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NXP Semiconductors PCA9955TW/S911118
- Part No.:
- PCA9955TW/S911118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
PCA9955TW/S911118.pdf
- Description:
- LED DRIVER, 16-SEGMENT, PDSO28
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
PCA9955TW/S911118 from NXP Semiconductors is a 16-channel I²C-bus constant-current LED driver optimized for RGBA LED dimming and blinking in amusement products. It delivers up to 57 mA per channel, supports 8-bit individual PWM (31.25 kHz) and 8-bit group PWM (122 Hz fixed or 15 Hz–16.8 s programmable), and operates from 3 V to 5.5 V with 40 V LED supply tolerance.
For engineers reviewing the PCA9955TW/S911118 datasheet, PCA9955TW/S911118 pinout, PCA9955TW/S911118 application, or PCA9955TW/S911118 equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for LED driver selection in RGB lighting systems requiring synchronized dimming, fault detection, and bus scalability.
Technical Context
The PCA9955TW/S911118 implements dual-layer PWM control: per-channel 31.25 kHz PWM for precise brightness setting and a shared group PWM with programmable frequency (15 Hz to 16.8 s period) and 0–99.6% duty cycle for coordinated blinking or global dimming. Its Fast-mode Plus I²C interface supports up to 1 MHz and 4000 pF bus capacitance, enabled by 30 mA SDA drive strength.
It integrates open/short load and overtemperature detection with register-accessible error flags, thermal shutdown protection, and an internal 8 MHz oscillator eliminating external timing components. Four hardware address pins (A0–A3) allow up to 16 devices on one I²C bus, while three software-configurable Sub Call addresses enable grouped command execution across mixed-channel LED drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 16 constant-current sink outputs, each programmable for off/on/PWM control |
| Max Output Current | 57 mA per channel, adjustable via external REXT resistor (225 µA–57 mA range) |
| Individual PWM | 8-bit resolution (256 steps), 31.25 kHz fixed frequency, 0–99.6% duty cycle |
| Group PWM | 8-bit resolution, 122 Hz fixed or 15 Hz–16.8 s programmable frequency, 0–99.6% duty cycle |
| I²C Interface | Fast-mode Plus (Fm+), up to 1 MHz, 30 mA SDA drive, 4000 pF bus capacitance support |
| Supply Range | VDD = 3 V to 5.5 V; LED supply up to 40 V (channel OFF state) |
| Operating Temp | −20 °C to +85 °C (industrial grade, per PCA9955TW variant) |
Pinout & Package
PCA9955TW/S911118 uses the HTSSOP28 package (SOT1172-2): thermally enhanced thin shrink small outline, 28 leads, 0.65 mm pitch, 4.4 mm body width, with exposed thermal pad connected to VSS.
| 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 | Four binary-selectable address bits enabling up to 16 unique device addresses on one bus |
| LED0–LED15 (Pins 6–9, 11–14, 15–18, 20–23) | Constant-current LED sink outputs | 16 independent channels; each tolerates up to 40 V when OFF and sinks up to 57 mA |
| RESET (Pin 25) | Active-low asynchronous reset | Hard-resets all registers to power-on defaults, disabling all LED outputs |
| SCL / SDA (Pins 26 / 27) | I²C clock/data bidirectional lines | Fm+ compliant; SDA supports 30 mA drive for high-capacitance bus robustness |
| VDD (Pin 28), VSS (Pins 10, 19, 24) | Power and ground | VDD = 3–5.5 V; all VSS pins and exposed thermal pad must be connected to system ground |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel + group PWM mixing | Enables simultaneous individual brightness control and synchronized blinking/dimming without host CPU overhead |
| Open/short/overtemp detection | Hardware-monitored fault reporting via dedicated EFLAG registers, enabling real-time LED health diagnostics |
| Software Reset (SWRST) | Allows full register reinitialization over I²C-identical to power-on reset-without physical RESET pin assertion |
| LED Group/Sub Call addressing | One All Call + three programmable Sub Call addresses let firmware control subsets (e.g., all red LEDs) with single I²C writes |
| Output state update timing | Configurable to change on STOP (default) or ACK, preventing partial updates and ensuring atomic LED state transitions |
Applications
| Amusement Lighting Control | RGB Status Indication |
|---|---|
|
Use Scenario: Controlling synchronized color-chasing effects and dynamic intensity modulation across dozens of RGB LEDs in arcade cabinets and carnival games. IC Role / Device Role / Timing Role: Primary constant-current LED driver with dual PWM layers managing both per-LED hue/brightness and frame-level animation timing. Use Value: Eliminates need for external microcontroller PWM timers; enables smooth 31.25 kHz flicker-free dimming and independently timed blink sequences at 15 Hz–16.8 s intervals. |
Use Scenario: Driving multi-color status indicators on industrial HMI panels where LED reliability and fault visibility are critical. IC Role / Device Role / Timing Role: Fault-aware LED sink providing real-time open/short detection and thermal monitoring via I²C-readable error flags. Use Value: Reduces diagnostic firmware complexity; allows immediate identification of failed LEDs without external sensing circuitry. |
| Marquee Display Backlighting | Keypad Illumination |
|
Use Scenario: Uniform backlighting for segmented marquee signs using mixed-color LED strings, requiring consistent brightness scaling across large arrays. IC Role / Device Role / Timing Role: Scalable I²C-addressable driver supporting up to 16 devices (256 total channels) on one bus with group-call capability. Use Value: Enables centralized brightness adjustment across entire sign using All Call address, minimizing I²C traffic and host processing load. |
Use Scenario: Low-power keypad backlighting in handheld consumer devices where EMI reduction and surge current control are essential. IC Role / Device Role / Timing Role: LED driver with programmable output enable delay and noise-filtered I²C inputs to suppress switching transients during power-up. Use Value: Prevents LED pop-on and reduces conducted EMI during wake-up sequences, meeting CISPR 22 Class B emissions requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947 | 16-channel, 12-bit PWM (4096 steps), no group PWM; SPI interface only; max 120 mA/channel | Lacks I²C bus scalability and synchronized group blinking; better suited for high-resolution static displays | Choose when higher grayscale depth is required and I²C bus sharing is unnecessary |
| IS31FL3731 | 18-channel, 8-bit PWM, I²C interface, integrated auto-breathing; max 40 mA/channel; built-in frame buffer | Includes RAM-based frame storage for autonomous animation, but lower current drive and no open-load detection | Prefer for self-contained animated icons where host offloads pattern generation |
Compared with TLC5947 and IS31FL3731, PCA9955TW/S911118 uniquely combines Fm+ I²C scalability (16-device bus), hardware group blinking with wide frequency range, and comprehensive fault detection-all in a single industrial-grade package-making it optimal for amusement equipment requiring synchronized, reliable, and serviceable LED control.
Availability
PCA9955TW/S911118 is available at Aetrix Electronics and suitable for amusement lighting control, RGB status indication, marquee display backlighting, and keypad illumination requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for PCA9955TW/S911118 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in I²C interface IP and LED driver innovation.
The PCA9955TW/S911118 belongs to NXP's PCA99xx family of constant-current LED drivers, designed specifically for high-reliability, bus-scalable RGB/RGBA lighting in entertainment and human-interface systems demanding synchronized dimming, fault resilience, and low EMI.
FAQ
What is the maximum number of PCA9955TW/S911118 devices supported on a single I²C bus?
The PCA9955TW/S911118 features four hardware address pins (A0–A3), allowing up to 16 uniquely addressable units on one I²C bus. This enables scalable LED array control-e.g., 256 total channels-with minimal bus overhead and no address conflicts when pins are properly configured to VDD or VSS.
Does PCA9955TW/S911118 support both individual LED brightness and synchronized blinking?
Yes. PCA9955TW/S911118 provides two independent PWM layers: 16-channel 31.25 kHz individual PWM for precise per-LED brightness, and a shared group PWM with programmable frequency (15 Hz to once every 16.8 seconds) and 0–99.6% duty cycle for synchronized blinking or global dimming-both simultaneously active.
How does PCA9955TW/S911118 handle LED fault detection?
PCA9955TW/S911118 integrates hardware open-load, short-circuit, and overtemperature detection. Fault status is latched in dedicated EFLAG0/EFLAG1 registers (addresses 44h/45h) and readable over I²C. Thermal shutdown activates automatically if junction temperature exceeds safe limits, protecting the device and downstream LEDs.
What is the role of the REXT pin on PCA9955TW/S911118?
The REXT pin (Pin 1) connects to an external resistor to ground, setting the full-scale output current for all 16 channels. Using the formula IOUT = 10.7 mA × (24.7 kΩ / REXT), REXT adjusts current linearly from 225 µA to 57 mA-enabling precise current matching across LEDs without trimming resistors per channel.
Can PCA9955TW/S911118 replace PCA9952TW in an existing design?
No direct replacement: PCA9955TW/S911118 has four address pins (A0–A3) and no OE pin, whereas PCA9952TW has three address pins and an active-low OE for hardware blinking. Pin 5 is A3 on PCA9955TW/S911118 but OE on PCA9952TW-requiring PCB layout changes and firmware adaptation for group control functionality.
PCA9955TW/S911118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 57mA
- Frequency:
- 8MHz
- Dimming:
- Yes
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
PCA9955TW/S911118 FAQ
1.How can I place an order for PCA9955TW/S911118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9955TW/S911118 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 PCA9955TW/S911118 reliable?
The price and inventory of PCA9955TW/S911118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9955TW/S911118 is usually 5 days.
3.What payment methods are accepted for PCA9955TW/S911118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9955TW/S911118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9955TW/S911118?
PCA9955TW/S911118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9955TW/S911118 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 PCA9955TW/S911118?
For technical support, including PCA9955TW/S911118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9955TW/S911118 requirements.
6.How does Aetrix verify that PCA9955TW/S911118 is sourced from the original manufacturer or authorized distributors?
All PCA9955TW/S911118 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 PCA9955TW/S911118 meets industry standards.
7.What is the process for return or replacement of PCA9955TW/S911118?
All PCA9955TW/S911118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9955TW/S911118, 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 PCA9955TW/S911118 part is unused and in its original packaging.
Return procedure for PCA9955TW/S911118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9955TW/S911118 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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