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NXP Semiconductors PCU9656B,118
- Part No.:
- PCU9656B,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 48-LQFP
- Datasheet:
-
PCU9656B,118.pdf
- Description:
- IC LED DRVR LIN PWM 100MA 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,986
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Product details
Overview
PCU9656B,118 from NXP Semiconductors is a 24-channel UFm I²C-bus LED driver IC optimized for RGBA LED voltage-switch dimming and synchronized blinking. It delivers 100 mA per open-drain output (40 V tolerant), features independent 8-bit PWM at 97 kHz (256 brightness steps), group PWM at 190 Hz or programmable 24 Hz–10.73 s blink frequency, and operates from 2.3 V to 5.5 V supply. It enables marquee chasing effects in keypad backlights and status displays.
For engineers reviewing the PCU9656B,118 datasheet, PCU9656B,118 pinout, PCU9656B,118 application, or PCU9656B,118 equivalent, key selection criteria include its 5 MHz UFm I²C interface, hardware address scalability (64 devices), active-low OE for hardware blink synchronization, Chase Byte pattern control, and LQFP48 package compatibility with high-density LED arrays.
Technical Context
The PCU9656B,118 integrates a 25 MHz internal oscillator (no external components required) and supports three distinct output control modes per channel: OFF, ON, individual PWM, or combined individual + group PWM. Its register architecture includes 24 dedicated PWM registers (02h–19h), GRPPWM/GRPFREQ for global dimming/blinking, and a CHASE register enabling predefined ON/OFF patterns via index-based lookup.
It implements four software-programmable I²C addresses (one All Call + three Sub Call), six hardware address pins (A0–A5), and supports Auto-Increment addressing across multiple register banks. Output state updates are configurable to occur on STOP command or Acknowledge (bit 9), ensuring deterministic timing for synchronized multi-device LED control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 24 independent open-drain outputs, each sinking up to 100 mA with 40 V off-state tolerance |
| Individual PWM | 8-bit resolution (256 steps), 97 kHz typical frequency, 0–99.6% duty cycle for precise per-LED brightness |
| Group PWM | 8-bit resolution, 190 Hz default dimming frequency or programmable 24 Hz to 10.73 s blink period |
| I²C Interface | Ultra Fast-mode (UFm), 5 MHz unidirectional write-only bus; no read capability |
| Supply Voltage | 2.3 V to 5.5 V VDD; non-LED pins tolerate up to 5.5 V |
| Operating Temp | −40 °C to +85 °C industrial temperature range |
| Package | LQFP48 (7 mm × 7 mm × 1.4 mm), lead-free and RoHS compliant |
Pinout & Package
LQFP48 package with exposed thermal pad (SOT313-2); 48-pin quad flat design optimized for thermal dissipation in high-current LED driving applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS (Pins 1,6,7,12,16,21,25,30,31,36,37,45,48) | Power ground | Multiple ground connections ensure low-impedance return paths for 24 high-current LED sinks |
| LED0–LED23 (Pins 2–5,8–11,17–20,26–29,32–35,41–44) | Open-drain LED driver outputs | Each drives one LED cathode; supports 0–100 mA sink current and 40 V LED supply rail |
| A0–A5 (Pins 46,47,13,14,15,22) | Hardware I²C address inputs | Set unique 6-bit slave address; enable up to 63 individually addressable devices on same bus |
| OE (Pin 24) | Active-low output enable | Hardware-controlled global blink/dim; overrides all PWM settings when asserted |
| USCL / USDA (Pins 38,39) | UFm I²C clock/data inputs | 5 MHz compatible; include noise filtering for robust operation in noisy environments |
| VDD (Pin 40) | Power supply input | 2.3–5.5 V logic and internal oscillator supply; decoupling required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Chase Byte pattern control | Reduces I²C traffic for marquee effects by indexing pre-defined LED ON/OFF sequences (e.g., LTR_0_ON to LTR_23_ON) |
| Software Reset (SWRST) | Resets all registers to POR defaults via reserved I²C address (00000110), eliminating need for power cycle |
| Output update timing control | Selectable change-on-STOP or change-on-Acknowledge ensures synchronized multi-device LED updates |
| Glitch-free power-up | Internal power-on reset and latch-up immunity (>100 mA per JEDEC JESD78) prevent unintended LED turn-on |
| Hot insertion support | ESD protection >2000 V HBM and >1000 V CDM enables safe board-level integration without system shutdown |
Applications
| Keypad Backlighting | RGB Status Indicators |
|---|---|
Use Scenario: Backlighting alphanumeric keypads in cellular phones and handheld devices with dynamic intensity and color sequencing. IC Role / Device Role / Timing Role: 24-channel LED driver providing independent brightness control per key and synchronized chase patterns via CHASE register. Use Value: Enables low-power, visually distinct key feedback using only two I²C wires and minimal firmware overhead. |
Use Scenario: Real-time system status indication using RGB/RGBA LEDs on industrial HMIs and network equipment front panels. IC Role / Device Role / Timing Role: Group PWM dimming (190 Hz) and blinking (programmable 24 Hz–10.73 s) for attention-grabbing alerts without MCU intervention. Use Value: Hardware-based blink timing eliminates CPU polling, reduces firmware complexity, and ensures consistent visual response. |
| LED Display Modules | LCD Backlight Control |
Use Scenario: Driving segmented or dot-matrix LED displays requiring uniform brightness and coordinated animation effects. IC Role / Device Role / Timing Role: Simultaneous update of all 24 outputs using STOP-triggered writes and All Call addressing for frame-synchronized rendering. Use Value: Eliminates visible scan-line artifacts during animation by guaranteeing atomic output state changes across all channels. |
Use Scenario: Controlling edge-lit or direct-lit LCD backlights in portable medical devices and test equipment. IC Role / Device Role / Timing Role: High-current (100 mA/channel), 40 V-tolerant outputs drive series-connected white LEDs with precise dimming resolution. Use Value: Supports wide-input LED supplies while maintaining 8-bit linear brightness control for smooth luminance transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5940RTQR | 16-channel, 12-bit PWM, 30 MHz SPI interface; no group blink or Chase Byte; requires external oscillator | Higher resolution but lower channel count; lacks hardware blink sync and marquee pattern acceleration | Choose for precision grayscale control in smaller LED arrays where SPI bandwidth exceeds I²C needs |
| PCA9685PW | 16-channel, 12-bit PWM, 1 MHz Fast-mode Plus I²C; 25 mA per channel; no group blink frequency programming | Lower current rating and fixed 1.56 kHz PWM; supports read-back but no Chase Byte or OE-driven hardware blink | Choose for cost-sensitive, lower-power LED systems requiring register read verification and simpler I²C timing |
Compared with TLC5940RTQR and PCA9685PW, the PCU9656B,118 uniquely combines 24 high-current channels, 5 MHz UFm I²C, programmable group blink timing, and hardware-accelerated marquee patterns-making it optimal for dense, animated status displays requiring minimal MCU overhead.
Availability
PCU9656B,118 is available at Aetrix Electronics and suitable for keypad backlights, RGB status indicators, LED display modules, and LCD backlight control requiring stable component supply and long-term industrial availability.
Supply support for PCU9656B,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.
The PCU9656B,118 belongs to NXP's Ultra Fast-mode LED driver family, designed specifically for high-density, animated LED interfaces requiring hardware-accelerated pattern control and robust multi-device I²C scalability.
FAQ
What is the maximum number of PCU9656B,118 devices supported on a single UFm I²C bus?
The PCU9656B,118 supports up to 63 individually addressable devices using its six hardware address pins (A0–A5). One address is reserved for Software Reset, and the default LED All Call address (E0h) must not be reused as a regular slave address to avoid bus contention. This enables scalable LED array expansion without I²C bus segmentation.
Does the PCU9656B,118 support reading back register values over the I²C bus?
No, the PCU9656B,118 implements a write-only UFm I²C interface. All register writes-including PWM0–PWM23, GRPPWM, GRPFREQ, and CHASE-are unidirectional. The device does not support read operations, so firmware must maintain shadow copies of register states for verification or debugging purposes.
How does the Chase Byte feature reduce I²C traffic for marquee effects?
The PCU9656B,118's CHASE register (1Ch) acts as an index into a built-in table of 55 predefined LED ON/OFF patterns (e.g., LTR_0_ON through LTR_23_ON). Writing a single byte (e.g., 07h) activates the corresponding pattern-eliminating the need to send 24 separate PWM or LEDOUT commands per frame in marquee animations.
What is the function of the active-low OE pin on the PCU9656B,118?
The OE (Output Enable) pin on the PCU9656B,118 provides hardware-level global control: when pulled LOW, it forces all 24 LED outputs OFF regardless of PWM or group settings. When toggled externally at audio or visual frequencies, it enables synchronized blinking across multiple PCU9656B,118 devices without I²C bus traffic or MCU intervention.
Can the PCU9656B,118 drive LEDs with supply voltages above 5.5 V?
Yes-the PCU9656B,118's 24 open-drain LED outputs tolerate up to 40 V in the OFF state, allowing connection to LED strings powered by higher-voltage rails (e.g., 12 V, 24 V, or 36 V). The VDD supply remains limited to 2.3–5.5 V, but the LED anodes may be tied directly to these higher external supplies without damage.
PCU9656B,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 24
- Voltage - Supply (Min):
- 2.3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 100mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
PCU9656B,118 FAQ
1.How can I place an order for PCU9656B,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCU9656B,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 PCU9656B,118 reliable?
The price and inventory of PCU9656B,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCU9656B,118 is usually 5 days.
3.What payment methods are accepted for PCU9656B,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCU9656B,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCU9656B,118?
PCU9656B,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCU9656B,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 PCU9656B,118?
For technical support, including PCU9656B,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCU9656B,118 requirements.
6.How does Aetrix verify that PCU9656B,118 is sourced from the original manufacturer or authorized distributors?
All PCU9656B,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 PCU9656B,118 meets industry standards.
7.What is the process for return or replacement of PCU9656B,118?
All PCU9656B,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCU9656B,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 PCU9656B,118 part is unused and in its original packaging.
Return procedure for PCU9656B,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCU9656B,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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