NXP Semiconductors PCA9553D/02,112

Overview

The PCA9553D/02,112 from NXP Semiconductors is a 4-bit I²C-bus LED blinker with two fully programmable internal blink rates (0.172 Hz to 44 Hz), 4 open-drain LED drivers (25 mA per output, 100 mA total), 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-making it ideal for embedded status indication in space-constrained industrial control panels.

For engineers reviewing the PCA9553D/02,112 datasheet, PCA9553D/02,112 pinout, PCA9553D/02,112 application, or PCA9553D/02,112 equivalent, this device delivers deterministic LED blinking with minimal I²C bus traffic, supports hot insertion, includes noise filtering on SCL/SDA, and offers configurable PWM duty cycles via PSC0/PWM0 and PSC1/PWM1 registers.

Technical Context

The PCA9553D/02 implements a dual-PWM architecture with independent prescaler and pulse-width modulation registers (PSC0/PWM0 and PSC1/PWM1), enabling simultaneous control of two distinct blink frequencies and duty cycles. Its I²C slave address is fixed at 0xC6 (1100011b), differing from the /01 variant (0xC4) to allow coexistence on the same bus.

Each of the four LEDn outputs functions as an open-drain driver with programmable mode selection (ON/OFF/BLINK0/BLINK1) via the LS0 register. Power-on reset initializes all registers to default states, setting outputs HIGH (LED off) and disabling blink modes until configured.

Key Specifications

Pinout & Package

PCA9553D/02,112 is supplied in SO8 package (SOT96-1), 8-pin plastic small outline with 3.9 mm body width. Pin 1 is LED0; pin 4 is VSS (supply ground); pin 8 is VDD (supply voltage). All pins are electrically validated per NXP datasheet Rev. 06.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCA9553D/02,112, the PCA9553DP/02 offers identical functionality in a smaller TSSOP8 footprint, while PCA9553TK/02 delivers enhanced thermal performance in a leadless HVSON8 package-both retain full register compatibility and the fixed 0xC6 I²C address.

Availability

PCA9553D/02,112 is available at Aetrix Electronics and suitable for industrial HMI status panels, network equipment link indicators, medical device self-test sequences, and automotive infotainment standby indicators requiring stable component supply across long production lifecycles.

Supply support for PCA9553D/02,112 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, with deep expertise in I²C peripherals and low-power mixed-signal design.

The PCA9553 product line was designed specifically to reduce MCU resource loading in embedded systems requiring reliable, autonomous LED indication-delivering deterministic blink timing without consuming CPU cycles or timers.

FAQ

What is the I²C slave address of the PCA9553D/02,112?

The PCA9553D/02,112 has a fixed 7-bit I²C slave address of 0xC6 (1100011b), where the R/W bit is appended externally. This differs from the /01 variant (0xC4), enabling both versions to operate simultaneously on the same I²C bus without address conflict. The PCA9553D/02,112 address is hardwired and not configurable via hardware pins.

How do I configure two different blink rates on the PCA9553D/02,112?

To configure two blink rates on the PCA9553D/02,112, write values to PSC0/PWM0 registers for BLINK0 (e.g., PSC0 = 43 for 1 Hz period, PWM0 = 128 for 50 % duty cycle) and to PSC1/PWM1 registers for BLINK1 (e.g., PSC1 = 10 for 4 Hz, PWM1 = 192 for 25 %). Then set the LS0 register bits to assign individual LEDn outputs to either BLINK0 or BLINK1 mode.

Can unused LED pins on the PCA9553D/02,112 be used as general-purpose I/Os?

Yes-unused LED0–LED3 pins on the PCA9553D/02,112 can serve as GPIOs. Configure the corresponding LS0 bits to '01' (high-impedance) for input mode and read state via the INPUT register, or use external pull-ups with LS0 = '00' (LOW) or '10'/'11' (PWM-controlled) for output. No additional hardware is needed beyond standard I²C pull-ups.

Does the PCA9553D/02,112 require external components for its oscillator?

No-the PCA9553D/02,112 integrates a precision internal oscillator that requires no external resistors, capacitors, or crystals. This oscillator drives both BLINK0 and BLINK1 PWM engines, enabling fully autonomous LED blinking after initial register configuration. The absence of external timing components simplifies layout and improves reliability.

What is the maximum sink current per output on the PCA9553D/02,112?

The PCA9553D/02,112 supports a maximum sink current of 25 mA per LEDn output (pins 1, 2, 3, 5), with a total package limit of 100 mA. These ratings apply across the full operating temperature range (−40 °C to +85 °C) and supply voltage (2.3 V to 5.5 V). Exceeding either limit risks thermal shutdown or permanent damage to the PCA9553D/02,112.