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NXP Semiconductors PCA9551D,112
- Part No.:
- PCA9551D,112
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCA9551D,112.pdf
- Description:
- IC LED DRIVER PS PWM 25MA 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,118
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Product details
Overview
PCA9551D,112 from NXP Semiconductors is an 8-bit I²C-bus LED blinker with dual programmable blink rates (0.148 Hz to 38 Hz), internal oscillator, and open-drain outputs capable of sinking up to 25 mA per channel and 100 mA total. It offloads blink timing from the host MCU in embedded UIs, industrial status panels, and SMBus-compliant systems.
For engineers reviewing the PCA9551D,112 datasheet, PCA9551D,112 pinout, PCA9551D,112 application, or PCA9551D,112 equivalent, key selection considerations include its dual-rate PWM blink control, GPIO reuse capability for unused LED pins, SO16 package compatibility, 2.3 V–5.5 V supply range, and I²C Fast-mode (400 kHz) support.
Technical Context
The PCA9551D,112 integrates a dedicated internal oscillator-requiring no external components-to drive two independent blink rate generators (BLINK0/BLINK1), each with separate 8-bit prescaler (PSC0/PSC1) and PWM (PWM0/PWM1) registers. Its I²C interface complies with SMBus electrical specifications and includes noise filtering on SCL/SDA inputs.
Each of the eight LED outputs is individually configurable via LED selector registers (LS0/LS1) to operate as static ON/OFF, high-impedance (input), or blink at either BLINK0 or BLINK1 rate. The device supports hardware address selection (A0–A2), active-low RESET, and Power-On Reset (POR) with VPOR = 1.7–2.2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Blink Rate Range | 0.148 Hz to 38 Hz (6.74 s to 26 ms period); enables slow status indication or rapid visual feedback without host intervention |
| Output Sink Current | 25 mA per LED pin, 100 mA total package limit; supports direct driving of standard LEDs without external drivers |
| Supply Voltage | 2.3 V to 5.5 V; compatible with 3.3 V and 5 V logic domains in mixed-voltage systems |
| I²C Clock Frequency | Up to 400 kHz (Fast-mode); reduces bus transaction time during configuration and state updates |
| Standby Current | 1.9 µA typical at 5.5 V; critical for battery-powered devices requiring low quiescent power |
| ESD Protection | 2000 V HBM, 150 V MM, 1000 V CDM; meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | −40 °C to +85 °C; qualified for industrial and automotive cabin applications |
Pinout & Package
PCA9551D,112 is supplied in SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm pitch, 1.75 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware address inputs | Set slave address bits A2–A0; enable up to eight PCA9551D,112 devices on one I²C bus |
| LED0–LED7 | Open-drain LED driver outputs | Sink current to drive LEDs directly; configurable as GPIOs when set to high-impedance mode |
| VDD / VSS | Power supply / ground | 2.3–5.5 V operation; VSS must be connected to system ground for proper reset and register initialization |
| SCL / SDA | I²C serial clock / data | Standard-mode/Fast-mode compliant; include internal noise filters to suppress EMI-induced glitches |
| RESET | Active-low hardware reset | Asynchronous reset that forces all registers to default state (all outputs HIGH/LED off) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent blink rate generators | BLINK0 and BLINK1 each have dedicated 8-bit prescaler and PWM registers-enabling simultaneous different blink patterns (e.g., heartbeat + alert) |
| No external timing components required | Internal oscillator eliminates need for crystals, RC networks, or external clocks-reducing BOM count and board space |
| GPIO reuse of LED pins | Unused LEDn pins can serve as general-purpose inputs (high-Z + read via INPUT register) or outputs (with external pull-up) |
| I²C bus traffic reduction | Only one command needed to start/stop blinking per output-eliminates repeated host polling or timer-driven toggling |
| Robust power management | Power-On Reset (POR) and active-low RESET ensure deterministic startup and recovery; standby current < 3 µA |
Applications
| Industrial Control Panel | Consumer Electronics UI |
|---|---|
Use Scenario: Status indication for PLC I/O modules, motor starters, or safety interlocks using discrete LEDs. IC Role / Device Role / Timing Role: Offloads blink timing from the main controller; provides synchronized, glitch-free LED pulsing independent of firmware load. Use Value: Reduces I²C bus overhead by >90% versus software-timed toggling; ensures consistent blink behavior even during MCU interrupt latency spikes. | Use Scenario: Power-on sequence, charging status, or mode indicators on smart speakers, thermostats, or IoT hubs. IC Role / Device Role / Timing Role: Dedicated LED timing engine enabling multi-pattern visual feedback (e.g., breathing + pulse) without consuming host CPU cycles. Use Value: Enables rich UI effects with zero firmware involvement-improving responsiveness and simplifying host software architecture. |
| Automotive Cabin Interface | Network Equipment Status |
Use Scenario: Soft-touch button backlighting and function indicator LEDs in infotainment or climate control units. IC Role / Device Role / Timing Role: Drives multiple LEDs with precise duty cycle control (e.g., 25% for dimmed standby, 100% for active state). Use Value: Supports AEC-Q100-qualified designs via −40 °C to +85 °C operation and robust ESD immunity-no derating needed. | Use Scenario: Link/activity/status LEDs on switches, routers, and PoE injectors where reliable visual signaling is mission-critical. IC Role / Device Role / Timing Role: Provides fail-safe blink control that persists across host reboots or firmware hangs. Use Value: Eliminates dependency on host software for basic status visibility-ensuring network operators retain diagnostic visibility during outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED blinker applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9552D,112 | Same pinout and register map; adds individual LED brightness control via 6-bit PWM per channel | Required when per-LED dimming (not just blinking) is needed for color mixing or intensity grading | Select PCA9552D,112 only if brightness control is mandatory; otherwise PCA9551D,112 offers lower cost and simpler configuration |
| PCA9634PW,118 | Fast-mode Plus (1 MHz), 126 address options, 200 mA total sink, but no dedicated blink rate registers-requires host PWM generation | Suitable for high-channel-count RGB LED systems needing global + individual dimming, not autonomous blink timing | Choose PCA9634PW,118 for advanced lighting control; PCA9551D,112 remains optimal for pure blink-offload use cases |
Compared with PCA9552D,112 and PCA9634PW,118, the PCA9551D,112 uniquely delivers autonomous dual-rate blink timing with minimal configuration-making it the most efficient solution when host CPU offload and deterministic LED behavior are primary design goals.
Availability
PCA9551D,112 is available at Aetrix Electronics and suitable for industrial control panels, consumer electronics UIs, and automotive cabin interfaces requiring stable component supply and long-term manufacturability.
Supply support for PCA9551D,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.
The PCA9551D,112 belongs to NXP's I²C-bus peripheral family designed specifically to reduce host processor load in embedded systems requiring reliable, low-overhead LED control and GPIO expansion.
FAQ
What is the maximum blink frequency supported by PCA9551D,112?
The PCA9551D,112 supports a maximum blink frequency of 38 Hz (26 ms period), achieved by programming PSC0 or PSC1 to 0x00. This corresponds to the shortest possible blink interval while maintaining stable internal oscillator operation across temperature and voltage ranges.
Does PCA9551D,112 require external components to generate blink timing?
No, the PCA9551D,112 contains a fully integrated internal oscillator-no external crystal, resistor, or capacitor is required to configure or operate its dual blink rate generators (BLINK0 and BLINK1). This simplifies layout and improves reliability in space-constrained designs.
Can unused LED pins on PCA9551D,112 be used as general-purpose I/Os?
Yes, any LEDn pin not configured for blink or static LED control can be repurposed as a GPIO. Set its LED selector bits to '01' (high-impedance) to use as input (read via INPUT register), or connect an external pull-up and program '00' (LOW) or blink modes for output functionality.
What is the I²C address range supported by PCA9551D,112?
The PCA9551D,112 supports eight unique I²C slave addresses via hardware-selectable A0, A1, and A2 pins. With all three grounded, the base address is 0xC0; setting combinations yields addresses from 0xC0 to 0xC7 (binary 1100000x), enabling multi-drop bus configurations.
How does PCA9551D,112 handle power-up and reset conditions?
The PCA9551D,112 features both Power-On Reset (POR) and active-low hardware RESET. POR initializes all registers to default states (outputs HIGH/LED off) when VDD rises above VPOR (1.7–2.2 V). Asserting RESET LOW forces immediate return to this state, ensuring deterministic behavior after brownouts or system resets.
PCA9551D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
PCA9551D,112 FAQ
1.How can I place an order for PCA9551D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9551D,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 PCA9551D,112 reliable?
The price and inventory of PCA9551D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9551D,112 is usually 5 days.
3.What payment methods are accepted for PCA9551D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9551D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9551D,112?
PCA9551D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9551D,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 PCA9551D,112?
For technical support, including PCA9551D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9551D,112 requirements.
6.How does Aetrix verify that PCA9551D,112 is sourced from the original manufacturer or authorized distributors?
All PCA9551D,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 PCA9551D,112 meets industry standards.
7.What is the process for return or replacement of PCA9551D,112?
All PCA9551D,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9551D,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 PCA9551D,112 part is unused and in its original packaging.
Return procedure for PCA9551D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9551D,112 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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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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