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NXP Semiconductors PCU9955ATWJ
- Part No.:
- PCU9955ATWJ
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
PCU9955ATWJ.pdf
- Description:
- IC LED DRV LIN PWM 57MA 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,803
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Product details
Overview
PCU9955ATWJ from NXP Semiconductors is a 16-channel Ultra Fast-mode (UFm) I²C-bus constant-current LED driver optimized for RGBA LED dimming and blinking in amusement products. It delivers 57 mA per channel, supports 20 V LED supply, features 8-bit individual PWM (31.25 kHz), 8-bit group PWM (122 Hz to 16.8 s), and integrated gradation control with ramp-up/down timing.
For engineers reviewing the PCU9955ATWJ datasheet, PCU9955ATWJ pinout, PCU9955ATWJ application, or PCU9955ATWJ equivalent, this device enables synchronized multi-LED fading, hardware blink control via OE, high-speed 5 MHz I²C configuration, and thermal shutdown protection in HTSSOP28 packaging.
Technical Context
The PCU9955ATWJ implements dual PWM architecture: per-channel 31.25 kHz PWM for precise brightness control and programmable group PWM (15 Hz–16.8 s) for coordinated dimming/blinking. Its UFm I²C interface operates at up to 5 MHz with write-only operation-no status registers or read capability.
Gradation control is managed across four independent groups, each with configurable ramp rate, step time (0.5–512 ms), hold-on/off time (0–6 s), and final output current. All 16 channels support assignment to gradation mode or normal mode, with software-selectable group addressing (All Call + three Sub Call addresses) enabling synchronized control of mixed-device arrays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 16 constant-current sink outputs, each programmable for off/on/PWM/group-PWM operation |
| Max Output Current | 57 mA per channel, adjustable via external REXT resistor and 8-bit DAC (225 µA–57 mA) |
| LED Supply Tolerance | Up to 20 V on LED outputs when OFF-enables high-Vf RGB/RGBA strings without external FETs |
| I²C Interface | Ultra Fast-mode (UFm), 5 MHz max clock, write-only protocol-no readback, no status registers |
| PWM Resolution | 8-bit (256-step) individual brightness control at 31.25 kHz; 8-bit group dimming/blinking at 122 Hz base frequency |
| Operating Voltage | VDD = 3.0 V to 5.5 V; non-LED pins tolerate up to 5.5 V-compatible with 3.3 V and 5 V logic systems |
| Thermal Protection | Built-in overtemperature detection with automatic thermal shutdown-prevents damage during sustained high-current operation |
Pinout & Package
Package: HTSSOP28 (SOT1172-3), thermally enhanced thin shrink small outline package with exposed die pad soldered to PCB ground for optimal thermal dissipation.
| 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 linear range) |
| AD0–AD2 (Pins 2–4) | Quinary address inputs | Each accepts 5 states (GND/VDD/floating/pull-up/pull-down) to configure one of 125 unique I²C slave addresses |
| OE (Pin 5) | Active-low output enable | Hardware blink/dimming control-overrides all PWM settings when asserted; enables synchronized multi-device blinking |
| LED0–LED15 (Pins 6–9, 11–18, 20–23) | Constant-current LED sinks | 16 dedicated open-drain outputs; each capable of sinking up to 57 mA with 20 V tolerance when OFF |
| RESET (Pin 25) | Active-low hardware reset | Asynchronous reset that forces all registers to POR state-output current switches OFF, registers return to defaults |
| USCL / USDA (Pins 26–27) | UFm I²C clock/data lines | 5 MHz-capable bus interface; USDA is bidirectional but only write operations supported-no readback capability |
| VDD (Pin 28) / VSS (Pins 5,10,19,24) | Power supply and ground | VDD = 3.0–5.5 V; all VSS pins plus exposed thermal pad must be connected to system ground for stable operation and thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Four independent gradation groups | Each group supports programmable ramp-up/down rate, step time (0.5–512 ms), hold times (0–6 s), and final current-enabling complex fade-in/fade-out sequences without MCU intervention |
| Software-configurable I²C addressing | One All Call (E0h) and three Sub Call (default ECh) addresses allow broadcast commands to all devices or subsets-reducing I²C traffic for marquee effects or color-group updates |
| Hardware blink synchronization | Active-low OE pin enables simultaneous blinking across multiple PCU9955ATWJ devices-eliminates software timing skew in large LED arrays |
| Output current accuracy | ±4 % matching between channels, ±6 % matching between devices-ensures uniform brightness across multi-chip LED panels |
| No-glitch power-up behavior | Outputs remain OFF until first valid I²C command-prevents unintended LED flash during system boot or brownout recovery |
Applications
| Amusement Lighting Control | RGB Status Indication |
|---|---|
Use Scenario: Dynamic lighting in arcade cabinets, prize wheels, and interactive kiosks requiring synchronized color fades and strobing effects. IC Role / Device Role / Timing Role: Primary LED driver managing 16 RGBA channels with hardware blink (OE) and group PWM for scene transitions. Use Value: Enables smooth breath-light effects and rapid pattern changes using gradation control-reducing MCU load and eliminating visible stepping artifacts. | Use Scenario: Multi-color status indicators on industrial HMIs, medical equipment panels, and network routers where color-coded alerts require precise intensity control. IC Role / Device Role / Timing Role: Constant-current sink driver delivering calibrated 57 mA per channel with 8-bit individual PWM resolution at 31.25 kHz. Use Value: Ensures consistent LED brightness across temperature and supply voltage variations-critical for regulatory-compliant visual signaling. |
| LED Display Backlighting | Keypad Illumination |
Use Scenario: Edge-lit or direct-lit backlighting for small-format LCD displays in handheld gaming devices and portable test instruments. IC Role / Device Role / Timing Role: High-efficiency current sink providing uniform illumination across 16 parallel LED strings with thermal shutdown protection. Use Value: Supports 20 V LED supply tolerance-enables use of higher-Vf white LEDs without external boost circuitry, simplifying BOM. | Use Scenario: Backlighting for membrane keypads in consumer electronics and automotive infotainment systems requiring low-power, long-life illumination. IC Role / Device Role / Timing Role: Low-quiescent-current LED driver operating from 3.3 V supply with programmable dimming curves (linear/exponential). Use Value: Reduces standby current consumption while maintaining responsive brightness adjustment-extending battery life in portable applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5940RTQR | 40-pin QFN; 16-channel, 12-bit PWM (4096 steps); 30 MHz SPI interface; no UFm I²C or gradation control | Requires SPI host controller; lacks built-in fade sequencing-needs MCU firmware for ramping | Choose for higher PWM resolution and faster update rates where SPI is available and gradation automation is not required. |
| PCA9955B | Same HTSSOP28 package; Fast-mode Plus I²C (1 MHz); identical register map and pinout; lacks UFm speed and gradation group registers | Compatible drop-in replacement for legacy designs; cannot achieve 5 MHz data throughput or hardware-assisted fading | Choose for cost-sensitive upgrades of existing PCA9955A/PCA9955B systems where 1 MHz I²C bandwidth suffices and gradation is handled externally. |
Compared with TLC5940RTQR and PCA9955B, the PCU9955ATWJ uniquely combines 5 MHz UFm I²C, integrated gradation control with four independent groups, and hardware blink synchronization via OE-making it optimal for amusement-grade LED systems demanding both speed and autonomous visual effects.
Availability
PCU9955ATWJ is available at Aetrix Electronics and suitable for amusement lighting control, RGB status indication, and LED display backlighting requiring stable component supply, thermal robustness, and high-speed I²C configurability.
Supply support for PCU9955ATWJ 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The PCU9955ATWJ belongs to NXP's Ultra Fast-mode I²C LED driver family, designed specifically for high-refresh-rate, multi-color LED control in entertainment and human-machine interface systems where synchronized visual effects and minimal MCU overhead are critical.
FAQ
What is the maximum I²C bus speed supported by the PCU9955ATWJ?
The PCU9955ATWJ supports Ultra Fast-mode (UFm) I²C operation up to 5 MHz-significantly faster than standard Fast-mode Plus (1 MHz). This enables rapid configuration of all 16 channels and gradation parameters, reducing bus latency in time-critical LED animation sequences. The PCU9955ATWJ implements write-only communication, so no read cycles affect throughput.
Does the PCU9955ATWJ support reading back register values or status information?
No, the PCU9955ATWJ does not support read operations. As a UFm I²C-bus slave device, it operates in receive-only mode-only writes are permitted. There are no status registers or readback capability. Configuration must be verified through external monitoring or deterministic initialization sequences. This design choice enables the 5 MHz speed and simplifies internal architecture.
How many unique I²C addresses can be assigned to PCU9955ATWJ devices on a single bus?
The PCU9955ATWJ supports up to 125 unique I²C slave addresses using its three quinary address pins (AD0–AD2), each configurable in five states (GND, VDD, floating, pull-up, pull-down). This allows dense deployment of multiple PCU9955ATWJ drivers on one bus-ideal for large-scale LED installations like video walls or interactive exhibits.
Can the PCU9955ATWJ drive LEDs with forward voltages exceeding 5.5 V?
Yes, the PCU9955ATWJ LED outputs tolerate up to 20 V when OFF, allowing direct connection to high-Vf RGB/RGBA LED strings (e.g., series-connected white or blue LEDs) without external high-side switches or boost converters. The 57 mA sink capability and 3–5.5 V VDD supply operate independently from the LED anode voltage, simplifying power architecture.
What is the function of the OE (Output Enable) pin on the PCU9955ATWJ?
The active-low OE pin on the PCU9955ATWJ provides hardware-level override of all LED outputs-enabling synchronized blinking or dimming across multiple devices without I²C commands. When asserted, OE forces all 16 channels into blink mode using the group PWM settings, making it ideal for emergency strobes or master-synced visual effects in amusement systems.
PCU9955ATWJ 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
PCU9955ATWJ FAQ
1.How can I place an order for PCU9955ATWJ through Aetrix?
Please submit a Request for Quotation (RFQ) for PCU9955ATWJ 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 PCU9955ATWJ reliable?
The price and inventory of PCU9955ATWJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCU9955ATWJ is usually 5 days.
3.What payment methods are accepted for PCU9955ATWJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCU9955ATWJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCU9955ATWJ?
PCU9955ATWJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCU9955ATWJ 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 PCU9955ATWJ?
For technical support, including PCU9955ATWJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCU9955ATWJ requirements.
6.How does Aetrix verify that PCU9955ATWJ is sourced from the original manufacturer or authorized distributors?
All PCU9955ATWJ 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 PCU9955ATWJ meets industry standards.
7.What is the process for return or replacement of PCU9955ATWJ?
All PCU9955ATWJ units undergo pre-shipment inspection (PSI). If there is an issue with PCU9955ATWJ, 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 PCU9955ATWJ part is unused and in its original packaging.
Return procedure for PCU9955ATWJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCU9955ATWJ Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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