NXP Semiconductors PCA9552D,118

Overview

PCA9552D,118 from NXP Semiconductors is a 16-bit I²C-bus LED driver with dual programmable blink rates (0.172–44 Hz), 25 mA per output sink capability, 2.3–5.5 V supply range, and integrated oscillator eliminating external timing components. It serves as an intelligent LED controller in embedded UIs, reducing MCU timer load and I²C bus traffic in industrial HMIs and telecom status panels.

For engineers reviewing the PCA9552D,118 datasheet, PCA9552D,118 pinout, PCA9552D,118 application, or PCA9552D,118 equivalent, key selection criteria include its dual independent PWM blink engines, GPIO reconfigurability of unused LED outputs, SO24 package compatibility with legacy layouts, and SMBus/I²C interoperability at up to 400 kHz.

Technical Context

The PCA9552D,118 implements two independent prescaler-PWM channels (PSC0/PWM0 and PSC1/PWM1) enabling simultaneous blinking at distinct frequencies and duty cycles-each programmable via I²C registers. Its internal oscillator operates without external components, delivering stable blink timing across –40 °C to +85 °C.

All 16 open-drain outputs support LED sinking or GPIO functions: configured as high-impedance for input reads, active-low for output control, or PWM-modulated via BLINK0/BLINK1 modes. Hardware address pins A0–A2 allow eight devices on one bus, while RESET (active LOW) and Power-On Reset ensure deterministic initialization.

Key Specifications

Pinout & Package

PCA9552D,118 uses the SO24 (SOT137-1) package: plastic small outline, 24-pin, 7.5 mm body width, surface-mount. Pin 1 index located at top-left corner with notch or dot marking.

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,118 uniquely balances autonomous dual-rate blinking, full GPIO reconfigurability, and industrial temperature support in a single SO24 package-making it optimal for complex status UIs where MCU resource conservation is critical.

Availability

PCA9552D,118 is available at Aetrix Electronics and suitable for industrial HMIs, telecom equipment panels, and medical device user interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for PCA9552D,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, IoT, and mobile applications.

The PCA9552D,118 belongs to NXP's I²C peripheral portfolio designed specifically for intelligent LED control in resource-constrained embedded systems-emphasizing bus efficiency, autonomous timing, and flexible I/O reuse.

FAQ

What is the maximum number of PCA9552D,118 devices that can share one I²C bus?

The PCA9552D,118 features three hardware address pins (A0–A2), allowing up to eight unique I²C addresses (0x60–0x67). This enables eight PCA9552D,118 devices to operate concurrently on a single I²C bus without address conflict, provided each has a distinct A0–A2 configuration. The PCA9552D,118 does not support address auto-detection or dynamic addressing.

Can unused LED outputs on the PCA9552D,118 be used as general-purpose inputs or outputs?

Yes-any LEDn pin on the PCA9552D,118 can function as a GPIO. To use as input, configure the corresponding LSn register bits to high-impedance (01) and read state via INPUT0 or INPUT1 registers. As output, drive LOW via LSn register (00) or PWM-modulate (10/11); external pull-up is required for HIGH-level assertion. The PCA9552D,118 supports this reconfiguration without hardware changes.

What are the valid blink frequency and duty cycle ranges for PCA9552D,118?

The PCA9552D,118 supports two independent blink rates: 0.172 Hz to 44 Hz (periods 5.82 s to 23 ms), set via 8-bit prescaler registers (PSC0/PSC1). Duty cycle is adjustable from 0 % to 100 % in 1/256 steps using 8-bit PWM registers (PWM0/PWM1), where duty = (256 − PWMx)/256. These values are confirmed in the Rev. 5.1 datasheet Section 6.3.3–6.3.6.

Does the PCA9552D,118 require external components for its internal oscillator?

No-the PCA9552D,118 integrates a fully self-contained oscillator requiring no external capacitors, resistors, or crystals. This oscillator drives both blink engines (BLINK0 and BLINK1) and is factory-trimmed for accuracy across voltage and temperature. The absence of external timing components simplifies design, reduces BOM cost, and improves reliability-confirmed in Section 2 Features and Figure 1 block diagram of the PCA9552D,118 datasheet.

What is the absolute maximum sink current per output and total package limit for PCA9552D,118?

The PCA9552D,118 specifies an absolute maximum sink current of ±25 mA per LEDn output pin (Table 13, IO(LEDn)). The total package current limit is 200 mA (ISS), enforced across all 16 outputs. Per datasheet Section 10, each octal group (LED0–LED7 and LED8–LED15) must be limited to ≤100 mA to stay within thermal and electrical limits-critical for sustained blink operation in the PCA9552D,118.