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NXP Semiconductors PCA9531D,112
- Part No.:
- PCA9531D,112
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCA9531D,112.pdf
- Description:
- IC LED DRVR LINEAR I2C 25MA 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,476
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Product details
Overview
The PCA9531D,112 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 backlighting. It features eight open-drain LED drivers (25 mA per channel, 100 mA total), GPIO capability on unused pins, and operates from 2.3 V to 5.5 V. It is used in display backlight control and status indicator systems requiring precise, low-pin-count LED management.
For engineers reviewing the PCA9531D,112 datasheet, PCA9531D,112 pinout, PCA9531D,112 application, or PCA9531D,112 equivalent, key selection criteria include I²C address configurability (A0–A2), dual independent PWM timing registers (PSC0/PWM0 and PSC1/PWM1), 256-step dimming resolution, open-drain sink capability, and SO16 package compatibility with industrial temperature range (−40 °C to +85 °C).
Technical Context
The PCA9531D,112 implements a dedicated internal oscillator driving two independent PWM channels-BLINK0 and BLINK1-each with fully programmable prescaler (PSC0/PSC1) and duty cycle (PWM0/PWM1) registers. Blink periods range from 6.58 ms to 1.69 s, enabling both imperceptible dimming (>100 Hz) and visible blinking modes.
Its I²C interface complies with SMBus specifications, includes noise filtering on SCL/SDA, supports standard- and fast-mode (up to 400 kHz), and features hardware reset (active LOW RESET) and Power-On Reset (VPOR = 1.7–2.2 V). All eight LED outputs are configurable via LED selector registers (LS0/LS1) for ON/OFF/BLINK0/BLINK1 states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 8 open-drain outputs; each sinks up to 25 mA, total package sink current ≤100 mA |
| Blink Frequency Range | 0.59 Hz to 152 Hz (6.58 ms to 1.69 s period); set via 8-bit PSC0/PSC1 registers |
| Brightness Resolution | 256-step PWM duty cycle (0–255); PWM0/PWM1 values directly define % ON-time |
| Supply Voltage | 2.3 V to 5.5 V; supports mixed-voltage I²C bus operation with level-shifted inputs |
| I²C Speed | Up to 400 kHz fast-mode; compatible with SMBus timing and ACK protocols |
| Operating Temp | −40 °C to +85 °C ambient; validated for industrial-grade embedded lighting control |
| ESD Protection | ≥2000 V HBM, ≥150 V MM, ≥1000 V CDM; suitable for handling in non-ESD-controlled assembly |
Pinout & Package
PCA9531D,112 is supplied in SO16 (SOT109-1) package: plastic small outline, 16-lead, 3.9 mm body width, surface-mount. Pin 1 index marked; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | I²C slave address inputs | Hardware-selectable bits; enable up to 8 devices on same bus (base address 0xC0) |
| LED0–LED7 | Open-drain LED driver outputs | Sink current up to 25 mA each; default high-impedance (LED off) after POR |
| RESET | Active LOW hardware reset | Holding LOW ≥6 ns forces register reload to defaults; requires external pull-up |
| SCL / SDA | I²C serial clock/data lines | With internal noise filters; support standard/fast-mode; require external pull-ups |
| VDD / VSS | Power supply and ground | VDD = 2.3–5.5 V; VSS must be connected to system ground; no internal VDD decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM engines | Separate PSC0/PWM0 and PSC1/PWM1 registers allow simultaneous distinct blink rates and brightness levels per LED group |
| No external oscillator required | On-chip oscillator eliminates need for crystal, capacitor, or resistor timing components-reducing BOM and board area |
| GPIO reuse capability | Unused LEDn pins function as general-purpose inputs/outputs with configurable pull-up via external resistor and read-back via INPUT register |
| Robust I²C interface | Input filters suppress noise; edge-rate control prevents EMI; hot-insertion safe; glitch-free power-up behavior |
| Low-power standby mode | Typical standby current of 1.9 µA at 5.5 V enables battery-backed status indicators with multi-year runtime |
Applications
| RGB Status Indicator | Display Backlight Control |
|---|---|
Use Scenario: Embedded system front panel with tri-color status LED indicating power, fault, and communication states. IC Role / Device Role / Timing Role: PCA9531D,112 drives red/green/blue LEDs independently using BLINK0 and BLINK1 for distinct visual alerts (e.g., slow blink = warning, fast blink = error). Use Value: Eliminates MCU GPIO overhead and software PWM; 256-step dimming enables calibrated color balance without external DACs or op-amps. | Use Scenario: Small-format LCD module (e.g., industrial HMI, medical display) requiring uniform, flicker-free backlight intensity control. IC Role / Device Role / Timing Role: PCA9531D,112 acts as I²C-controlled constant-current sink for white LED strings, using >100 Hz BLINK0 to achieve invisible PWM dimming. Use Value: Reduces MCU interrupt load and timing-critical code; SO16 footprint simplifies layout versus discrete FET+driver solutions. |
| ACPI Power Switch Interface | Fan Speed Monitor & Alert |
Use Scenario: Notebook or server motherboard implementing ACPI-compliant power button and lid switch detection with LED feedback. IC Role / Device Role / Timing Role: PCA9531D,112 configures LED0–LED3 as GPIO inputs (via LSx=00) for switch sensing and LED4–LED7 as controlled outputs for status indication. Use Value: Single IC replaces separate I/O expander + LED driver; input filtering ensures reliable switch debounce without firmware polling. | Use Scenario: Industrial controller monitoring cooling fan RPM via tachometer signal and illuminating alert LED upon stall or overtemp. IC Role / Device Role / Timing Role: PCA9531D,112 reads fan tach signal on LED6 (configured as GPIO input), then blinks LED7 at user-defined rate (BLINK1) when threshold exceeded. Use Value: Enables real-time hardware-triggered visual alerts without CPU intervention; 1.69 s max blink period covers slow-failure detection windows. |
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, I²C, 12-bit PWM (4096 steps); no internal oscillator; requires external clock or MCU timing | Higher resolution & channel count; suited for complex displays, not cost-sensitive indicator panels | Select when >256 brightness steps or >8 channels are required; accept added complexity and BOM cost |
| PCA9635PW,118 | 16-bit PWM resolution; auto-increment I²C addressing; higher max sink current (25 mA per channel, 120 mA total) | Designed for high-fidelity LED animation; includes walk-through and breath modes not present in PCA9531D,112 | Choose for dynamic lighting effects; avoid if only basic dimming/blink is needed and SO16 footprint is fixed |
Compared with TLC59116IPWPR and PCA9635PW,118, the PCA9531D,112 offers optimal balance of integration (on-chip oscillator), compact SO16 packaging, and sufficient 256-step resolution for status/backlight use cases-without over-engineering for high-end display applications.
Availability
PCA9531D,112 is available at Aetrix Electronics and suitable for RGB status indicators, display backlight control, ACPI power switch interfaces, and fan speed alert systems requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for PCA9531D,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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The PCA9531D,112 belongs to NXP's I²C-bus interface and LED driver product line, designed specifically for low-pin-count, low-software-overhead LED control in space-constrained embedded systems.
FAQ
What is the maximum LED sink current per channel for the PCA9531D,112?
The PCA9531D,112 supports a maximum output sink current of 25 mA per LED channel (LED0–LED7). This is specified under DC operating conditions with VOL ≤ 0.4 V at VDD = 5.0 V. The total package sink current must not exceed 100 mA to maintain thermal integrity and voltage regulation within the device.
Does the PCA9531D,112 require external timing components to operate its PWM functions?
No-the PCA9531D,112 integrates a precision internal oscillator that drives both PWM channels. No external crystal, RC network, or clock source is needed. The blink frequency and duty cycle are fully programmable via PSC0/PWM0 and PSC1/PWM1 registers, making the PCA9531D,112 a self-contained LED dimming solution.
Can unused LED pins on the PCA9531D,112 be repurposed as general-purpose inputs or outputs?
Yes. Pins LED0–LED7 can be configured as GPIOs by setting their corresponding bits in the LS0/LS1 registers to '00' (high-impedance input) or '01' (active-low output). Input state is readable via the INPUT register; output drive requires an external pull-up resistor sized per the target logic level and load.
What I²C address does the PCA9531D,112 use when A0=A1=A2=LOW?
When all address pins A0, A1, and A2 are pulled LOW, the PCA9531D,112 uses the base 7-bit I²C slave address 0x60 (1100000b). The full 8-bit address byte becomes 0xC0 for write operations and 0xC1 for read operations, consistent with standard I²C protocol formatting.
How does the PCA9531D,112 handle power-on and hardware reset events?
The PCA9531D,112 incorporates both Power-On Reset (POR) and active LOW hardware RESET. POR initializes all registers to default states (e.g., outputs high-impedance, blink rates at factory settings) when VDD rises above VPOR (1.7–2.2 V). Hardware RESET forces identical initialization when the RESET pin is held LOW for ≥6 ns, enabling deterministic recovery during system faults.
PCA9531D,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:
- 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-SO
PCA9531D,112 FAQ
1.How can I place an order for PCA9531D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9531D,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 PCA9531D,112 reliable?
The price and inventory of PCA9531D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9531D,112 is usually 5 days.
3.What payment methods are accepted for PCA9531D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9531D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9531D,112?
PCA9531D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9531D,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 PCA9531D,112?
For technical support, including PCA9531D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9531D,112 requirements.
6.How does Aetrix verify that PCA9531D,112 is sourced from the original manufacturer or authorized distributors?
All PCA9531D,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 PCA9531D,112 meets industry standards.
7.What is the process for return or replacement of PCA9531D,112?
All PCA9531D,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9531D,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 PCA9531D,112 part is unused and in its original packaging.
Return procedure for PCA9531D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9531D,112 Tags
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