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NXP Semiconductors PCA9634D,112
- Part No.:
- PCA9634D,112
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PCA9634D,112.pdf
- Description:
- IC LED DRIVER PS I2C 25MA 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,911
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Product details
Overview
PCA9634D,112 from NXP Semiconductors is an 8-bit Fast-mode Plus (Fm+) I²C-bus LED driver optimized for RGBA color mixing, featuring 8 independent 97 kHz PWM channels (256-step brightness), one 190 Hz/24 Hz–10.73 s group PWM controller, totem-pole or open-drain output configuration (25 mA sink / 10 mA source at 5 V), and operation from 2.3 V to 5.5 V. It enables synchronized LED dimming and blinking in displays, status indicators, and keypad backlights.
For engineers reviewing the PCA9634D,112 datasheet, PCA9634D,112 pinout, PCA9634D,112 application, or PCA9634D,112 equivalent, key selection considerations include its Fm+ 1 MHz I²C interface with 30 mA SDA drive strength, hardware addressability up to 126 devices, software-programmable Group/All Call addressing, OE-driven hardware dimming/blinking, and SO20 package compatibility with industrial temperature range (−40 °C to +85 °C).
Technical Context
The PCA9634D,112 integrates a 25 MHz internal oscillator (no external components required) and supports dual-layer PWM control: individual 97 kHz PWM per LED (256-step linear duty cycle) plus group-level 190 Hz fixed or programmable-frequency (24 Hz–10.73 s) PWM for global dimming or blinking. Its MODE1/MODE2 registers configure sleep mode, subaddress enablement, output polarity (INVRT), output change timing (on ACK or STOP), and output structure (totem-pole vs. open-drain).
I²C communication uses a 7-bit slave address with 7 hardware address pins (A0–A6), supporting up to 126 unique addresses; reserved addresses include Software Reset (00000110), LED All Call (1110000X), and three Sub Call addresses (E2h, E4h, E8h). Auto-increment modes (AI[2:0]) enable sequential register access across individual brightness (PWM0–PWM7), group control (GRPPWM/GRPFREQ), and output state (LEDOUT0/LEDOUT1) registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Bus Speed | Up to 1 MHz (Fast-mode Plus), enabling high-density bus operation up to 4000 pF capacitance |
| Individual PWM Frequency | 97 kHz fixed frequency with 256-step (8-bit) linear duty cycle (0 % to 99.6 %) |
| Group PWM Frequency | Fixed 190 Hz or programmable 24 Hz to 10.73 s period (256-step GRPFREQ register) |
| Output Drive Capability | Totem-pole: 25 mA sink / 10 mA source at 5 V; open-drain: 25 mA sink at 5 V |
| Supply Voltage Range | 2.3 V to 5.5 V; outputs tolerant to 5.5 V - supports direct LED connection without level shifters |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial and consumer embedded applications |
| Hardware Address Pins | 7 pins (A0–A6) enabling up to 126 uniquely addressable devices on a single I²C bus |
Pinout & Package
PCA9634D,112 is supplied in SO20 (plastic small outline, 20-lead, 7.5 mm body width, SOT163-1). Pin functions are validated per NXP datasheet Rev. 7.1 (2017), with VDD (pin 20), VSS (pin 10), SCL (pin 18), SDA (pin 19), OE (pin 15), and eight LED outputs (LED0–LED7, pins 6–9 and 11–14).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A6 | Hardware I²C address inputs | Set 7-bit slave address; pull HIGH/LOW externally - no internal pull-ups |
| SDA | I²C bidirectional data line | 30 mA high-drive capability supports heavy capacitive buses (up to 4000 pF) |
| SCL | I²C clock input | Accepts standard and Fast-mode Plus clock frequencies up to 1 MHz |
| OE | Active-low output enable | Asynchronous hardware control: sets all LED outputs to defined logic state (1, 0, or high-Z) when HIGH |
| LED0–LED7 | Configurable LED driver outputs | Software-selectable totem-pole or open-drain; each drives up to 25 mA directly |
| VDD / VSS | Power supply terminals | 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 output HIGH (LED off) |
| Group & Individual PWM Mixing | Each LED independently controlled by 97 kHz PWM while simultaneously modulated by shared 190 Hz or programmable group PWM - enables precise RGBA color blending |
| Four Programmable I²C Addresses | One LED All Call (E0h) + three Sub Call (E2h/E4h/E8h) addresses - allows simultaneous control of LED groups (e.g., all reds) with minimal bus traffic |
| No Glitch on Power-Up | Internal power-on reset ensures outputs remain in known HIGH (off) state until configured - prevents unintended LED activation |
| Hot Insertion Support | Robust I/O architecture with noise filtering on SDA/SCL and edge-rate control on outputs - safe for live bus insertion |
Applications
| RGB LED Status Indicators | Keypad Backlighting |
|---|---|
Use Scenario: Multi-color status indication on industrial HMIs or network equipment panels using discrete RGB LEDs. IC Role / Device Role / Timing Role: PCA9634D,112 provides independent 97 kHz PWM per channel and synchronized group blinking to encode fault states, activity, or priority levels. Use Value: Eliminates microcontroller GPIO overhead and timer resources; enables smooth, flicker-free color transitions with hardware-based timing stability. |
Use Scenario: Uniform backlight dimming and animated effects (e.g., breathing, marquee) on mobile phone or POS terminal keypads. IC Role / Device Role / Timing Role: PCA9634D,112 acts as dedicated backlight controller, using Group PWM for global dimming and Sub Call addressing to animate subsets of keys. Use Value: Reduces host MCU firmware complexity; supports low-power sleep mode (SLEEP bit) while maintaining responsive LED control via I²C wake-up. |
| LCD Backlight Control | LED Display Modules |
Use Scenario: Edge-lit or array-based LCD backlight requiring uniform intensity and dynamic dimming across multiple white LEDs. IC Role / Device Role / Timing Role: PCA9634D,112 drives parallel LED strings in totem-pole mode, applying identical Group PWM (190 Hz) for smooth analog-like dimming without visible ripple. Use Value: Achieves >1000:1 dimming ratio using 256-step group control; 5.5 V-tolerant outputs simplify interface with higher-Vf white LEDs. |
Use Scenario: Dot-matrix or segmented LED displays in consumer electronics where compact size and I²C scalability are critical. IC Role / Device Role / Timing Role: PCA9634D,112 serves as display segment driver, leveraging 126-device address space and All Call to initialize or clear entire displays atomically. Use Value: Enables daisy-chained multi-display systems with single I²C master; OE pin allows hardware-synchronized frame blanking or strobing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59116IPWR | 400 kHz I²C (standard mode), no group blinking frequency programming; 12-bit PWM resolution (4096 steps) | Lacks programmable group blink period (fixed 24 Hz); better suited for high-resolution dimming over speed | Select when ultra-fine brightness gradation is prioritized over flexible blinking timing or Fm+ bus density |
| IS31FL3728-QFLS4-TR | 1.2 MHz I²C, integrated current regulation per channel (25 mA), no hardware address pins (only 2 fixed addresses) | Supports auto-breathing and frame sync but lacks All Call/Sub Call addressing; requires external current-setting resistors | Select for simplified layout with built-in current control and higher-speed bus, accepting reduced device count scalability |
Compared with TLC59116IPWR and IS31FL3728-QFLS4-TR, PCA9634D,112 uniquely balances 1 MHz Fm+ bus performance, 126-device addressability, fully programmable group blink timing (24 Hz–10.73 s), and hardware-configurable output structure - making it optimal for scalable, timing-critical RGBA systems.
Availability
PCA9634D,112 is available at Aetrix Electronics and suitable for RGB status indicators, keypad backlights, LCD backlights, LED display modules, and industrial HMI interfaces requiring stable component supply and long-term production continuity.
Supply support for PCA9634D,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 LED control ICs.
The PCA9634D,112 belongs to NXP's Fast-mode Plus LED driver family, designed specifically for high-density, multi-node I²C LED systems requiring precise color mixing, synchronized blinking, and robust industrial operation.
FAQ
What is the maximum I²C bus speed supported by PCA9634D,112?
The PCA9634D,112 supports Fast-mode Plus (Fm+) I²C operation up to 1 MHz, with 30 mA SDA output drive strength enabling reliable communication on buses with up to 4000 pF total capacitance - significantly higher than standard Fast-mode (400 kHz) devices. This allows dense node deployments without signal integrity degradation.
Can PCA9634D,112 drive LEDs directly without external transistors?
Yes, PCA9634D,112 can drive LEDs directly: its totem-pole outputs deliver 25 mA sink / 10 mA source at 5 V, and open-drain outputs support 25 mA sink at 5 V. With 5.5 V-tolerant outputs and 2.3–5.5 V supply range, it interfaces natively with common 2–3.6 V LEDs and eliminates need for external drivers in low-to-mid current applications.
How does the Group PWM functionality work in PCA9634D,112?
In PCA9634D,112, Group PWM operates either as fixed 190 Hz dimming (DMBLNK = 0) or programmable blinking (DMBLNK = 1, 24 Hz–10.73 s period via GRPFREQ register). The GRPPWM register sets duty cycle (0 %–99.6 %) for both modes. When enabled (LDRx = 11), group control mixes multiplicatively with individual 97 kHz PWM for unified brightness or blink control across all 8 channels.
What is the purpose of the OE (Output Enable) pin on PCA9634D,112?
The active-low OE pin on PCA9634D,112 provides asynchronous hardware control: when HIGH, it forces all LED outputs into a user-defined state (logic 1, 0, or high-Z per MODE2's OUTNE bits); when LOW, outputs follow programmed PWM and LEDOUT settings. It enables synchronized blinking/dimming across multiple PCA9634D,112 devices using an external clock - independent of I²C traffic.
Does PCA9634D,112 require an external crystal or RC network?
No, PCA9634D,112 integrates a 25 MHz internal oscillator with no external components required. This oscillator powers all timing functions - including 97 kHz individual PWM, 190 Hz group PWM, and I²C timing - ensuring consistent, jitter-free LED control without board space or BOM cost for external timing elements.
PCA9634D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-SO
PCA9634D,112 FAQ
1.How can I place an order for PCA9634D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9634D,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 PCA9634D,112 reliable?
The price and inventory of PCA9634D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9634D,112 is usually 5 days.
3.What payment methods are accepted for PCA9634D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9634D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9634D,112?
PCA9634D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9634D,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 PCA9634D,112?
For technical support, including PCA9634D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9634D,112 requirements.
6.How does Aetrix verify that PCA9634D,112 is sourced from the original manufacturer or authorized distributors?
All PCA9634D,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 PCA9634D,112 meets industry standards.
7.What is the process for return or replacement of PCA9634D,112?
All PCA9634D,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9634D,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 PCA9634D,112 part is unused and in its original packaging.
Return procedure for PCA9634D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9634D,112 Tags
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