOT815-1) package: 3.5 mm × 5.5 mm × 0.85 mm body, 24-terminal no-lead quad flat package with exposed thermal pad connected to VSS. Pin 1 index located at top-left corner; VSS must be soldered to PCB ground plane for electrical stability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar remote I/O expander applications.

Compared with TCA9555RTWR and PCA9539PW,118, the PCA9675DB,118 provides 2.5× higher I²C bandwidth, 2.5× greater per-pin drive strength, and 4× more address options - making it uniquely suited for high-density, high-performance I/O expansion in industrial and lighting systems.

Availability

PCA9675DB,118 is available at Aetrix Electronics and suitable for LED signage, industrial PLCs, and server management systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for PCA9675DB,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in I²C ecosystem components.

The PCA9675DB,118 belongs to NXP's Fast-mode Plus I/O expander product line, engineered specifically for high-speed, high-current remote GPIO expansion in systems demanding deterministic interrupt response and scalable bus topology.

FAQ

What is the maximum I²C bus speed supported by the PCA9675DB,118?

The PCA9675DB,118 supports Fast-mode Plus (Fm+) I²C operation up to 1 MHz - a 2.5× improvement over standard Fast-mode (400 kHz). This enables faster configuration updates and real-time PWM dimming control in LED applications. The PCA9675DB,118 maintains full compatibility with Standard-mode (100 kHz) and Fast-mode (400 kHz) hosts while delivering enhanced throughput in Fm+-capable systems.

How does the interrupt (INT) pin function on the PCA9675DB,118?

The INT pin on the PCA9675DB,118 is an active-low open-drain output that asserts whenever any of the 16 I/O pins changes state - either rising or falling edge. It remains asserted until the host reads or writes the affected port register, or performs a software reset. The PCA9675DB,118 requires an external pull-up resistor on INT; no internal pull-up is provided.

Can the PCA9675DB,118 drive LEDs directly without external components?

Yes - the PCA9675DB,118 can drive standard LEDs directly due to its 25 mA sink capability per I/O pin and 400 mA total package sink current. Each of the 16 quasi-bidirectional ports defaults to HIGH at power-up, allowing safe LED anode connection to VDD and cathode to the port. The PCA9675DB,118 eliminates the need for discrete transistors or driver ICs in most indicator and signage applications.

What are the power supply requirements for the PCA9675DB,118?

The PCA9675DB,118 operates from a single supply of 2.3 V to 5.5 V on VDD, with all I/O pins rated for 5.5 V tolerance - enabling interoperability with both 3.3 V and 5 V microcontrollers. VSS must be connected to system ground, and the exposed thermal pad (pin 12 in DHVQFN24) must be soldered to a VSS copper area for reliable operation and thermal dissipation.

How many unique I²C addresses does the PCA9675DB,118 support?

The PCA9675DB,118 supports 64 unique I²C slave addresses selected via three hardware address pins (AD0, AD1, AD2). These pins accept static logic levels (VDD or VSS) or dynamic control, enabling dense I²C networks - for example, up to 64 PCA9675DB,118 devices on a single bus without address conflict. Reserved addresses (e.g., 00h, F0h–FFh) are excluded from use.