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NXP Semiconductors PCA9635PW/S911,118
- Part No.:
- PCA9635PW/S911,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9635PW/S911,118.pdf
- Description:
- IC LED DRVR LIN PWM 25MA 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,254
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Product details
Overview
PCA9635PW/S911,118 from NXP Semiconductors is a 16-bit Fast-mode Plus (Fm+) I²C-bus LED driver optimized for RGBA color mixing, featuring individual 97 kHz PWM per channel (256-step brightness), group 190 Hz dimming/blinking (256-step), totem-pole or open-drain output configuration (25 mA sink/10 mA source at 5 V), and 2.3 V–5.5 V operation. It enables synchronized LED control in compact displays and status indicators.
For engineers reviewing the PCA9635PW/S911,118 datasheet, PCA9635PW/S911,118 pinout, PCA9635PW/S911,118 application, or PCA9635PW/S911,118 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated TSSOP28 pin functions, confirmed alternative drivers with functional differences, and supply-ready procurement details - all grounded in NXP's Rev. 7.1 product data sheet.
Technical Context
The PCA9635PW/S911,118 integrates a 25 MHz internal oscillator (no external components required) and supports Fm+ I²C up to 1 MHz with 30 mA SDA drive strength for high-capacitance buses. Its dual-PWM architecture separates per-LED 97 kHz control (PWM0–PWM15 registers) from group-level 190 Hz dimming or programmable blinking (24 Hz to 10.73 s via GRPFREQ).
Hardware address pins (A0–A6) enable up to 126 devices on one bus; software-configurable LED Group Call (E0h) and three Sub Call addresses (E2h/E4h/E8h) allow hierarchical control - e.g., simultaneous red-LED activation or marquee effects - without increasing I²C command overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Interface | Fm+ compatible, 1 MHz max clock; enables dense bus loading (up to 4000 pF) and faster register writes vs standard I²C. |
| LED Channels | 16 independent outputs; each configurable as off/on/PWM-controlled or combined individual + group PWM. |
| Individual PWM | 97 kHz fixed frequency, 256-step (8-bit) linear duty cycle (0–99.6%); ensures flicker-free brightness control for human-visible LEDs. |
| Group Control | 256-step global dimming (190 Hz) or blinking (24 Hz to 10.73 s period); enables uniform UI feedback across multi-LED arrays. |
| Output Drive | Totem-pole mode: 25 mA sink / 10 mA source at 5 V; open-drain mode: 25 mA sink only; selectable per device via MODE2 register. |
| Supply Range | 2.3 V to 5.5 V; supports direct integration with 3.3 V microcontrollers and 5 V LED strings without level shifters. |
| Package | TSSOP28 (SOT361-1), 4.4 mm body width; surface-mount compatible with standard reflow profiles and IPC-compliant layout rules. |
Pinout & Package
TSSOP28 package (SOT361-1), 4.4 mm body width, 0.65 mm pitch; RoHS-compliant, lead-free finish; thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A6 | Hardware I²C address inputs | Set unique slave address (7-bit); enable up to 126 devices on same bus; require external pull-up/down resistors. |
| SDA | I²C bidirectional data line | Open-drain I/O with 30 mA drive strength; supports high-capacitance buses without external buffer. |
| SCL | I²C clock input | Input with noise filter; edge-rate controlled to reduce EMI during 1 MHz operation. |
| OE | Active-low output enable | Asynchronous hardware override: disables all outputs to logic-high, logic-low, or high-Z state per MODE2 settings. |
| LED0–LED15 | LED driver outputs | Configurable totem-pole or open-drain; 5.5 V tolerant; directly drive ≤25 mA LEDs or interface with external MOSFETs. |
| VDD, VSS | Power supply terminals | VDD accepts 2.3–5.5 V; VSS is system ground reference; no internal LDO - requires clean, decoupled supply. |
Key Features
| Feature | Design Value |
|---|---|
| Software Reset (SWRST) | Full register reset via I²C address 06h; restores all registers to power-on defaults (outputs HIGH, OE-enabled state) without power cycle. |
| Output State Update Timing | Selectable change-on-ACK or change-on-STOP; enables atomic multi-register updates across multiple PCA9635PW/S911,118 devices for synchronized LED transitions. |
| Hot Insertion Support | Internal power-on reset and glitch-free startup; allows safe insertion into live I²C buses without disrupting communication or damaging connected devices. |
| ESD & Latch-up Robustness | 2000 V HBM, 200 V MM, 1000 V CDM ESD rating; >100 mA latch-up immunity per JEDEC JESD78 - suitable for industrial and handheld environments. |
| Low Standby Current | Typical 0.2 μA in sleep mode (SLEEP bit = 1); oscillator disabled; ideal for battery-powered status indicators requiring long idle periods. |
Applications
| RGB Status Indicators | Keypad Backlighting |
|---|---|
Use Scenario: Multi-color status feedback on industrial HMIs or medical device panels where red/green/amber states indicate operational modes or alarms. IC Role / Device Role / Timing Role: PCA9635PW/S911,118 acts as the dedicated LED timing and current controller, replacing discrete transistors and PWM timers. Use Value: Independent 97 kHz PWM per channel eliminates visible flicker; group blinking (e.g., alarm flash) uses identical GRPPWM/GRPFREQ values across all red LEDs for consistent visual rhythm. |
Use Scenario: Uniform backlighting for membrane keypads in portable test equipment or ruggedized handhelds with variable ambient light conditions. IC Role / Device Role / Timing Role: PCA9635PW/S911,118 serves as the centralized I²C-addressable backlight driver, accepting brightness commands from host MCU over shared bus. Use Value: 256-step group dimming (190 Hz) enables smooth, imperceptible brightness ramping; totem-pole outputs drive parallel LED strings directly without external drivers. |
| LED Display Segments | LCD Backlight Control |
Use Scenario: Driving alphanumeric LED segments in point-of-sale terminals or instrumentation displays requiring precise intensity matching across digits. IC Role / Device Role / Timing Role: PCA9635PW/S911,118 provides per-segment 8-bit brightness calibration via individual PWM registers, compensating for LED binning variance. Use Value: Linear 256-step control ensures consistent luminance gradation; hardware address pins allow daisy-chained display modules sharing one I²C bus. |
Use Scenario: Edge-lit LCD backlight in compact consumer electronics where space constraints prohibit multi-channel DC-DC solutions. IC Role / Device Role / Timing Role: PCA9635PW/S911,118 functions as the low-power, digitally controlled current sink array for white LED strings behind LCD glass. Use Value: 5.5 V-tolerant outputs simplify interface with 5 V LED forward voltage; 2.3 V minimum supply enables operation from single-cell Li-ion with buck regulator. |
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 (4096 steps), 30 MHz SPI interface; no I²C; requires external oscillator. | Higher resolution but lacks group dimming/blinking and I²C address flexibility; better for precision lighting, worse for bus-constrained designs. | Choose TLC5940RTQR when 12-bit grayscale fidelity outweighs I²C simplicity and group control needs. |
| IS31FL3728-QFLS4-TR | 18-channel, I²C, 8-bit PWM at 1.2 kHz; integrated auto-breathing; no individual/group separation; QFN-28 package. | Optimized for breathing effects and simpler UIs; lacks 97 kHz flicker-free operation and hardware address pins for large arrays. | Choose IS31FL3728-QFLS4-TR for cost-sensitive consumer UIs where breathing replaces discrete blink/dim logic. |
Compared with TLC5940RTQR and IS31FL3728-QFLS4-TR, the PCA9635PW/S911,118 uniquely balances I²C scalability (126-device bus), flicker-free 97 kHz per-channel control, and independent group dimming/blinking - making it optimal for industrial RGB status systems requiring both precision and synchronization.
Availability
PCA9635PW/S911,118 is available at Aetrix Electronics and suitable for RGB status indicators, keypad backlights, LED display segments, and LCD backlighting requiring stable component supply across industrial, medical, and consumer production programs.
Supply support for PCA9635PW/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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in mixed-signal ICs and interface technologies.
The PCA9635PW/S911,118 belongs to NXP's Fm+ I²C LED driver family, designed specifically for high-density, multi-device LED control in space-constrained embedded systems requiring flicker-free brightness and synchronized visual effects.
FAQ
What is the maximum I²C bus speed supported by the PCA9635PW/S911,118?
The PCA9635PW/S911,118 supports Fast-mode Plus (Fm+) I²C up to 1 MHz, enabling faster register writes and higher bus throughput than standard Fast-mode (400 kHz). Its 30 mA SDA output drive capability allows reliable operation on buses with up to 4000 pF capacitance - critical for systems with many I²C peripherals or long PCB traces. This specification is confirmed in Section 2 of the NXP Rev. 7.1 datasheet.
Can the PCA9635PW/S911,118 drive LEDs directly without external transistors?
Yes, the PCA9635PW/S911,118 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 only. It tolerates 5.5 V on all outputs, allowing direct connection to common 5 V LED strings rated ≤25 mA. For higher-current or high-voltage LEDs, external MOSFETs are recommended - as stated in Section 1 of the NXP Rev. 7.1 datasheet.
How does the PCA9635PW/S911,118 achieve synchronized blinking across multiple devices?
The PCA9635PW/S911,118 achieves synchronized blinking using either its active-low OE pin (hardware-level sync) or I²C Group Call addressing (E0h). When OE is pulsed externally, all connected devices blink simultaneously. Alternatively, writing to GRPPWM/GRPFREQ via the LED All Call address updates group parameters atomically across all devices on the bus - a capability documented in Sections 1 and 7.1.2 of the NXP Rev. 7.1 datasheet.
What is the function of the GRPFREQ register in the PCA9635PW/S911,118?
The GRPFREQ register (address 13h) sets the blinking period for group-level LED control when the DMBLNK bit in MODE2 is set to 1. It provides 256 linear steps mapping from 00h (41 ms / 24 Hz) to FFh (10.73 s), enabling precise timing of UI alerts or status pulses. When DMBLNK = 0, GRPFREQ is ignored and GRPPWM controls static dimming - as defined in Section 7.3.5 of the NXP Rev. 7.1 datasheet.
Does the PCA9635PW/S911,118 include an internal oscillator?
Yes, the PCA9635PW/S911,118 integrates a 25 MHz internal oscillator that requires no external components. This oscillator drives all timing functions including the 97 kHz individual PWM and 190 Hz group PWM, eliminating BOM cost and board space for crystals or RC networks. Its presence and specifications are explicitly stated in Section 2 (Features) and Figure 1 (Block Diagram) of the NXP Rev. 7.1 datasheet.
PCA9635PW/S911,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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/S911,118 FAQ
1.How can I place an order for PCA9635PW/S911,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9635PW/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 PCA9635PW/S911,118 reliable?
The price and inventory of PCA9635PW/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 PCA9635PW/S911,118 is usually 5 days.
3.What payment methods are accepted for PCA9635PW/S911,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9635PW/S911,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9635PW/S911,118?
PCA9635PW/S911,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9635PW/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 PCA9635PW/S911,118?
For technical support, including PCA9635PW/S911,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9635PW/S911,118 requirements.
6.How does Aetrix verify that PCA9635PW/S911,118 is sourced from the original manufacturer or authorized distributors?
All PCA9635PW/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 PCA9635PW/S911,118 meets industry standards.
7.What is the process for return or replacement of PCA9635PW/S911,118?
All PCA9635PW/S911,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9635PW/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 PCA9635PW/S911,118 part is unused and in its original packaging.
Return procedure for PCA9635PW/S911,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9635PW/S911,118 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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