NXP Semiconductors PCU9655PW,518

Overview

PCU9655PW,518 from NXP Semiconductors is a 16-channel Ultra Fast-mode (UFm) I²C-bus LED driver optimized for RGBA LED voltage-switch dimming and synchronized blinking. It delivers individual 8-bit PWM control per channel at 31.25 kHz (0–99.6% duty), group-level 8-bit dimming/blinking at 122 Hz fixed or 15 Hz–16.8 s programmable frequency, 100 mA sink capability per output, and 40 V LED voltage tolerance - enabling high-fidelity color mixing in compact display interfaces.

For engineers reviewing the PCU9655PW,518 datasheet, PCU9655PW,518 pinout, PCU9655PW,518 application, or PCU9655PW,518 equivalent, this page provides verified functional context, TSSOP28 package mapping, confirmed register-level control behavior, thermal shutdown protection, and validated alternative options for multi-LED system design with timing-critical I²C bus efficiency.

Technical Context

The PCU9655PW,518 implements dual-layer PWM architecture: each of its 16 open-drain outputs features independent 8-bit brightness control via dedicated 31.25 kHz PWM generators, while a shared group PWM engine supports either global dimming (122 Hz fixed) or programmable blinking (15 Hz to 16.8 s period). Its UFm interface operates unidirectionally at up to 5 MHz, requiring no external oscillator thanks to an integrated 8 MHz internal clock.

Hardware address configuration uses five pins (A0–A4) for up to 32 devices on one bus; software-defined addressing includes one All Call (A0h) and three Sub Call (ACh) I²C addresses, enabling hierarchical control of LED groups without bus congestion. Output state transitions are configurable to occur on STOP or Acknowledge, ensuring deterministic update timing across cascaded drivers.

Key Specifications

Pinout & Package

TSSOP28 package (SOT361-1) with 4.4 mm body width, designed for space-constrained PCB layouts and reflow-compatible manufacturing. Pin functions validated per NXP datasheet Rev. 2 (2012).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC59401PWP and PCA9685PW, the PCU9655PW,518 uniquely combines UFm I²C speed (5 MHz), integrated group blink/dim functionality, 100 mA drive, and thermal safety - making it optimal for responsive, robust, medium-power LED systems where bus efficiency and visual coordination matter.

Availability

PCU9655PW,518 is available at Aetrix Electronics and suitable for RGB status indicators, keypad backlights, amusement lighting effects, and small-screen LCD backlights requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for PCU9655PW,518 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 mixed-signal IC design and embedded processing.

The PCU9655PW,518 belongs to NXP's Ultra Fast-mode LED driver family, engineered specifically for high-speed, low-overhead I²C control of multi-color LED arrays in space-constrained, thermally demanding environments.

FAQ

What is the maximum I²C bus speed supported by the PCU9655PW,518?

The PCU9655PW,518 supports Ultra Fast-mode (UFm) I²C operation at up to 5 MHz - significantly faster than standard (100 kHz) or fast-mode (400 kHz) I²C. This enables rapid updates across all 16 channels without bus contention, critical for real-time LED animation in interactive displays. The interface is write-only and requires no external pull-up components beyond standard I²C bus design.

Does the PCU9655PW,518 support both individual LED brightness and synchronized blinking?

Yes, the PCU9655PW,518 supports concurrent individual and group control: each of its 16 channels has an 8-bit PWM register (31.25 kHz, 0–99.6% duty) for independent brightness, while the GRPPWM and GRPFREQ registers enable synchronized dimming (122 Hz fixed) or programmable blinking (15 Hz to 16.8 s period). This dual-layer control is implemented entirely in hardware - no host CPU cycles are consumed during PWM generation.

What is the purpose of the OFFSET register in the PCU9655PW,518?

The OFFSET register (address 3Ah) introduces programmable turn-on delay between successive LED outputs - from 0 ns (all channels simultaneous) to 1.875 µs (15 × 125 ns) in 125 ns increments. This staggered activation reduces peak inrush current on the VDD rail and suppresses conducted EMI, especially important in battery-powered or noise-sensitive systems like handheld test gear or medical devices using the PCU9655PW,518.

Can multiple PCU9655PW,518 devices share the same I²C bus?

Yes - up to 32 PCU9655PW,518 devices can coexist on a single UFm I²C bus using five hardware address pins (A0–A4). Additionally, software-configurable All Call (A0h) and three Sub Call (ACh) addresses allow grouped commands (e.g., "turn all red LEDs ON") without individual addressing, drastically reducing I²C transaction count in large LED arrays managed by the PCU9655PW,518.

What protection features does the PCU9655PW,518 include?

The PCU9655PW,518 integrates thermal shutdown that disables all outputs if the internal junction temperature exceeds the safe operating threshold - preventing permanent damage during sustained overload or poor heatsinking. It also includes input noise filters on USCL/USDA lines, 5.5 V-tolerant logic inputs, and glitch-free power-up behavior (all outputs default OFF), ensuring reliable operation in electrically harsh environments where the PCU9655PW,518 is deployed.