PCA9685PW,118 - 16-Ch 12-bit PWM LED Driver I2C | NXP
部品番号: PCA9685PW,118 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.35 | $3.35 |
| 10 | $2.95 | $29.50 |
| 100 | $2.55 | $255.00 |
| 500 | $2.25 | $1,125.00 |
| 1,000 | $1.99 | $1,990.00 |
PCA9685PW,118 概要
An LED driver IC is a specialized power-management device that translates low-power digital control signals into high-current outputs suitable for driving light-emitting diodes. Within the broader taxonomy, the PCA9685PW,118 belongs to the LED driver family, which itself is a sub-category of display drivers and power management ICs. LED drivers serve a critical role in modern electronics by providing constant-current regulation, PWM dimming, and bus-addressable control for everything from single status indicators to multi-channel RGB lighting arrays used in signage, automotive interiors, and consumer appliances.
Key features of the PCA9685PW,118 include a 1 MHz Fast-Mode Plus (Fm+) capable I2C interface, programmable push-pull or open-drain output stages, and a 40 ns transition time optimized for high-color-depth RGBA mixing. The device operates from 2.3 V to 5.5 V supply voltage, draws 10 mA typical quiescent current, and supports both LED dimming and digital servo control on the same pins. An external 25 MHz crystal is not required - an internal oscillator accepts a single resistor-timed reference. The TSSOP-28 package provides compact board integration suitable for handheld and embedded designs.
The PCA9685PW,118 is engineered around a 16-channel constant-current sink architecture with per-channel 12-bit PWM counters clocked from an internal 25 MHz oscillator. Each output provides a totem-pole driver capable of either sinking current to ground or sourcing current from V+ (software configurable), enabling direct driving of common-anode or common-cathode LED strings. The device supports cascaded operation by allowing up to 62 nodes on one I2C bus, with selectable base addresses set by external pull-ups on six address pins, making it ideal for matrix panels and large lighting arrays.
Typical applications include LCD TV and monitor backlight control, RGBW architectural lighting strips, servo motor control in robotics, and automotive interior ambient lighting. The 1 MHz I2C capability enables fast refresh rates across all 16 channels, suitable for color-mixing animations on large displays.
When designing with the PCA9685PW,118, ensure that the per-channel current does not exceed 25 mA and that total package dissipation stays below the thermal limit of the TSSOP-28 (theta_JA approximately 80 C/W). Adding small 0.1 uF ceramic decoupling capacitors near VDD and V+ pins is recommended for noise immunity.
ドロップイン代替品: PCA9685PW,118 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: PCA9685PW,118 （同一形状・フットプリント） — 相違点: PWM Resolution, Package, Output Enable Pin (OE), Product Type, I2C Interface.
クイック比較ツール — 並列比較する代替部品を選択:
PCA9685PW,112
✅ ドロップイン✓ 在庫あり
$1.78 / 個
データシートを見る →PCA9685PW/Q900,118
✅ ドロップイン📋 参考代替品（カタログ未掲載）
PCA9685PW,118 最大定格＆電気的特性
| 機能 | 16-channel 12-bit PWM LED controller |
| 出力数 | 16 |
| PWM Resolution | 12-bit (4096 steps, 0% to 100% duty cycle) |
| Per-Channel Output Current | 25 mA |
| トポロジー | Open-Drain / Push-Pull PWM |
| インターフェース | I2C-bus, Fast-Mode Plus (up to 1 MHz) |
| Supply Voltage VDD | 2.3 V to 5.5 V |
| Internal Oscillator Frequency | 25 MHz (typical) |
| Programmable I2C Addresses | Up to 62 devices per bus (6 address pins) |
| 動作温度 | -40 C to +85 C |
| パッケージ | 28-TSSOP (4.40 mm body width, SOT-355-1) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Lead-Free | Yes |
| Primary Application | RGBA backlighting and color mixing |
PCA9685PW,118 ピン構成
| ピン 1 | LED0 — LED driver output 0 (PWM) |
| ピン 2 | LED1 — LED driver output 1 (PWM) |
| ピン 3 | LED2 — LED driver output 2 (PWM) |
| ピン 4 | LED3 — LED driver output 3 (PWM) |
| ピン 5 | LED4 — LED driver output 4 (PWM) |
| ピン 6 | LED5 — LED driver output 5 (PWM) |
| ピン 7 | LED6 — LED driver output 6 (PWM) |
| ピン 8 | LED7 — LED driver output 7 (PWM) |
| ピン 9 | GND — Ground |
| ピン 10 | LED8 — LED driver output 8 (PWM) |
| ピン 11 | LED9 — LED driver output 9 (PWM) |
| ピン 12 | LED10 — LED driver output 10 (PWM) |
| ピン 13 | LED11 — LED driver output 11 (PWM) |
| ピン 14 | LED12 — LED driver output 12 (PWM) |
| ピン 15 | LED13 — LED driver output 13 (PWM) |
| ピン 16 | LED14 — LED driver output 14 (PWM) |
| ピン 17 | A0 — I2C address select bit 0 |
| ピン 18 | OE — Output Enable (active low) |
| ピン 19 | LED15 — LED driver output 15 (PWM) |
| ピン 20 | GND — Ground |
| ピン 21 | SDA — I2C serial data |
| ピン 22 | SCL — I2C serial clock |
| ピン 23 | A1 — I2C address select bit 1 |
| ピン 24 | A2 — I2C address select bit 2 |
| ピン 25 | A3 — I2C address select bit 3 |
| ピン 26 | A4 — I2C address select bit 4 |
| ピン 27 | VDD — Logic supply (2.3 V to 5.5 V) |
| ピン 28 | V+ — LED supply voltage |
主な用途
PCA9685PW,118 の用途: 7 件s: RGBA LED Backlight Control, Robotics Servo Control, RGB LED Strip Lighting, Automotive Interior Ambient Lighting, Industrial Status Indicators, Hobby Electronics & Maker Projects, Audio Visual Equipment LED Indicators.
RGBA LED Backlight Control
The PCA9685PW,118 is purpose-built for LCD Red/Green/Blue/Amber backlight control in monitors, TVs, and signage panels. Its 16 individually-programmable 12-bit PWM channels can drive four RGBW or RGBA strings from a single IC, enabling precise color-temperature and brightness mixing across the backlight zone. The 1 MHz Fast-Mode Plus I2C interface supports high refresh rates across cascaded PCA9685PW,118 devices, allowing synchronized multi-zone backlight dimming in edge-lit and direct-lit LED panels. The 25 mA per-channel drive is well-matched to the low-current indicator LEDs in backlight edge arrays. Placed between the LED supply rail and the LED string anode with a small sense resistor, the PCA9685PW,118 produces perceptibly continuous color gradients where 8-bit PWM drivers create visible stair-stepping.
おすすめ
Robotics Servo Control
The PCA9685PW,118 has become a de facto standard in hobby robotics for controlling up to 16 RC servos from a single I2C bus, freeing the host microcontroller from time-critical servo-pulse generation. With 12-bit PWM resolution (4096 steps), the PCA9685PW,118 provides approximately 0.088 degrees of angle resolution per step on a standard 180-degree servo, which exceeds the mechanical precision of most hobby servos. The programmable frequency range of 40 Hz to 1000 Hz covers the standard 50 Hz servo refresh rate. Cascading up to 62 PCA9685PW,118 devices on one bus drives 992 servos, suitable for hexapod walkers, animatronics, and humanoid robots. The TSSOP-28 package fits on compact breakout boards used with Arduino, Raspberry Pi, and ESP32 hosts.
おすすめ
RGB LED Strip Lighting
The PCA9685PW,118 drives addressable RGB and RGBW LED strips by controlling their three or four color channels through PWM dimming. The 16 outputs per IC can control up to 5 RGB strips (3 channels per strip) or 4 RGBW strips per device, with cascading up to 62 devices scaling to 992 independently controllable channels per bus. The 25 mA per-channel drive is suitable for low-current LED strip indicator lights and decorative ambient strips. For high-power LED strips exceeding 25 mA per channel, designers add MOSFET drivers downstream of the PCA9685PW,118. The TSSOP-28 footprint is widely available on inexpensive breakout modules used in hobby and stage-lighting installations.
おすすめ
Automotive Interior Ambient Lighting
The PCA9685PW,118 in its automotive-qualified Q900 variant (PCA9685PW/Q900,118) is widely used in vehicle interior ambient lighting applications, controlling RGB footwell lights, door-panel accents, and dashboard backlights from a single body-control module. The AEC-Q100 qualification makes the Q900 part suitable for under-hood and passenger-compartment environments. Its 16 channels can drive multiple RGB zones simultaneously with synchronized 12-bit PWM dimming. The I2C interface integrates cleanly with automotive body controllers and CAN gateway modules. Compared to discrete LED drivers, PCA9685PW/Q900,118 reduces PCB area, BOM cost, and software complexity for multi-zone lighting control.
おすすめ
Industrial Status Indicators
The PCA9685PW,118 drives multi-color status indicators on industrial control panels, network switches, and PLC HMI displays where 8 to 16 LEDs must be independently controlled from a single bus. Each channel's 12-bit PWM enables smooth color transitions for alerts (green to amber to red) and brightness adjustment for ambient light conditions. The I2C interface allows the host controller to update indicator states at high refresh rates without time-critical software servicing. The wide 2.3 V to 5.5 V supply range supports both 3.3 V industrial SBCs and legacy 5 V PLC backplanes. The PCA9685PW,118 replaces multiple discrete LED drivers and reduces panel wiring complexity.
おすすめ
Hobby Electronics & Maker Projects
The PCA9685PW,118 is one of the most popular LED and servo controller ICs in the maker community, available on inexpensive Adafruit and SparkFun breakout boards that expose all 16 PWM channels plus the I2C address pins. It is widely used with Arduino, Raspberry Pi, ESP32, and Micro:bit hosts to drive servos in robotic arms, RGB LEDs in costume props, and stepper motor emulation through PWM output. The 12-bit resolution and cascadable I2C interface let hobbyists scale from a single 16-channel breakout to multi-board installations with minimal wiring. The well-documented NXP register map has been ported to Arduino and CircuitPython libraries, making the PCA9685PW,118 accessible to non-engineers. It is often the first PWM controller that beginner embedded developers encounter.
おすすめ
Audio Visual Equipment LED Indicators
The PCA9685PW,118 drives VU meter LEDs, channel-strip indicators, and programmable button backlights on audio mixers and AV receivers where multiple RGB or single-color LEDs must respond smoothly to user input. Its 12-bit PWM resolution allows brightness transitions that match the smooth audio level metering without visible flicker. The 1 MHz I2C bus speed keeps latency low for real-time audio-following animations. The 28-TSSOP package fits on compact daughter-boards inside audio equipment housings. Compared to dedicated LED driver ICs with built-in color engines, the PCA9685PW,118's register-level PWM control gives AV designers complete freedom over dimming curves and animation patterns.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: PCA9685PW,118 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | PCA9685PW,112 | PCA9685PW/Q900,118 | PCA9685BS,118 |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Package | 28-TSSOP | 28-TSSOP - same | 28-TSSOP - same | 28-HVQFN - different footprint |
| Number of Channels | 16 | 16 | 16 | 16 |
| PWM Resolution | 12-bit (4096 steps) | 12-bit (4096 steps) | 12-bit (4096 steps) | 12-bit (4096 steps) |
| Per-Channel Current | 25 mA | 25 mA | 25 mA | 25 mA |
| Interface | I2C, up to 1 MHz | I2C, up to 1 MHz | I2C, up to 1 MHz | I2C, up to 1 MHz |
| Automotive Qualified | No | No | Yes (AEC-Q100 Q900) | No |
| Supply Voltage VDD | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Packaging Format | Tape and Reel (,118 suffix) | Tray (,112 suffix) | Tape and Reel with Q900 grade | Tape and Reel (HVQFN) |
主な差別化要因
- Highest PWM resolution per channel in TSSOP-28 I2C LED controllers （vs TLC59401)
- 62-device bus scalability via 6 hardware address pins （vs LP5018RSMR)
- Configurable output polarity for both common-anode and common-cathode LEDs （vs PCA9685BS,118)
- Automotive-qualified variant available in same package （vs PCA9685PW,112)
設計ノート
Decouple both VDD and V+ with 0.1 uF ceramic capacitors placed within 5 mm of the respective pins. The PCA9685PW,118 draws switching currents on V+ as each PWM output transitions; insufficient decoupling can cause logic-side voltage drops that corrupt I2C communication. For high-current LED strings, add a bulk 10 uF to 100 uF aluminum-polymer capacitor near V+ to handle transient loads. Estimated: total per-board decoupling cost is approximately 0.05 USD using common 0805 ceramic capacitors, but the noise-suppression benefit is significant in backlight applications where PWM edges couple into the LED supply rail.
The TSSOP-28 package has a thermal resistance theta_JA of approximately 80 C/W. With all 16 outputs driving 25 mA at 5 V V+, the package dissipates roughly 80 mW times the duty cycle, well within thermal limits for typical applications. However, when outputs source significant current at high duty cycles, monitor the PCB temperature near the IC and ensure adequate copper pour for heat spreading. For continuous full-output operation, design the PCB with at least 100 mm squared of 1 oz copper on the V+ and GND planes connected to the package thermal pad through stitching vias.
Place the PCA9685PW,118 near the I2C bus edge connector to minimize trace length. Keep I2C traces short (under 50 mm) and add 4.7 kohm pull-up resistors on SDA and SCL to VDD, sized to support the chosen bus speed. For Fast-Mode Plus (1 MHz) operation, reduce pull-up resistors to 2.2 kohm to meet the 20 ns rise-time requirement. Route LED outputs as parallel traces of equal length to maintain current-sharing when outputs are paralleled. Maintain at least 0.5 mm clearance between LED outputs and the VDD/V+ planes to prevent capacitive coupling that could disturb PWM edges.
Do not leave the OE (Output Enable, pin 18) pin floating; tie it to VDD through a 10 kohm resistor to enable outputs by default, or to a GPIO for hardware-level output control. Failing to configure the SLEEP bit correctly in MODE1 register can leave the oscillator off and outputs silent - the PCA9685PW,118 powers up in sleep mode by default and requires software wake-up. When cascading multiple PCA9685PW,118 devices, set unique I2C base addresses using the A0-A5 pins; otherwise bus conflicts will cause communication failures. Always verify the MODE1 RESTART bit clears after issuing a software restart, otherwise PWM outputs may remain off.
I2C signal integrity at 1 MHz Fast-Mode Plus speeds requires careful bus design. The PCA9685PW,118 specifies a maximum bus capacitance of 550 pF, including all device pins and trace capacitance. For long bus runs or many cascaded devices, use an I2C bus extender or buffer such as PCA9605 to maintain signal edges. Add series resistors (22-33 ohm) near the SDA/SCL pins of the master controller to dampen ringing on high-speed edges. For EMI-sensitive environments, place small ferrite beads on the LED supply lines to suppress PWM-edge harmonics radiating from LED output traces.
コンプライアンス情報
RoHS and REACH compliant per NXP product page. AEC-Q100 not applicable for the standard PCA9685PW,118 - choose PCA9685PW/Q900,118 for automotive grade. Lead-free reflow soldering per JEDEC J-STD-020.
