NXP Semiconductors PCA9534PW/DG,118

Overview

PCA9534PW/DG,118 from NXP Semiconductors is an 8-bit I²C-bus/SMBus GPIO expander in TSSOP16 package, providing configurable input/output ports with polarity inversion, active-low open-drain interrupt output, and 5 V-tolerant I/Os operating from 2.3 V to 5.5 V supply. It enables expansion of digital control and monitoring functions in space-constrained industrial controllers and sensor interface modules.

For engineers reviewing the PCA9534PW/DG,118 datasheet, PCA9534PW/DG,118 pinout, PCA9534PW/DG,118 application, or PCA9534PW/DG,118 equivalent, key selection criteria include I²C address configurability (A0–A2), low standby current (≤1 µA), interrupt-driven input change detection, and compatibility with 400 kHz Fast-mode I²C timing.

Technical Context

The PCA9534PW/DG,118 implements a register-mapped I²C slave interface with four dedicated 8-bit registers: Input Port (read-only), Output Port (writeable), Polarity Inversion (bit-wise inversion enable), and Configuration (input/output direction per pin). All registers are accessible via standard I²C write/read sequences using command bytes 0x00–0x03.

Its interrupt logic asserts the open-drain INT pin when any configured input changes state relative to its latched value in the Input Port register; assertion clears upon reading that register. Power-on reset initializes all I/Os as inputs and sets default register values, including Configuration = 0xFF (all inputs) and Polarity Inversion = 0x00 (no inversion).

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): plastic thin shrink small outline, 16 leads, body width 4.4 mm, 0.65 mm pitch, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar GPIO expander applications.

Compared with PCA9554PW,118 and TCA9534APW,118, the PCA9534PW/DG,118 delivers the lowest standby current and removes internal pull-ups to minimize leakage-making it ideal for battery-backed systems where every nanoamp counts, while retaining full register compatibility and interrupt functionality.

Availability

PCA9534PW/DG,118 is available at Aetrix Electronics and suitable for industrial automation, sensor interface modules, and embedded control panels requiring stable component supply and long-term production continuity.

Supply support for PCA9534PW/DG,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 focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The PCA9534 belongs to NXP's I²C-bus I/O expander product line, designed specifically to extend microcontroller GPIO resources in resource-constrained embedded systems while maintaining low power, high noise immunity, and seamless integration with existing I²C infrastructure.

FAQ

What is the I²C address range supported by PCA9534PW/DG,118?

The PCA9534PW/DG,118 supports seven fixed I²C slave addresses from 0x20 to 0x27, determined by the logic states of hardware pins A0, A1, and A2. Each combination selects a unique address, enabling up to eight PCA9534PW/DG,118 devices on a single I²C bus without address collision. The base address is 0x20, and A0–A2 act as LSB-to-MSB address bits.

Does PCA9534PW/DG,118 require external pull-up resistors on SCL and SDA lines?

Yes, PCA9534PW/DG,118 requires external pull-up resistors on both SCL and SDA lines to ensure proper I²C bus operation. The device features open-drain outputs on these lines and does not include internal pull-ups. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed requirements, with 4.7 kΩ commonly used for 100–400 kHz operation.

How does the interrupt output (INT) behave on PCA9534PW/DG,118?

The INT pin on PCA9534PW/DG,118 is an active-low open-drain output that asserts when any input pin's state differs from its corresponding bit in the Input Port register. It de-asserts automatically when the Input Port register is read, confirming the source of the interrupt. This behavior enables efficient event-driven polling and avoids missed interrupts in multi-interrupt systems.

Can PCA9534PW/DG,118 drive LEDs directly?

Yes, PCA9534PW/DG,118 can drive LEDs directly when configured as outputs, sinking up to 25 mA per I/O pin (with total device limit of 100 mA). For common-anode LED connections, configure the I/O as active-low outputs. Ensure external current-limiting resistors are used, and verify that VDD ≥ LED forward voltage + I·R to avoid excessive supply current - especially critical in battery-powered applications.

What is the power-on reset behavior of PCA9534PW/DG,118?

Upon power application, PCA9534PW/DG,118 performs an internal power-on reset (POR) that holds the device in reset until VDD reaches VPOR (1.7–2.2 V). All registers initialize to default values: Configuration = 0xFF (all I/Os as inputs), Output Port = 0xFF, Polarity Inversion = 0x00, and Input Port reflects physical pin states. This ensures predictable, glitch-free startup without external reset circuitry.