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NXP Semiconductors PCA9634PW/S910,118
- Part No.:
- PCA9634PW/S910,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9634PW/S910,118.pdf
- Description:
- IC LED DRVR PS I2C 25MA 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
PCA9634PW/S910,118 from NXP Semiconductors is an 8-bit Fast-mode Plus (Fm+) I²C-bus LED driver optimized for RGBA color mixing, featuring eight totem-pole or open-drain LED outputs (25 mA sink / 10 mA source at 5 V), individual 97 kHz PWM brightness control (256 steps), group dimming/blinking (190 Hz fixed or 24 Hz–10.73 s programmable), and 2.3 V–5.5 V operation. It enables synchronized LED control in compact displays and status indicators.
For engineers reviewing the PCA9634PW/S910,118 datasheet, PCA9634PW/S910,118 pinout, PCA9634PW/S910,118 application, or PCA9634PW/S910,118 equivalent, this device supports hardware- and software-controlled LED grouping via All Call/Sub Call addresses, asynchronous output enable (OE), and I²C-bus reset-critical for multi-device RGB lighting systems requiring precise timing, low-latency updates, and bus scalability up to 126 nodes.
Technical Context
The PCA9634PW/S910,118 integrates a 25 MHz internal oscillator (no external components required) and dual PWM architecture: per-channel 97 kHz individual brightness control with 0–99.6% duty cycle resolution, plus a separate group-level PWM path supporting either 190 Hz fixed-frequency dimming or programmable blinking (24 Hz to 10.73 s period). Its Fm+ interface operates up to 1 MHz with 30 mA SDA drive strength for high-capacitance buses.
Control logic includes volatile register mapping (MODE1/MODE2, PWM0–PWM7, GRPPWM/GRPFREQ, LEDOUT0/LEDOUT1), Auto-Increment addressing modes (AI[2:0]), and hardware address pins (A0–A6) enabling up to 126 devices on one bus. Output behavior is fully configurable per channel-off/on/individual PWM/group PWM-and OE pin allows hardware-synchronized blanking or external dimming independent of I²C traffic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Interface | Fm+ compatible, up to 1 MHz; supports 4000 pF bus capacitance with 30 mA SDA drive |
| LED Outputs | 8 channels; configurable as totem-pole (25 mA sink / 10 mA source @ 5 V) or open-drain (25 mA sink @ 5 V) |
| Individual PWM | 97 kHz fixed frequency; 256-step linear brightness control (0–99.6% duty cycle) |
| Group PWM | 190 Hz fixed dimming OR programmable blink (24 Hz to 10.73 s period); 256-step duty cycle control |
| Supply Range | 2.3 V to 5.5 V; inputs tolerant to 5.5 V; −40 °C to +85 °C operating temperature |
| Addressing | 7 hardware address pins (126 unique addresses); 1 All Call + 3 Sub Call software addresses |
| Reset & Control | Software Reset (SWRST) via I²C; active-low OE pin for hardware synchronization or external dimming |
Pinout & Package
TSSOP20 package (SOT360-1), 20-pin thin shrink small outline, 4.4 mm body width, lead pitch 0.65 mm, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A6 | Hardware address inputs | Set unique I²C slave address; 7 pins support up to 126 devices on same bus |
| SDA | I²C bidirectional data line | Open-drain I/O with 30 mA drive capability; supports Fm+ 1 MHz operation |
| SCL | I²C clock input | Input with noise filter; edge-rate controlled for EMI reduction |
| OE | Active-low output enable | Asynchronously disables all LED outputs; enables hardware blink/dim sync or external PWM control |
| LED0–LED7 | LED driver outputs | Configurable totem-pole or open-drain; each drives up to 25 mA directly at 5.5 V tolerance |
| VDD | Power supply | 2.3 V–5.5 V analog/digital supply; powers internal 25 MHz oscillator |
| VSS | Ground reference | Common return for all circuitry; must be connected for proper operation |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel brightness control | 256-step linear PWM at 97 kHz ensures flicker-free, high-resolution intensity tuning without visible stepping |
| Group-level dimming/blinking | Independent 256-step control over global brightness (190 Hz) or blink timing (24 Hz–10.73 s), decoupled from individual LED settings |
| Multi-device coordination | All Call and three Sub Call I²C addresses allow simultaneous command broadcast to defined LED groups-e.g., all reds or marquee segments-reducing bus overhead |
| Output configuration flexibility | Software-selectable totem-pole (bidirectional) or open-drain (current-sink only) mode per device, supporting direct LED drive or external high-current drivers |
| Robust bus integration | Fm+ 1 MHz interface with noise-filtered SDA/SCL, edge-rate-controlled outputs, hot-insertion support, and no power-up glitches |
Applications
| RGB Status Indicators | Keypad Backlighting |
|---|---|
Use Scenario: Multi-color status LEDs on industrial HMI panels requiring distinct visual states (e.g., green=ready, red=alarm, amber=warning). IC Role / Device Role / Timing Role: PCA9634PW/S910,118 acts as the dedicated RGBA LED controller, managing independent brightness and synchronized blink patterns across 8 channels using I²C commands. Use Value: Enables precise color mixing and consistent luminance grading across multiple units without MCU intervention-reducing firmware complexity and CPU load. |
Use Scenario: Backlighting for membrane keypads in handheld medical devices where uniform illumination and low standby current are critical. IC Role / Device Role / Timing Role: PCA9634PW/S910,118 provides adjustable backlight intensity and soft-on/off fade via group PWM, triggered by user input or ambient light sensor signals. Use Value: Delivers smooth brightness transitions and ultra-low quiescent current (<1 µA in sleep mode), extending battery life while maintaining tactile feedback visibility. |
| LCD Backlight Control | Marquee Display Effects |
Use Scenario: Edge-lit LCD backlights in portable test equipment requiring uniform white-light output with dynamic dimming. IC Role / Device Role / Timing Role: PCA9634PW/S910,118 drives parallel white LED strings via external MOSFETs (configured in open-drain mode), with group PWM setting overall brightness. Use Value: Eliminates need for discrete PWM generators and level shifters-simplifying layout and improving thermal performance through centralized current regulation. |
Use Scenario: Directional scrolling text or icon animations on consumer electronics front panels using discrete RGB LEDs. IC Role / Device Role / Timing Role: PCA9634PW/S910,118 executes coordinated chase patterns by assigning subsets of LEDs to Sub Call addresses and updating brightness registers in sequence. Use Value: Achieves deterministic, low-jitter animation timing using hardware-based Auto-Increment addressing-no frame-buffer memory or real-time OS required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59116IPWPR | 400 kHz standard I²C (not Fm+); no group blink frequency programming; 12-bit PWM resolution vs. 8-bit | Lacks programmable blink period; better suited for static dimming than animated effects | Select when higher grayscale depth is prioritized over bus speed and dynamic blink control |
| IS31FL3728-QFLS4-TR | 2 MHz I²C; integrated auto-breathing engine; no hardware address pins; 28-channel vs. 8-channel | Designed for larger LED arrays; requires different register mapping and lacks All Call/Sub Call grouping | Select for high-channel-count, space-constrained designs where advanced breathing effects outweigh bus scalability needs |
Compared with TLC59116IPWPR and IS31FL3728-QFLS4-TR, the PCA9634PW/S910,118 uniquely balances Fm+ bus speed, hardware-address scalability (126 devices), and dual-layer PWM control-making it optimal for multi-node, animation-rich RGBA systems where timing determinism and I²C efficiency are design-critical.
Availability
PCA9634PW/S910,118 is available at Aetrix Electronics and suitable for RGB status indicators, keypad backlights, LCD backlight control, and marquee display effects requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for PCA9634PW/S910,118 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 mixed-signal and interface ICs.
The PCA9634PW/S910,118 belongs to NXP's Fm+ I²C LED driver product line, engineered specifically for scalable, low-latency RGB/RGBA lighting control in resource-constrained embedded systems requiring precise timing and bus efficiency.
FAQ
What is the maximum I²C-bus speed supported by the PCA9634PW/S910,118?
The PCA9634PW/S910,118 supports Fast-mode Plus (Fm+) I²C operation up to 1 MHz, with enhanced SDA drive capability (30 mA) enabling reliable communication on buses with up to 4000 pF capacitance-significantly exceeding standard Fast-mode (400 kHz) limits. This allows faster LED state updates and reduced command latency in multi-device configurations.
Can the PCA9634PW/S910,118 drive LEDs directly without external transistors?
Yes, the PCA9634PW/S910,118 can drive LEDs directly: its totem-pole outputs deliver 25 mA sink and 10 mA source at 5 V, and open-drain outputs support 25 mA sink at 5.5 V tolerance. Direct drive is suitable for standard 20 mA LEDs; external drivers are needed only for higher-current or higher-voltage LED strings.
How does the PCA9634PW/S910,118 handle group blinking versus individual brightness control?
The PCA9634PW/S910,118 uses two independent PWM paths: individual 97 kHz PWM (PWM0–PWM7 registers) sets per-LED brightness, while group blinking/dimming (GRPPWM/GRPFREQ registers) applies a second modulation layer. When both are enabled (LDRx = 11), their duty cycles multiply-enabling synchronized blink effects across all LEDs while preserving relative color balance.
What is the function of the OE pin on the PCA9634PW/S910,118?
The active-low OE (Output Enable) pin on the PCA9634PW/S910,118 provides hardware-level control over all LED outputs: pulling OE HIGH places outputs in a defined state (programmed via MODE2's OUTNE bits), enabling synchronous blanking or external PWM dimming; pulling OE LOW restores full I²C-controlled operation. It supports glitch-free startup and system-level power sequencing.
Does the PCA9634PW/S910,118 require an external crystal or RC network for timing?
No, the PCA9634PW/S910,118 contains a fully integrated 25 MHz oscillator requiring no external components. This oscillator feeds both the internal logic and all PWM generators (97 kHz individual, 190 Hz or programmable group), ensuring stable, jitter-free LED timing across voltage and temperature ranges without added BOM cost or layout area.
PCA9634PW/S910,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Power Switch
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 2.3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5.5V
- Current - Output / Channel:
- 25mA
- Frequency:
- 25MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
PCA9634PW/S910,118 FAQ
1.How can I place an order for PCA9634PW/S910,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9634PW/S910,118 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 PCA9634PW/S910,118 reliable?
The price and inventory of PCA9634PW/S910,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9634PW/S910,118 is usually 5 days.
3.What payment methods are accepted for PCA9634PW/S910,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9634PW/S910,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9634PW/S910,118?
PCA9634PW/S910,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9634PW/S910,118 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 PCA9634PW/S910,118?
For technical support, including PCA9634PW/S910,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9634PW/S910,118 requirements.
6.How does Aetrix verify that PCA9634PW/S910,118 is sourced from the original manufacturer or authorized distributors?
All PCA9634PW/S910,118 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 PCA9634PW/S910,118 meets industry standards.
7.What is the process for return or replacement of PCA9634PW/S910,118?
All PCA9634PW/S910,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9634PW/S910,118, 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 PCA9634PW/S910,118 part is unused and in its original packaging.
Return procedure for PCA9634PW/S910,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9634PW/S910,118 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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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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