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NXP Semiconductors PCA9955TW/Q900,118
- Part No.:
- PCA9955TW/Q900,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
PCA9955TW/Q900,118.pdf
- Description:
- IC LED DRV LIN PWM 57MA 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,617
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Product details
Overview
PCA9955TW/Q900,118 from NXP Semiconductors is a 16-channel Fast-mode Plus (Fm+) I²C-bus constant current LED driver optimized for RGBA LED dimming and blinking in automotive lighting and amusement products. It delivers up to 57 mA per channel with 8-bit individual PWM (31.25 kHz) and 8-bit group PWM (122 Hz fixed or 15 Hz–16.8 s programmable), supports 40 V LED supply, and features open/short load and overtemperature detection.
For engineers reviewing the PCA9955TW/Q900,118 datasheet, PCA9955TW/Q900,118 pinout, PCA9955TW/Q900,118 application, or PCA9955TW/Q900,118 equivalent, this device is selected for high-channel-count, AEC-Q100-compliant LED control where synchronized group blinking, per-channel brightness precision, thermal fault reporting, and Fm+ bus robustness (1 MHz, 4000 pF) are required.
Technical Context
The PCA9955TW/Q900,118 implements dual PWM architecture: independent 31.25 kHz 256-step brightness control per channel and shared 122 Hz (or programmable 15 Hz–16.8 s) 256-step group control for coordinated dimming or blinking. Its 8-bit linear DAC adjusts output current from 225 μA to 57 mA via external REXT, with ±6 % inter-channel and ±8 % inter-device accuracy.
It integrates hardware address pins (A0–A3), four software-configurable I²C sub-call addresses (including All Call E0h), and error registers accessible via I²C for open/short/overtemperature detection. The HTSSOP28 package includes an exposed thermal pad tied to VSS for enhanced thermal dissipation in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 16 constant-current sink outputs, each independently controllable for on/off/brightness/group blink. |
| Max Output Current | 57 mA per channel, adjustable via external REXT; tolerates up to 40 V LED supply when OFF. |
| PWM Resolution & Frequency | 8-bit (256-step) individual PWM at 31.25 kHz; 8-bit group PWM at fixed 122 Hz or programmable 15 Hz–16.8 s. |
| I²C Interface | Fast-mode Plus (Fm+) compliant: 1 MHz max clock, 30 mA SDA drive strength, supports ≤4000 pF bus capacitance. |
| Supply Voltage | VDD = 3.0 V to 5.5 V; non-LED pins tolerate 5.5 V; operating temperature −40 °C to +85 °C. |
| Protection Features | Built-in open-load, short-circuit, and overtemperature detection; error flags readable via I²C registers. |
| Automotive Qualification | AEC-Q100 Grade 2 qualified (−40 °C to +105 °C junction), HTSSOP28 package with exposed thermal pad. |
Pinout & Package
PCA9955TW/Q900,118 uses the HTSSOP28 (SOT1172-2) package: 28-pin thermally enhanced thin shrink small outline with 0.65 mm pitch, 4.4 mm body width, and exposed die pad connected to VSS.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REXT) | Current set resistor input | Connects external resistor to ground to program full-scale output current (225 μA–57 mA). |
| 2–5 (A0–A3) | Hardware address inputs | Set unique I²C slave address; enables up to 16 devices on same bus (4-bit address space). |
| 6–23 (LED0–LED15) | Constant-current LED sink outputs | 16 dedicated channels; each sinks up to 57 mA; tolerate 40 V when OFF. |
| 25 (RESET) | Active-low reset input | Asynchronous hardware reset; initializes all registers to power-on defaults (outputs OFF). |
| 26 (SCL), 27 (SDA) | I²C bus interface | Fm+ compatible; SDA has 30 mA drive capability for high-capacitance buses. |
| 10, 19, 24, Exposed Pad (VSS) | Ground connections | All VSS pins and exposed thermal pad must be connected to system ground for operation and thermal management. |
| 28 (VDD) | Power supply input | 3.0 V–5.5 V logic supply; powers internal oscillator, registers, and control logic. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel brightness + group blink/dim mix | Each LEDn supports simultaneous individual PWM (31.25 kHz) and group PWM (122 Hz or programmable) for complex visual effects. |
| Software-addressable LED groups | Four programmable I²C addresses (All Call + three Sub Call) enable selective control of LED subsets-e.g., all red LEDs or marquee segments-without repeated commands. |
| Thermal and electrical fault monitoring | Real-time open/short load and overtemperature detection with register-accessible status flags for system-level diagnostics. |
| Low-glitch power-up behavior | No unintended LED turn-on at power-up; outputs remain OFF until explicitly configured via I²C. |
| Robust I²C bus interface | 1 MHz Fm+ support, noise filtering on SDA/SCL, and 30 mA SDA drive ensure reliable communication in noisy automotive environments. |
Applications
| Automotive Interior Lighting | RGB Status Indicators |
|---|---|
|
Use Scenario: Dynamic ambient lighting and multi-color status feedback in instrument clusters, door panels, and center consoles. IC Role / Device Role / Timing Role: 16-channel constant-current sink driving RGB/RGBA LEDs with synchronized group blinking and per-pixel brightness control. Use Value: Enables smooth color transitions and uniform intensity across multiple zones using single PCA9955TW/Q900,118, reducing MCU overhead and PCB footprint. |
Use Scenario: Real-time system status indication (e.g., power, fault, connectivity) using discrete RGB LEDs on industrial HMI or medical devices. IC Role / Device Role / Timing Role: Independent 8-bit brightness control per LED plus group PWM for unified alert patterns (e.g., slow blink on fault). Use Value: Eliminates need for external PWM controllers or discrete transistors; supports precise luminance matching across colors via calibrated REXT. |
| Amusement & Gaming Displays | Keypad Backlighting |
|
Use Scenario: Bright, flicker-free animated lighting in arcade cabinets, slot machines, and interactive kiosks requiring high reliability. IC Role / Device Role / Timing Role: High-current (57 mA) LED driver with 31.25 kHz individual PWM to suppress visible flicker and 122 Hz group blink for attention-grabbing effects. Use Value: Delivers consistent brightness at full current without thermal derating, supported by integrated overtemperature shutdown and fault reporting. |
Use Scenario: Low-profile, energy-efficient backlighting for membrane keypads in handheld test equipment and portable instrumentation. IC Role / Device Role / Timing Role: 16-channel sink driver enabling per-key brightness tuning and global dimming via I²C, minimizing GPIO usage. Use Value: Reduces BOM count by replacing 16 discrete drivers; supports soft-start via programmable LEDn output enable delay to limit inrush current. |
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 |
|---|---|---|---|
| TLC5940RTQR | 16-channel, 12-bit PWM (4096 steps), 30 MHz internal clock, no group PWM, requires external VREF and dot correction registers. | Lacks integrated group blinking, open/short detection, and AEC-Q100 qualification; suited for high-resolution display calibration, not automotive. | Select TLC5940RTQR only when >8-bit grayscale fidelity is mandatory and diagnostic features are handled externally. |
| IS31FL3728-QFLS4-TR | 18-channel, 8-bit PWM at 27 kHz, built-in auto-breathing, I²C + SPI interface, AEC-Q100 Grade 2, but max 25 mA/channel. | Higher channel count and dual-interface flexibility, but lower per-channel current limits performance in high-brightness automotive zones. | Choose IS31FL3728-QFLS4-TR when needing >16 channels or SPI fallback; use PCA9955TW/Q900,118 for 57 mA per channel in demanding lighting zones. |
Compared with TLC5940RTQR and IS31FL3728-QFLS4-TR, the PCA9955TW/Q900,118 uniquely combines AEC-Q100 compliance, 57 mA per channel, integrated group blink/dim, and real-time fault reporting-making it optimal for safety-critical automotive interior lighting where reliability and synchronized visual cues are essential.
Availability
PCA9955TW/Q900,118 is available at Aetrix Electronics and suitable for automotive interior lighting, amusement product displays, RGB status indicators, and keypad backlighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for PCA9955TW/Q900,118 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal IC design and automotive qualification.
The PCA9955TW/Q900,118 belongs to NXP's LED driver product line, engineered specifically for high-reliability, multi-color LED control in automotive and entertainment systems where synchronized blinking, thermal resilience, and I²C bus robustness are critical.
FAQ
What is the maximum LED supply voltage supported by PCA9955TW/Q900,118?
The PCA9955TW/Q900,118 LED driver outputs tolerate up to 40 V when in the OFF state. This allows direct connection to common 12 V, 24 V, or 36 V LED strings without external voltage translation, simplifying power architecture in automotive and industrial lighting designs that use PCA9955TW/Q900,118.
Does PCA9955TW/Q900,118 support hardware-based blinking like PCA9952TW/Q900,118?
No - PCA9955TW/Q900,118 does not include the active-low Output Enable (OE) pin found on PCA9952TW/Q900,118. Blinking and dimming are implemented exclusively via its dual PWM architecture (individual + group) controlled through the I²C interface. Hardware blink functionality is exclusive to the PCA9952 variant.
How many PCA9955TW/Q900,118 devices can share one I²C bus?
Up to 16 PCA9955TW/Q900,118 devices can operate on a single I²C bus, enabled by four hardware address pins (A0–A3) providing a 4-bit address space. Each device must have a unique combination of A0–A3 pulled HIGH/LOW; unused pins require external pull-up/down resistors per NXP AN10897 guidance.
What fault conditions does PCA9955TW/Q900,118 detect and report?
The PCA9955TW/Q900,118 detects and reports open-load, short-circuit, and overtemperature faults via dedicated error flag registers (EFLAG0/EFLAG1). These flags are readable over I²C, allowing host microcontrollers to implement closed-loop diagnostics and fail-safe responses without external sensors-critical for automotive-grade PCA9955TW/Q900,118 deployments.
Is PCA9955TW/Q900,118 pin-compatible with PCA9952TW/Q900,118?
No - PCA9955TW/Q900,118 and PCA9952TW/Q900,118 are not pin-compatible. Pin 5 is OE (input) on PCA9952 but A3 (address input) on PCA9955. Layouts designed for one cannot be reused for the other without modification. Both use HTSSOP28, but their pin functions differ at five locations (A3/OE, RESET, SCL, SDA, VDD).
PCA9955TW/Q900,118 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:
- Active
- Type:
- Linear
- Topology:
- -
- 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:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
PCA9955TW/Q900,118 FAQ
1.How can I place an order for PCA9955TW/Q900,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9955TW/Q900,118 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 PCA9955TW/Q900,118 reliable?
The price and inventory of PCA9955TW/Q900,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9955TW/Q900,118 is usually 5 days.
3.What payment methods are accepted for PCA9955TW/Q900,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9955TW/Q900,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9955TW/Q900,118?
PCA9955TW/Q900,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9955TW/Q900,118 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 PCA9955TW/Q900,118?
For technical support, including PCA9955TW/Q900,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9955TW/Q900,118 requirements.
6.How does Aetrix verify that PCA9955TW/Q900,118 is sourced from the original manufacturer or authorized distributors?
All PCA9955TW/Q900,118 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 PCA9955TW/Q900,118 meets industry standards.
7.What is the process for return or replacement of PCA9955TW/Q900,118?
All PCA9955TW/Q900,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9955TW/Q900,118, 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 PCA9955TW/Q900,118 part is unused and in its original packaging.
Return procedure for PCA9955TW/Q900,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9955TW/Q900,118 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
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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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