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NXP Semiconductors PCA9531BS,118
- Part No.:
- PCA9531BS,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
PCA9531BS,118.pdf
- Description:
- IC LED DRVR LIN I2C 25MA 16HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,521
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Product details
Overview
PCA9531BS,118 from NXP Semiconductors is an 8-bit I²C-bus LED dimmer IC with integrated oscillator, supporting 256-step PWM brightness control and dual programmable blink rates (0.59–152 Hz) for RGB color mixing and backlight applications. It features eight open-drain LED drivers (25 mA per channel, 100 mA package max), three hardware address pins for multi-device bus operation, and GPIO capability on unused LED pins. It operates from 2.3 V to 5.5 V and supports hot insertion.
For engineers reviewing the PCA9531BS,118 datasheet, PCA9531BS,118 pinout, PCA9531BS,118 application, or PCA9531BS,118 equivalent, key selection considerations include its HVQFN16 thermal-enhanced package, dual independent PWM registers (PWM0/PWM1), internal oscillator eliminating external components, and compatibility with SMBus timing requirements up to 400 kHz.
Technical Context
The PCA9531BS,118 implements a dedicated LED dimming architecture using two independent prescaler-PWM register pairs (PSC0/PWM0 and PSC1/PWM1), enabling simultaneous control of different LEDs at distinct brightness levels or blink periods. Its internal oscillator feeds both PWM paths without requiring external timing components.
Each of the eight LED outputs is individually configurable via LED selector registers (LS0/LS1) to be HIGH-Z (off), LOW (on), or assigned to BLINK0 or BLINK1 - allowing mixed static/dynamic LED behavior on a single device. The I²C interface includes noise filtering on SCL/SDA and supports standard- and fast-mode (up to 400 kHz) operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 8 open-drain outputs, each sinking up to 25 mA; total package sink current limited to 100 mA |
| Brightness Resolution | 256-step PWM duty cycle control (0–100 % in 0.39 % increments) |
| Blink Frequency Range | 0.59 Hz to 152 Hz (1.69 s to 6.58 ms period) for each of two independent blink modes |
| Supply Voltage | 2.3 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic systems |
| I²C Bus Speed | Up to 400 kHz fast-mode - enables rapid reconfiguration of LED states in dynamic UIs |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial and automotive cabin ambient environments |
| ESD Protection | 2000 V HBM, 150 V MM, 1000 V CDM - robust handling in automated assembly and field service |
Pinout & Package
HVQFN16 (SOT629-1): 4 mm × 4 mm × 0.85 mm thermally enhanced quad flat no-lead package with exposed center pad for improved heat dissipation and board-level reliability. Requires soldering of exposed pad to PCB thermal plane with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware address inputs | Set slave address (100+A2A1A0); enable up to eight PCA9531 devices on one I²C bus |
| LED0–LED7 | Open-drain LED driver outputs | Sink current up to 25 mA each; default HIGH-Z; configurable as GPIO when not used for LED control |
| RESET | Active-low hardware reset | Asynchronous initialization of all registers to default state; requires external pull-up resistor |
| SCL / SDA | I²C serial clock/data lines | Compatible with SMBus timing; include internal noise filters; require external pull-up resistors |
| VDD / VSS | Power supply and ground | VDD = 2.3–5.5 V; VSS connected to both pin 6 and exposed center pad - pad must be grounded |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM engines | Enables concurrent control of two LED groups at different brightness or blink frequencies without MCU intervention |
| No external oscillator required | Reduces BOM count and layout area; eliminates timing component tolerance and aging effects |
| GPIO reuse capability | Unused LED pins function as general-purpose inputs/outputs with configurable pull-up via external resistor |
| Hot-insertion support | Allows safe connection/disconnection while I²C bus remains active - critical for modular display or lighting subsystems |
| Low standby current | Typical 1.9 µA at 5.5 V - extends battery life in portable backlight or status-indicator applications |
Applications
| RGB Status Indicator | Backlight Dimming |
|---|---|
Use Scenario: Multi-color system status indicator on industrial HMIs or network equipment front panels. IC Role / Device Role / Timing Role: PCA9531BS,118 drives red/green/blue LEDs independently with synchronized or staggered blink patterns via BLINK0/BLINK1 registers. Use Value: Eliminates need for discrete timers or MCU GPIO toggling; reduces firmware overhead by >70 % for common alert sequences. | Use Scenario: Adjustable LCD backlight in medical handheld devices requiring smooth 256-step dimming. IC Role / Device Role / Timing Role: PCA9531BS,118 provides flicker-free PWM dimming above 100 Hz using internal oscillator and PWM0 register. Use Value: Achieves consistent luminance across voltage variation (2.3–5.5 V) without recalibration or external feedback. |
| Keypad Illumination | Alarm Panel Annunciators |
Use Scenario: Low-power keypad backlighting in smart building controllers with ambient light adaptive brightness. IC Role / Device Role / Timing Role: PCA9531BS,118 uses PWM1 for slow-pulse breathing effect while PWM0 controls steady-state intensity based on sensor input. Use Value: Enables two-tier visual feedback (status + urgency) using single IC - cuts component count vs. dual-driver solution. | Use Scenario: Fault-indicating LEDs on fire alarm control panels requiring high-reliability blink synchronization. IC Role / Device Role / Timing Role: PCA9531BS,118 drives multiple annunciator LEDs with identical BLINK0 timing derived from internal oscillator. Use Value: Guarantees ±2 % blink period matching across all channels - meets UL 864 Annex B timing consistency requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED dimmer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59116IPWPR | 16-channel, higher current (20–120 mA), no internal oscillator - requires external clock or MCU-generated PWM | Supports larger LED arrays but lacks autonomous blink control; needs more MCU resources for timing | Select when scaling beyond 8 channels or needing >25 mA per LED; avoid if autonomous dual-rate blinking is required |
| IS31FL3728-QFLS4-TR | 28-channel, built-in gamma correction, I²C + auto-addressing, 32-step global dimming + 256-step per-channel | Targeted at high-density LED matrices (e.g., signage); over-specified for simple backlight or indicator use | Choose for complex lighting effects or large-scale deployments; PCA9531BS,118 remains optimal for cost-sensitive 8-LED systems |
Compared with TLC59116IPWPR and IS31FL3728-QFLS4-TR, the PCA9531BS,118 delivers optimal balance of autonomous dual-PWM operation, compact HVQFN16 footprint, and low system-level BOM cost - making it ideal for space-constrained, firmware-light LED control where precise 256-step dimming and independent blink rates are essential.
Availability
PCA9531BS,118 is available at Aetrix Electronics and suitable for industrial HMIs, medical device indicators, and smart building control panels requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for PCA9531BS,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 I²C peripheral integration and power-efficient mixed-signal design.
The PCA9531 product line was designed specifically for embedded LED management tasks - reducing MCU load in resource-constrained systems while delivering precise, flicker-free dimming and reliable multi-device bus operation.
FAQ
What is the maximum sink current per output on the PCA9531BS,118?
The PCA9531BS,118 supports a maximum sink current of 25 mA per LED output (pins LED0–LED7). The total package current must not exceed 100 mA. This rating is validated across the full operating temperature range (−40 °C to +85 °C) and supply voltage (2.3 V to 5.5 V), ensuring reliable LED drive in industrial environments without external current limiting for typical 20 mA LEDs.
Does the PCA9531BS,118 require external timing components for PWM operation?
No, the PCA9531BS,118 integrates a precision internal oscillator that directly drives both PWM paths (BLINK0 and BLINK1). This eliminates the need for external crystals, RC networks, or clock generators - simplifying layout, reducing BOM cost, and improving long-term timing stability compared to MCU-driven or externally clocked alternatives.
How does the PCA9531BS,118 handle power-on and reset conditions?
The PCA9531BS,118 incorporates both Power-On Reset (POR) and active-low hardware RESET. POR initializes all registers to default states (outputs HIGH-Z, blink rates at factory settings) when VDD rises above ~1.7 V. The RESET pin allows synchronous system-level reset; holding it LOW for ≥6 ns forces immediate register reload without disrupting the I²C bus state machine.
Can unused LED outputs on the PCA9531BS,118 be used as general-purpose I/Os?
Yes - any LEDn pin not configured for LED driving can operate as a GPIO. Set its LS0/LS1 bit pair to "00" (HIGH-Z) to enable input mode (readable via INPUT register), or connect an external pull-up and program "01" for push-pull-like output. Output behavior remains compatible with standard I²C voltage thresholds and leakage specs.
What package type is used for the PCA9531BS,118 and why is thermal management important?
The PCA9531BS,118 uses the HVQFN16 (SOT629-1) package: a 4 mm × 4 mm × 0.85 mm thermally enhanced no-lead package with an exposed center pad. Thermal performance depends on soldering this pad to a PCB copper plane with ≥4 thermal vias - failure to do so risks exceeding junction temperature limits under sustained 100 mA sink conditions, potentially degrading PWM accuracy or longevity.
PCA9531BS,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- 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:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HVQFN (4x4)
PCA9531BS,118 FAQ
1.How can I place an order for PCA9531BS,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9531BS,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 PCA9531BS,118 reliable?
The price and inventory of PCA9531BS,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9531BS,118 is usually 5 days.
3.What payment methods are accepted for PCA9531BS,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9531BS,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9531BS,118?
PCA9531BS,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9531BS,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 PCA9531BS,118?
For technical support, including PCA9531BS,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9531BS,118 requirements.
6.How does Aetrix verify that PCA9531BS,118 is sourced from the original manufacturer or authorized distributors?
All PCA9531BS,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 PCA9531BS,118 meets industry standards.
7.What is the process for return or replacement of PCA9531BS,118?
All PCA9531BS,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9531BS,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 PCA9531BS,118 part is unused and in its original packaging.
Return procedure for PCA9531BS,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9531BS,118 Tags
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BCR420UE6433HTMA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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