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NXP Semiconductors PCA9635PW,112
- Part No.:
- PCA9635PW,112
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9635PW,112.pdf
- Description:
- IC LED DRVR LIN PWM 25MA 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,935
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Product details
Overview
PCA9635PW,112 from NXP Semiconductors is a 16-bit Fast-mode Plus (Fm+) I²C-bus LED driver optimized for RGBA color mixing, featuring individual 8-bit PWM (97 kHz, 0–99.6% duty) per channel, group PWM (190 Hz fixed or 24 Hz–10.73 s programmable), totem-pole/open-drain output configuration (25 mA sink/10 mA source at 5 V), and 2.3–5.5 V operation. It enables precise brightness control in LED status indicators and keypad backlights.
For engineers reviewing the PCA9635PW,112 datasheet, PCA9635PW,112 pinout, PCA9635PW,112 application, or PCA9635PW,112 equivalent, key selection considerations include I²C-bus address scalability (up to 126 devices), software-reset capability, OE-driven hardware dimming/blinking synchronization, and TSSOP28 package compatibility with high-density PCB layouts.
Technical Context
The PCA9635PW,112 implements dual-layer PWM architecture: sixteen independent 97 kHz, 256-step brightness controllers (PWM0–PWM15) and one shared group controller (GRPPWM/GRPFREQ) supporting either 190 Hz 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, enabling robust communication on buses up to 4000 pF.
Output behavior is fully configurable via LEDOUT registers (LDRx = 00/01/10/11), allowing per-channel selection of OFF, ON, individual PWM, or combined individual + group PWM modes. The active-low OE pin provides asynchronous hardware override, setting outputs to logic HIGH, logic LOW, or high-impedance states independent of I²C activity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Bus Speed | Up to 1 MHz (Fast-mode Plus), enabling faster LED updates and higher node density vs. standard I²C. |
| LED Channels | 16 independent outputs, each with dedicated 8-bit brightness register (0–255) and mode control. |
| Individual PWM | 97 kHz fixed frequency, 256 linear steps (0%–99.6% duty), enabling flicker-free brightness control. |
| Group PWM | 190 Hz fixed dimming or programmable blink (24 Hz–10.73 s period), synchronized across all 16 channels. |
| Output Drive | Totem-pole: 25 mA sink / 10 mA source at 5 V; open-drain: 25 mA sink; both 5.5 V tolerant. |
| Supply Range | 2.3 V to 5.5 V operation, supporting single-supply designs across 3.3 V and 5 V systems. |
| Addressing | 7 hardware address pins (126 unique addresses); 1 All Call + 3 Sub Call software addresses for grouped control. |
Pinout & Package
TSSOP28 package (SOT361-1), 4.4 mm body width, 0.65 mm pitch, surface-mount compatible with automated assembly and thermal performance suitable for LED driver applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A6 | Hardware I²C address inputs | Set unique slave address; 7 pins enable up to 126 devices on same bus (A6–A0 = MSB–LSB). |
| SDA | I²C serial data line (bidirectional) | Open-drain I/O with 30 mA drive strength; supports high-capacitance Fm+ buses (≤4000 pF). |
| SCL | I²C serial clock input | Input with noise filter; edge-rate controlled for EMI reduction in noisy environments. |
| OE | Active-low output enable | Asynchronous hardware override: disables all LED outputs to defined state (HIGH/LOW/HI-Z) regardless of register settings. |
| LED0–LED15 | 16 LED driver outputs | Configurable as totem-pole or open-drain; each supports direct connection to LEDs ≤25 mA / 5.5 V. |
| VDD, VSS | Power supply and ground | 2.3–5.5 V operation; 5.5 V tolerant inputs allow mixed-voltage system interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Software Reset (SWRST) | Full register reset via I²C address 0x06 - identical to power-on reset, restoring default outputs (HIGH) and configuration. |
| Group Addressing | Four programmable I²C addresses (1 All Call + 3 Sub Call) enable simultaneous control of LED subsets (e.g., all reds, marquee groups) without repeated commands. |
| Output State Timing | Configurable update trigger: outputs change on STOP (default) or ACK, enabling synchronized multi-device updates across I²C transactions. |
| Noise Immunity | Integrated noise filters on SDA/SCL inputs and edge-rate control on outputs reduce susceptibility to EMI in industrial and portable environments. |
| Hot Insertion Support | Internal power-on reset and glitch-free startup ensure safe operation during live bus insertion without disrupting other devices. |
Applications
| RGB LED Status Indicators | Keypad Backlight Control |
|---|---|
Use Scenario: Multi-color status feedback on industrial HMI panels requiring distinct visual states (e.g., green=ready, red=alarm, amber=warning). IC Role / Device Role / Timing Role: PCA9635PW,112 drives 16 discrete RGB LEDs with independent 97 kHz PWM per channel to eliminate visible flicker and enable smooth color transitions. Use Value: Precise 256-step brightness control per LED allows calibrated luminance matching across colors, critical for consistent human-perceived status signaling. |
Use Scenario: Uniform backlighting for membrane keypads in handheld medical devices where low-power, compact design and variable intensity are required. IC Role / Device Role / Timing Role: PCA9635PW,112 delivers synchronized dimming across all keys using group PWM (190 Hz), while individual PWM adjusts corner/border brightness for even illumination. Use Value: Single-chip control of up to 16 keys eliminates discrete transistor arrays, reducing BOM count and PCB area by >40% versus discrete solutions. |
| LED Display Segments | LCD Backlight Driver |
Use Scenario: 7-segment or custom alphanumeric LED displays in test equipment requiring high-contrast, low-glare digits under varying ambient light. IC Role / Device Role / Timing Role: PCA9635PW,112 configures LED outputs as totem-pole (25 mA sink/10 mA source) to drive common-anode segments directly without external transistors. Use Value: Hardware OE pin enables rapid global on/off strobing for multiplexed display refresh, reducing MCU overhead and improving effective brightness. |
Use Scenario: Edge-lit LCD backlight for portable instrumentation with dynamic brightness scaling based on battery voltage and ambient light sensor input. IC Role / Device Role / Timing Role: PCA9635PW,112 uses group PWM (programmable 24 Hz–10.73 s) to implement slow fade-in/fade-out backlight transitions without MCU intervention. Use Value: Software-programmable blink period eliminates need for external timing components, simplifying design and improving long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5940IPWP | 16-channel, 12-bit PWM (4096 steps), 30 MHz internal clock, no group PWM, requires external Rref for current setting. | Higher resolution but lacks synchronized group dimming/blinking; better for precision grayscale, less suited for coordinated UI effects. | Choose TLC5940IPWP when 12-bit grayscale fidelity is critical and group-level timing control is unnecessary. |
| IS31FL3728-QFLS4-TR | 18-channel, 8-bit PWM (97.6 kHz), integrated current regulation (max 40 mA), I²C + SPI interface, built-in auto-breathing engine. | Higher current drive and native breathing effect support; no hardware OE pin or Fm+ bus speed; different register map. | Choose IS31FL3728-QFLS4-TR for higher-current LEDs or pre-programmed breathing effects, accepting SPI/I²C dual-interface complexity. |
Compared with TLC5940IPWP and IS31FL3728-QFLS4-TR, the PCA9635PW,112 uniquely balances scalable I²C addressing, hardware-synchronized group control via OE, and Fm+ bus robustness - making it optimal for multi-device UI lighting where coordinated timing and layout simplicity are prioritized over ultra-high PWM resolution or integrated current regulation.
Availability
PCA9635PW,112 is available at Aetrix Electronics and suitable for RGB LED status indicators, keypad backlights, LED display segments, and LCD backlighting requiring stable component supply, long-term lifecycle support, and automotive-grade traceability (Q900 variant available).
Supply support for PCA9635PW,112 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 interface, power, and mixed-signal ICs.
The PCA9635PW,112 belongs to NXP's Fm+ I²C LED driver family, designed specifically for high-density, multi-node LED control in space-constrained user interfaces where synchronized dimming, low EMI, and software-configurable group addressing are essential.
FAQ
What is the maximum I²C-bus capacitance supported by the PCA9635PW,112?
The PCA9635PW,112 supports up to 4000 pF bus capacitance due to its Fast-mode Plus (Fm+) interface with 30 mA SDA drive strength. This enables reliable communication across longer traces or with higher node counts than standard I²C, and is confirmed in the Rev. 7.1 datasheet Section 2. This capability ensures robust operation in complex PCB layouts where multiple PCA9635PW,112 devices share a single bus.
Can the PCA9635PW,112 drive LEDs directly without external transistors?
Yes, the PCA9635PW,112 can drive LEDs directly: its totem-pole outputs deliver 25 mA sink and 10 mA source at 5 V, and open-drain mode supports 25 mA sink with 5.5 V tolerance. Direct drive is valid for LEDs rated ≤25 mA and ≤5.5 V forward voltage, as specified in the General Description and Pin Description sections of the PCA9635PW,112 datasheet.
How does the Output Enable (OE) pin function in the PCA9635PW,112?
The active-low OE pin on the PCA9635PW,112 provides hardware-level override of all 16 LED outputs. When OE is LOW, outputs follow LEDOUT register settings; when OE is HIGH, outputs enter a programmable state (logic HIGH, logic LOW, or high-impedance) defined by MODE2 register bits OUTNE[1:0]. This enables synchronized blinking/dimming across multiple PCA9635PW,112 devices using an external clock signal.
What is the purpose of the GRPFREQ register in the PCA9635PW,112?
The GRPFREQ register (address 0x13) in the PCA9635PW,112 sets the blinking period for group-level PWM when the DMBLNK bit (MODE2) is set to 1. It provides 256 linear steps mapping to periods from 41 ms (24 Hz) to 10.73 seconds. This register has no effect when DMBLNK = 0 (group dimming mode), where GRPPWM alone controls 190 Hz brightness scaling.
Does the PCA9635PW,112 support hot insertion into a live I²C bus?
Yes, the PCA9635PW,112 supports hot insertion, as explicitly stated in Section 2 (Features) of the datasheet. Its internal power-on reset, glitch-free startup, and noise-filtered SDA/SCL inputs prevent bus contention or spurious outputs during live connection - a requirement validated for use in field-upgradable modules and modular industrial systems where the PCA9635PW,112 may be added without powering down the host system.
PCA9635PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 2.3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5.5V
- Current - Output / Channel:
- 25mA
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
PCA9635PW,112 FAQ
1.How can I place an order for PCA9635PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9635PW,112 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 PCA9635PW,112 reliable?
The price and inventory of PCA9635PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9635PW,112 is usually 5 days.
3.What payment methods are accepted for PCA9635PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9635PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9635PW,112?
PCA9635PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9635PW,112 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 PCA9635PW,112?
For technical support, including PCA9635PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9635PW,112 requirements.
6.How does Aetrix verify that PCA9635PW,112 is sourced from the original manufacturer or authorized distributors?
All PCA9635PW,112 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 PCA9635PW,112 meets industry standards.
7.What is the process for return or replacement of PCA9635PW,112?
All PCA9635PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9635PW,112, 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 PCA9635PW,112 part is unused and in its original packaging.
Return procedure for PCA9635PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9635PW,112 Tags
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