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NXP Semiconductors PCA9634PW/S911,118
- Part No.:
- PCA9634PW/S911,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9634PW/S911,118.pdf
- Description:
- IC LED DRVR PS I2C 25MA 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,843
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Product details
Overview
PCA9634PW/S911,118 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 per channel (256-step brightness), and group PWM/blinking (190 Hz fixed or 24 Hz–10.73 s programmable). It operates from 2.3 V to 5.5 V and supports up to 126 devices on one bus via seven hardware address pins.
For engineers reviewing the PCA9634PW/S911,118 datasheet, PCA9634PW/S911,118 pinout, PCA9634PW/S911,118 application, or PCA9634PW/S911,118 equivalent, this device delivers synchronized multi-LED control with software-configurable group addressing (All Call/Sub Call), hardware OE-driven dimming/blanking, and I²C-bus reset-critical for RGB status indicators, keypad backlights, and compact display systems requiring precise, low-overhead LED management.
Technical Context
The PCA9634PW/S911,118 integrates a 25 MHz internal oscillator (no external components required) and implements dual-layer PWM architecture: per-channel 97 kHz individual brightness control (0–99.6% duty cycle) combined with a separately programmable group-level PWM (190 Hz fixed or 24 Hz–10.73 s variable frequency) for global dimming or blinking. Its Fm+ interface supports up to 1 MHz clock rate and 30 mA SDA drive strength for high-capacitance buses.
Output behavior is fully configurable via MODE1/MODE2 registers: LEDOUTx selects per-output state (off/on/individual/group), OUTDRV sets totem-pole (default) or open-drain mode, and DMBLNK toggles GRPPWM function between dimming and blinking. The active-low OE pin enables hardware-synchronized blanking or external PWM dimming independent of I²C traffic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Interface | Fm+ compliant: 1 MHz max clock, 30 mA SDA drive, 4000 pF bus capacitance support |
| LED Outputs | 8 channels; 25 mA sink / 10 mA source (totem-pole, 5 V); 5.5 V tolerant |
| Individual PWM | 97 kHz fixed frequency; 256-step linear duty cycle (0–99.6%) per LED |
| Group PWM | 190 Hz fixed or 24 Hz–10.73 s programmable frequency; 256-step duty cycle (0–99.6%) |
| Supply Range | 2.3 V to 5.5 V; internal 25 MHz oscillator eliminates external crystal |
| Addressing | 7 hardware address pins (126 devices); 4 software-programmable I²C addresses (1 All Call + 3 Sub Call) |
| Operating Temp | −40 °C to +85 °C; ESD rated >2000 V HBM, >1000 V CDM |
Pinout & Package
TSSOP20 package (SOT360-1), 4.4 mm body width, 0.65 mm pitch, thermally enhanced plastic thin shrink small outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A6 | Hardware address inputs | Set unique I²C slave address; 7 pins enable up to 126 devices on same bus |
| SDA | I²C serial data line (bidirectional) | Fm+ compliant with 30 mA drive; supports high-capacitance bus operation |
| SCL | I²C serial clock input | Accepts up to 1 MHz clock; includes noise filtering for robust timing |
| 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 as totem-pole (25 mA sink/10 mA source) or open-drain (25 mA sink) |
| VDD | Power supply | 2.3 V–5.5 V operation; powers internal oscillator and logic |
| VSS | Ground reference | Must be connected to system ground; HVQFN variant requires exposed pad soldering |
Key Features
| Feature | Design Value |
|---|---|
| Software Reset (SWRST) | Full register reset via I²C-bus command (06h), identical to Power-On Reset-no hardware reset pin needed |
| Output State Update Timing | Configurable to change on STOP (default) or ACK command-enables atomic multi-device updates |
| Group Addressing Flexibility | All Call (E0h) and three Sub Call addresses (E2h/E4h/E8h) allow simultaneous control of arbitrary LED subsets |
| No Glitch on Power-Up | Internal POR ensures all outputs default HIGH (LED off) before registers initialize-prevents flash-on at startup |
| Hot Insertion Support | IO pins tolerate 5.5 V with no damage during live board insertion-safe for modular or field-replaceable designs |
Applications
| RGB Status Indicators | Keypad Backlight Control |
|---|---|
Use Scenario: Multi-color status LEDs on industrial HMIs or network equipment front panels requiring smooth color transitions and uniform dimming. IC Role / Device Role / Timing Role: LED driver with per-channel 97 kHz PWM and synchronized group dimming to eliminate visible flicker across red/green/blue elements. Use Value: Enables precise RGBA mixing using only two PWM layers-no external MCU timing overhead or additional DACs required. |
Use Scenario: Backlighting for membrane keypads in handheld medical or consumer devices where space and power are constrained. IC Role / Device Role / Timing Role: Compact 8-output driver managing discrete white LEDs or RGB segments with hardware OE blanking for low-power sleep modes. Use Value: Reduces BOM count by integrating current drivers, oscillator, and I²C address logic-eliminates discrete transistors and timing resistors. |
| LCD Backlight Dimming | Marquee Chasing Effects |
Use Scenario: Edge-lit LCD backlight in portable instrumentation requiring smooth 0–100% dimming without audible coil whine. IC Role / Device Role / Timing Role: Group PWM controller (190 Hz fixed) driving multiple parallel LED strings with synchronized brightness scaling. Use Value: Avoids low-frequency PWM artifacts by using 190 Hz group dimming-compatible with human eye persistence and camera auto-exposure. |
Use Scenario: Sequential LED activation in signage or UI feedback (e.g., "power on" sweep) using minimal I²C commands. IC Role / Device Role / Timing Role: Sub Call addressing allows grouping LEDs by physical position (e.g., top row = Sub Call 1, bottom row = Sub Call 2). Use Value: Achieves marquee effect with single write to LEDOUT registers across groups-no per-LED polling or sequential writes needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59116IPWPR | 16-channel, 12-bit PWM (4096 steps); 1.2 MHz I²C; no group blinking; open-drain only | Better resolution for analog-like dimming; lacks programmable group blink period and OE pin functionality | Select when higher grayscale depth is critical and group blink timing control is unnecessary |
| IS31FL3728-QFLS4-TR | 28-channel, 8-bit PWM; 1.2 MHz I²C; integrated current regulation; no hardware OE pin | Higher channel count and built-in current matching; no direct hardware blanking-requires SW-controlled register writes | Select for dense LED arrays (>16 channels) where thermal management and channel uniformity outweigh need for OE sync |
Compared with TLC59116IPWPR and IS31FL3728-QFLS4-TR, the PCA9634PW/S911,118 uniquely combines hardware OE synchronization, programmable group blink timing (24 Hz–10.73 s), and dual-mode output drivers-making it optimal for systems requiring deterministic blanking, low-latency group effects, and flexible LED interfacing without added discretes.
Availability
PCA9634PW/S911,118 is available at Aetrix Electronics and suitable for RGB status indicators, keypad backlights, and LCD backlight dimming requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for PCA9634PW/S911,118 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 embedded control.
The PCA9634PW/S911,118 belongs to NXP's Fm+ I²C LED driver family, engineered specifically for space-constrained, low-software-overhead LED control in consumer electronics and human-machine interfaces-prioritizing bus efficiency, thermal resilience, and seamless integration with microcontroller-based systems.
FAQ
What is the default output configuration of PCA9634PW/S911,118 at power-up?
At power-up, PCA9634PW/S911,118 initializes all LED outputs to HIGH (LED off), sets MODE1.ALLCALL = 1 (enabling All Call address E0h), configures outputs as totem-pole (MODE2.OUTDRV = 1), and enables group dimming (MODE2.DMBLNK = 0). The internal 25 MHz oscillator starts within 500 µs, and all registers assume their documented default values-ensuring glitch-free startup without external intervention.
Can PCA9634PW/S911,118 drive LEDs directly without external components?
Yes, PCA9634PW/S911,118 can drive standard LEDs directly: its totem-pole outputs deliver 25 mA sink / 10 mA source at 5 V, and outputs are 5.5 V tolerant. For LEDs with integrated Zener protection, open-drain mode (configured via MODE2.OUTDRV = 0) must be used to prevent IC overheating-verified in NXP's application guidance for transient-sensitive LEDs.
How does the OE pin interact with internal group blinking (DMBLNK = 1)?
Using the OE pin for external PWM while DMBLNK = 1 in PCA9634PW/S911,118 results in undefined LED behavior per NXP's datasheet warning. The OE signal overrides internal PWM states asynchronously, causing unpredictable timing conflicts. For synchronized blinking, use only the internal GRPPWM/GRPFREQ registers; reserve OE for full blanking or dimming when DMBLNK = 0.
What is the maximum number of PCA9634PW/S911,118 devices supported on a single I²C bus?
PCA9634PW/S911,118 supports up to 126 devices on one I²C bus using its seven hardware address pins (A0–A6). Two addresses (Software Reset 06h and All Call E0h) are reserved and unavailable for individual addressing, leaving 126 usable combinations-sufficient for large-scale LED arrays in signage or industrial panels without bus repeaters.
Does PCA9634PW/S911,118 require external pull-up resistors on SDA/SCL lines?
Yes, PCA9634PW/S911,118 requires external pull-up resistors on both SDA and SCL lines. The device includes no internal pull-ups on these lines, and the datasheet specifies that external resistors must be used to ensure proper I²C bus signaling-typical values range from 1.8 kΩ to 10 kΩ depending on bus capacitance and speed requirements.
PCA9634PW/S911,118 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/S911,118 FAQ
1.How can I place an order for PCA9634PW/S911,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9634PW/S911,118 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/S911,118 reliable?
The price and inventory of PCA9634PW/S911,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9634PW/S911,118 is usually 5 days.
3.What payment methods are accepted for PCA9634PW/S911,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9634PW/S911,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9634PW/S911,118?
PCA9634PW/S911,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9634PW/S911,118 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/S911,118?
For technical support, including PCA9634PW/S911,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9634PW/S911,118 requirements.
6.How does Aetrix verify that PCA9634PW/S911,118 is sourced from the original manufacturer or authorized distributors?
All PCA9634PW/S911,118 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/S911,118 meets industry standards.
7.What is the process for return or replacement of PCA9634PW/S911,118?
All PCA9634PW/S911,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9634PW/S911,118, 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/S911,118 part is unused and in its original packaging.
Return procedure for PCA9634PW/S911,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9634PW/S911,118 Tags
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