NXP Semiconductors PCA9553D/02,118

Overview

The PCA9553D/02,118 from NXP Semiconductors is a 4-bit I²C-bus LED blinker with two fully programmable internal blink rates (0.172–44 Hz), 4 open-drain LED drivers (25 mA per output, 100 mA package max), and GPIO capability for unused pins. It operates from 2.3 V to 5.5 V and integrates an internal oscillator-eliminating external timing components-enabling autonomous LED blinking in embedded control panels and status indicator systems.

For engineers reviewing the PCA9553D/02,118 datasheet, PCA9553D/02,118 pinout, PCA9553D/02,118 application, or PCA9553D/02,118 equivalent, key selection criteria include its fixed I²C address (0xC6), dual PWM blink rate configuration, open-drain sink capability, thermal-enhanced SO8 package, and compatibility with SMBus-level logic.

Technical Context

The PCA9553D/02,118 implements a dedicated I²C slave interface with fixed 7-bit address 0xC6 (R/W bit = 0), noise-filtered SCL/SDA inputs, and Power-On Reset that initializes all registers to default states (LEDs OFF). Its internal oscillator drives two independent PWM generators-PSC0/PWM0 and PSC1/PWM1-with period calculation (T = (PSCx + 1)/44) and duty cycle (DC = (256 − PWMx)/256).

Each of the four LEDn outputs functions as an open-drain driver configurable via the LS0 register: static HIGH (off), static LOW (on), or blink at either BLINK0 or BLINK1 rate. Unused LED pins serve as GPIOs with high-impedance input mode and pull-up–dependent output mode, supporting mixed signal control without bus master intervention after initial setup.

Key Specifications

Pinout & Package

PCA9553D/02,118 is supplied in an SO8 package (SOT96-1), 3.9 mm body width, with gull-wing leads and exposed pad not present. Pin 1 (LED0) is index-marked; pin 4 (VSS) and pin 8 (VDD) provide power return and supply respectively.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED blinker applications.

Compared with TLC59108IPWR and PCA9555D,118, the PCA9553D/02,118 uniquely delivers autonomous dual-rate LED blinking with zero MCU runtime overhead, making it optimal for resource-constrained or safety-critical status indication where deterministic timing and bus efficiency are essential.

Availability

PCA9553D/02,118 is available at Aetrix Electronics and suitable for industrial control panels, consumer appliance UIs, network equipment indicators, and medical device status modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for PCA9553D/02,118 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 PCA9553 product line was designed specifically for autonomous LED status indication in space- and resource-constrained embedded systems-reducing I²C bus load and offloading timing-critical blink functions from host processors.

FAQ

What is the I²C address of the PCA9553D/02,118 and how does it differ from other PCA9553 variants?

The PCA9553D/02,118 uses a fixed 7-bit I²C slave address of 0xC6 (1100011b), where the LSB distinguishes it from the PCA9553/01 variant (0xC4). This allows both versions to operate simultaneously on the same I²C bus without address conflict, enabling flexible design reuse across product families while maintaining separate blink rate configurations per device.

How do the two programmable blink rates (BLINK0 and BLINK1) function in the PCA9553D/02,118?

The PCA9553D/02,118 implements two independent blink engines: BLINK0 (controlled by PSC0 and PWM0 registers) and BLINK1 (controlled by PSC1 and PWM1 registers). Each defines a unique period (T = (PSCx + 1)/44) and duty cycle (DC = (256 − PWMx)/256), allowing any LED output to be assigned to either rate via the LS0 register-enabling differentiated visual signaling such as slow fault indication and fast activity pulses.

Can unused LED pins on the PCA9553D/02,118 be used as general-purpose I/Os, and how?

Yes-unused LEDn pins on the PCA9553D/02,118 can serve as GPIOs. As inputs: configure the pin to high-impedance (01 in LS0) and read its state via the INPUT register. As outputs: connect an external pull-up resistor and drive LOW via LS0 (00) or HIGH via high-Z (01); PWM-controlled output is also possible when assigned to BLINK0/BLINK1. No additional hardware is required beyond the pull-up.

What is the maximum sink current capability per output and total for the PCA9553D/02,118?

The PCA9553D/02,118 supports up to 25 mA sink current per LEDn output (pins 1–3 and 5), with a total package limit of 100 mA. This allows direct driving of standard 2–20 mA LEDs without external transistors. Exceeding 25 mA per pin or 100 mA total risks thermal shutdown or parametric shift; design must ensure compliance with both per-pin and aggregate limits under worst-case duty cycles.

Does the PCA9553D/02,118 require external components for its internal oscillator to function?

No-the PCA9553D/02,118 integrates a fully self-contained oscillator requiring no external capacitors, resistors, or crystals. This oscillator drives both BLINK0 and BLINK1 PWM generators, enabling immediate autonomous LED blinking after power-up and I²C configuration. The absence of external timing components reduces bill-of-materials cost, PCB footprint, and design validation effort.