NXP Semiconductors PCA9552D,112

Overview

The PCA9552D,112 from NXP Semiconductors (originally Philips) is a 16-bit I²C-bus LED blinker IC with dual programmable blink rates, 16 open-drain outputs (25 mA per channel, 200 mA total), internal oscillator, and GPIO capability. It operates from 2.3 V to 5.5 V, supports up to 400 kHz I²C clock, and features active-low RESET and hardware address pins (A0–A2) for eight-device bus addressing - used in front-panel status indicators, industrial HMI displays, and embedded system activity lights.

For engineers reviewing the PCA9552D,112 datasheet, PCA9552D,112 pinout, PCA9552D,112 application, or PCA9552D,112 equivalent, this page delivers verified electrical parameters, SO24 package mapping, confirmed blink rate range (0.172–44 Hz), GPIO reuse capability, and real-world timing behavior - all validated against the official Rev. 05 product data sheet dated 9 March 2006.

Technical Context

The PCA9552D,112 integrates two independent PWM generators (BLINK0/BLINK1) driven by prescaler registers (PSC0/PSC1) and duty-cycle registers (PWM0/PWM1), enabling simultaneous blinking of different LED groups at distinct frequencies and duty cycles. Its internal oscillator eliminates external timing components, and noise filtering on SCL/SDA ensures robust I²C communication in electrically noisy environments.

Each of the 16 LEDn outputs is individually configurable via four LED selector registers (LS0–LS3) to operate as ON, OFF, BLINK0, or BLINK1 - with no software polling required after initial setup. The device implements Power-On Reset (POR) and active-low hardware RESET, both initializing all registers to default states (all bits HIGH = LEDs off).

Key Specifications

Pinout & Package

PCA9552D,112 is supplied in SO24 (SOT137-1) package: plastic small outline, 24 leads, 7.5 mm body width, surface-mount, with standard 0.65 mm lead pitch and pin 1 index marker.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCA6507PWR and PCA9635PW, the PCA9552D,112 uniquely combines dual independent blink rates, GPIO reuse, and zero-external-component timing - making it optimal for applications demanding autonomous, low-overhead LED management across 16 channels.

Availability

PCA9552D,112 is available at Aetrix Electronics and suitable for industrial HMI panels, embedded system status indicators, consumer electronics power/status displays, and test equipment visual feedback requiring stable component supply and long-term manufacturability.

Supply support for PCA9552D,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 - formed from the spin-off of Philips Semiconductors in 2006.

The PCA9552D,112 belongs to NXP's legacy I²C peripheral portfolio, designed specifically for reducing MCU resource load in LED-intensive embedded systems through autonomous, register-configurable blink control.

FAQ

What is the maximum sink current per output on the PCA9552D,112?

The PCA9552D,112 supports up to 25 mA sink current per LEDn output pin. The total package sink current is limited to 200 mA, meaning no more than eight outputs may operate at full 25 mA simultaneously. This rating is specified under VDD = 2.3–5.5 V and ambient temperature −40 °C to +85 °C, per the official datasheet Rev. 05.

Does the PCA9552D,112 require external components for its blink oscillator?

No, the PCA9552D,112 includes an internal oscillator that requires no external resistors, capacitors, or crystals. Blink rates are fully programmable via PSC0/PSC1 (prescaler) and PWM0/PWM1 (duty cycle) registers - enabling 0.172 Hz to 44 Hz operation without added BOM cost or layout complexity.

Can unused LED pins on the PCA9552D,112 be used as general-purpose I/Os?

Yes, LED0–LED15 pins not configured for blinking or static LED control can serve as GPIOs. In input mode, configure the pin as high-impedance (01) and read its state via INPUT0/INPUT1 registers. In output mode, use external pull-up resistors and program the LED selector register to drive LOW or HIGH-impedance states - supporting basic digital interfacing.

What is the I²C address range supported by the PCA9552D,112?

The PCA9552D,112 uses a 7-bit I²C slave address with three hardware-selectable bits (A0, A1, A2), yielding addresses from 0x60 to 0x67. The base address is 0x60 (A2=A1=A0=0); each address pin adds 1 to the LSB. No internal pull-ups exist on these pins - external termination is required for reliable bus operation.

How does the PCA9552D,112 handle power-on and hardware reset?

The PCA9552D,112 incorporates both Power-On Reset (POR) and active-low hardware RESET. POR initializes all registers to default states (all outputs HIGH = LEDs off) when VDD rises above VPOR (~1.7–2.2 V). The RESET pin provides asynchronous reset - holding it LOW for ≥10 ns forces register reinitialization, regardless of I²C activity or VDD level.