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NXP Semiconductors PCU9955TW,118
- Part No.:
- PCU9955TW,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
PCU9955TW,118.pdf
- Description:
- IC LED DRV LIN PWM 57MA 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,382
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Product details
Overview
PCU9955TW,118 from NXP Semiconductors is a 16-channel Ultra-Fast-mode I²C-bus constant-current LED driver optimized for RGBA LED dimming and blinking in amusement products. It delivers 57 mA per channel with 8-bit individual PWM (31.25 kHz), 8-bit group PWM (122 Hz fixed or 15 Hz–16.8 s adjustable), and programmable output current from 225 µA to 57 mA via external resistor. Operating from 3 V to 5.5 V, it supports up to 40 V LED supply voltage and integrates open/short load and overtemperature detection.
For engineers reviewing the PCU9955TW,118 datasheet, PCU9955TW,118 pinout, PCU9955TW,118 application, or PCU9955TW,118 equivalent, key selection criteria include UFm I²C compatibility (5 MHz write-only interface), thermal shutdown protection, hardware address pin configuration (A0–A3), HTSSOP28 package constraints, and group/individual PWM mixing capability for synchronized RGB lighting effects.
Technical Context
The PCU9955TW,118 implements dual-layer PWM control: each of its 16 constant-current sink outputs features an independent 31.25 kHz, 256-step brightness register (PWM0–PWM15), while a shared group controller (GRPPWM/GRPFREQ) enables synchronized dimming at 122 Hz or blinking across 15 Hz–16.8 s. Its 5 MHz Ultra-Fast-mode I²C interface operates receive-only - no status registers exist, and all communication is write-based with software reset (SWRST) support.
Internal architecture includes an 8 MHz oscillator (no external components required), auto-increment addressing modes controlled by MODE1 bits AI1/AI0, and four configurable I²C sub-call addresses (All Call + three Sub Calls) enabling hierarchical group control. Output state selection (off/on/individual/group) is managed per channel via LEDOUT0–LEDOUT3 registers, with change-on-STOP default for synchronized updates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 16 constant-current sink outputs, each programmable for off/on/individual/group control |
| Max Output Current | 57 mA per channel, adjustable from 225 µA to 57 mA via external REXT |
| Individual PWM | 31.25 kHz fixed frequency, 256-step linear duty cycle (0–99.6%) per LEDn |
| Group PWM | 122 Hz fixed dimming or 15 Hz–16.8 s adjustable blinking, 256-step duty cycle (0–99.6%) |
| I²C Interface | Ultra-Fast-mode (UFm), 5 MHz max clock, write-only - no readback or status registers |
| Supply Range | VDD = 3 V to 5.5 V; LED supply tolerance up to 40 V on OFF-state outputs |
| Operating Temp | −40 °C to +85 °C; integrated thermal shutdown protects above safe junction limit |
Pinout & Package
PCU9955TW,118 is housed in a 28-pin HTSSOP package (SOT1172-2) with 0.65 mm pitch, 4.4 mm body width, and exposed thermal pad connected to VSS. Pin assignment follows standard NXP layout with dedicated I²C lines (USCL/USDA), four hardware address inputs (A0–A3), active-low RESET, REXT current-setting input, 16 LED sink outputs (LED0–LED15), and three VSS pins plus one VDD pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REXT (Pin 1) | Current reference input | Connects external resistor to ground to set full-scale output current (225 µA–57 mA) |
| A0–A3 (Pins 2–5) | Hardware I²C address inputs | Configure unique slave address; require external pull-up/down for deterministic operation |
| USCL / USDA (Pins 26/27) | UFm I²C clock/data inputs | 5 MHz compatible; noise-filtered inputs tolerate 5.5 V; receive-only interface |
| RESET (Pin 25) | Active-low asynchronous reset | Hard reset clears all registers to power-on defaults; complements SWRST command |
| LED0–LED15 (Pins 6–9, 11–18, 20–23) | Constant-current LED sink outputs | Each drives one LED cathode; tolerate 40 V when OFF; support individual/group PWM mixing |
| VDD (Pin 28) / VSS (Pins 10,19,24) | Power and ground | VDD: 3–5.5 V supply; VSS pins and exposed thermal pad must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel constant-current sinking | Each output independently controllable for off/on/brightness/group mode - eliminates external current-setting resistors per LED |
| Dual PWM hierarchy | 31.25 kHz individual PWM + 122 Hz/adjustable group PWM enables precise color mixing and synchronized blink/dim effects |
| UFm I²C group addressing | Four software-programmable I²C addresses (All Call + three Sub Calls) allow selective control of LED groups without bus congestion |
| Output enable delay | Programmable offset timing per LEDn reduces EMI and inrush current during state transitions |
| Thermal & fault protection | Built-in overtemperature shutdown, open-load detection, and short-circuit monitoring ensure robust operation in high-density LED arrays |
Applications
| Amusement Lighting Control | RGB Status Indication |
|---|---|
Use Scenario: Dynamic lighting in arcade cabinets, prize wheels, and interactive game panels requiring synchronized color shifts and rhythmic blinking. IC Role / Device Role / Timing Role: PCU9955TW,118 acts as the primary LED driver, managing 16 RGBA channels with individual brightness and global blink timing. Use Value: Enables real-time, flicker-free animation using 31.25 kHz individual PWM and 15 Hz–16.8 s group blink - critical for visual engagement without perceptible strobing. | Use Scenario: Multi-color status feedback on industrial HMI panels, medical device interfaces, and network equipment front panels. IC Role / Device Role / Timing Role: PCU9955TW,118 provides reliable, low-noise LED drive with programmable on/off states and calibrated brightness levels per indicator. Use Value: Delivers consistent luminance across channels (±6% matching) and eliminates power-up glitches - ensuring accurate, trustworthy status signaling. |
| Keypad Backlighting | LED Display Segments |
Use Scenario: Backlighting for membrane keypads in handheld devices, POS terminals, and ruggedized field instruments. IC Role / Device Role / Timing Role: PCU9955TW,118 drives discrete LEDs behind keypad overlays using individual PWM for uniform illumination and group dimming for ambient adaptation. Use Value: Supports low standby current and 3–5.5 V operation - ideal for battery-powered systems requiring long runtime and wide input voltage tolerance. | Use Scenario: Driving alphanumeric or segmented LED displays in vending machines, ticket kiosks, and transportation signage. IC Role / Device Role / Timing Role: PCU9955TW,118 serves as a scalable segment driver, assigning multiple outputs to common-anode/cathode segments with coordinated brightness control. Use Value: Leverages 16-channel flexibility and 57 mA per output to drive high-brightness segments without external transistors - reducing BOM count and board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9955B,118 | Same 16-channel architecture but Fast-mode Plus I²C (1 MHz), not UFm; lacks 5 MHz support and group blink period adjustability | Suitable for cost-sensitive designs where 1 MHz bus speed suffices and fixed 122 Hz group dimming is acceptable | Choose PCA9955B,118 only if UFm bandwidth and variable blink timing are unnecessary |
| TLC5940RTQR | 16-channel, 12-bit PWM (4096 steps), 30 MHz SPI interface; no built-in group PWM or UFm I²C; requires external clock | Better suited for high-resolution grayscale displays; lacks integrated fault detection and thermal shutdown | Select TLC5940RTQR when >8-bit brightness resolution is mandatory and SPI infrastructure exists |
Compared with PCA9955B,118 and TLC5940RTQR, the PCU9955TW,118 uniquely combines 5 MHz UFm I²C control, programmable group blink timing (15 Hz–16.8 s), and integrated thermal/fault protection - making it optimal for responsive, safety-critical amusement and industrial LED systems.
Availability
PCU9955TW,118 is available at Aetrix Electronics and suitable for amusement lighting control, RGB status indication, keypad backlighting, and LED display segments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCU9955TW,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, and IoT applications, with deep expertise in interface, power, and LED control ICs.
The PCU9955TW,118 belongs to NXP's Ultra-Fast-mode I²C LED driver family, designed specifically for high-speed, multi-channel LED animation in entertainment and human-interface systems where synchronized brightness and blink control are essential.
FAQ
What is the maximum I²C clock frequency supported by PCU9955TW,118?
The PCU9955TW,118 supports Ultra-Fast-mode I²C up to 5 MHz. It operates receive-only - only write operations are permitted, and no status registers or readback capability exist. This high-speed interface enables rapid updates of all 16 LED channels, critical for smooth animation in amusement products where PCU9955TW,118 is deployed.
How does PCU9955TW,118 handle thermal protection?
The PCU9955TW,118 integrates thermal shutdown circuitry that disables all LED outputs when internal junction temperature exceeds the safe operating limit. Recovery occurs automatically after cooling. This feature protects both the PCU9955TW,118 and connected LEDs during sustained high-current operation or poor heatsinking - a key reliability element in enclosed amusement enclosures where PCU9955TW,118 is commonly used.
Can PCU9955TW,118 drive LEDs with different forward voltages simultaneously?
Yes - PCU9955TW,118's constant-current sink architecture allows simultaneous driving of mixed-color LEDs (e.g., red, green, blue, amber) with varying forward voltages, as each channel regulates current independently. The 40 V LED supply tolerance ensures headroom for series-connected LEDs or high-Vf configurations, making PCU9955TW,118 suitable for RGBA lighting systems where precise current matching matters more than voltage matching.
What is the function of the REXT pin on PCU9955TW,118?
The REXT pin (Pin 1) on PCU9955TW,118 sets the full-scale output current for all 16 channels via an external resistor to ground. Using the formula IOUT = 10.75 mA × (25.6 kΩ / REXT), designers can scale output from 225 µA to 57 mA. This single-point calibration simplifies BOM and ensures tight channel-to-channel current matching (±6%) within each PCU9955TW,118 device.
Does PCU9955TW,118 support simultaneous update of all LED outputs?
Yes - PCU9955TW,118 defaults to "change on STOP" output update mode, meaning all 16 LED states commit synchronously upon I²C STOP condition. This prevents visible tearing or partial updates during animation sequences. The MODE2 register bit OCH allows switching to "change on ACK" for byte-level updates, but STOP-synchronized operation is the factory default and recommended for coherent visual effects in PCU9955TW,118 applications.
PCU9955TW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 20V
- Current - Output / Channel:
- 57mA
- Frequency:
- 8MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
PCU9955TW,118 FAQ
1.How can I place an order for PCU9955TW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCU9955TW,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCU9955TW,118 reliable?
The price and inventory of PCU9955TW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCU9955TW,118 is usually 5 days.
3.What payment methods are accepted for PCU9955TW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCU9955TW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCU9955TW,118?
PCU9955TW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCU9955TW,118 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCU9955TW,118?
For technical support, including PCU9955TW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCU9955TW,118 requirements.
6.How does Aetrix verify that PCU9955TW,118 is sourced from the original manufacturer or authorized distributors?
All PCU9955TW,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCU9955TW,118 meets industry standards.
7.What is the process for return or replacement of PCU9955TW,118?
All PCU9955TW,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCU9955TW,118, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCU9955TW,118 part is unused and in its original packaging.
Return procedure for PCU9955TW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCU9955TW,118 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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