NXP Semiconductors PCA9536DP,118

Overview

PCA9536DP,118 from NXP Semiconductors is a 4-bit I²C-bus/SMBus GPIO expander in TSSOP8 package, providing configurable parallel input/output for embedded control interfaces. It operates from 2.3 V to 5.5 V, features 5 V-tolerant I/Os with 100 kΩ internal pull-ups, and supports up to 400 kHz clock frequency. It is used in ACPI power switches, LED drivers, push-button interfaces, and sensor subsystems.

For engineers reviewing the PCA9536DP,118 datasheet, PCA9536DP,118 pinout, PCA9536DP,118 application, or PCA9536DP,118 equivalent, this device delivers deterministic I/O expansion with polarity inversion, noise-filtered I²C interface, and low-standby-current operation across industrial temperature range (−40 °C to +85 °C).

Technical Context

The PCA9536DP,118 implements a register-mapped I²C slave interface with four dedicated 4-bit registers: Input Port (read-only), Output Port (read/write), Polarity Inversion (read/write), and Configuration (read/write). All registers are accessible via fixed I²C address 0x41 (1000001X), with no auto-increment capability - each access requires explicit command byte retransmission.

Its I/O architecture uses CMOS transmission gates controlled by configuration bits; pins default to high-impedance inputs with internal 100 kΩ pull-ups at power-on reset. The device integrates SCL/SDA input noise filters, internal POR circuitry (VPOR = 1.7–2.2 V), and ESD protection exceeding 2000 V HBM, enabling robust operation in noisy industrial bus environments.

Key Specifications

Pinout & Package

TSSOP8 package (SOT505-1): plastic thin shrink small outline, 8 leads, 3 mm body width, 0.65 mm lead 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 PCA9536DP,118, the PCA9534APW,118 adds interrupt capability and double the I/O count at identical footprint, while the TCA6408APWR extends voltage range down to 1.65 V and improves HBM rating - both require layout review for INT pin routing or address jumper placement.

Availability

PCA9536DP,118 is available at Aetrix Electronics and suitable for industrial control panels, embedded PC power management, and sensor interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PCA9536DP,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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PCA9536DP,118 belongs to NXP's I²C-bus I/O expander product line, designed specifically to simplify GPIO expansion in space-constrained, cost-sensitive embedded systems with minimal external components.

FAQ

What is the I²C address of the PCA9536DP,118 and is it configurable?

The PCA9536DP,118 has a fixed 7-bit I²C slave address of 0x41 (1000001X), where the LSB is the R/W bit. This address is hardwired and not configurable via pins or registers - only one PCA9536DP,118 can reside on a given I²C bus segment without address conflict. The PCA9536DP,118 datasheet confirms this in Section 6.4 "Device address" and Figure 6.

Does the PCA9536DP,118 support hot insertion or live bus connection?

The PCA9536DP,118 does not include dedicated hot-swap protection circuitry, but its 5 V-tolerant I/Os and noise-filtered SCL/SDA inputs allow safe connection to an active I²C bus under certain conditions. However, NXP recommends powering the PCA9536DP,118 before asserting SCL/SDA to avoid bus contention. Full hot-plug compliance requires external isolation or bus buffer circuits beyond the PCA9536DP,118 capabilities.

How does the polarity inversion register affect reading switch inputs on the PCA9536DP,118?

The Polarity Inversion register (Register 2) allows individual bits to invert the logic level read from the Input Port register. For example, if a normally-open pushbutton pulls IO0 low when pressed, setting bit N0 = 1 makes the Input Port register report '1' on press - eliminating need for software negation. This behavior is defined in Section 6.1.4 and Table 7 of the PCA9536DP,118 datasheet.

Can the PCA9536DP,118 drive LEDs directly, and what current limits apply?

Yes - the PCA9536DP,118 can source or sink up to ±25 mA per I/O pin (with total device limit of 100 mA), making it suitable for direct LED driving. At VDD = 3.0 V and VOL = 0.7 V, typical sink current is 19 mA (Table 10). Always verify voltage drop and thermal dissipation; for higher brightness or multiple LEDs, external FETs are recommended. This capability is specified in Section 8 "Limiting values" and Table 10 of the PCA9536DP,118 datasheet.

What happens to the I/O pins during power-on reset of the PCA9536DP,118?

During power-on reset, all four I/O pins (IO0–IO3) are placed in high-impedance input mode with internal 100 kΩ pull-up resistors enabled. The device remains in reset until VDD exceeds VPOR (1.7–2.2 V), ensuring glitch-free startup. No output state is asserted until configuration registers are written post-reset - this behavior is documented in Sections 2 ("Features"), 6.2 ("Power-on reset"), and Figure 1 of the PCA9536DP,118 datasheet.