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STMicroelectronics LED1642GWPTR
- Part No.:
- LED1642GWPTR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LED1642GWPTR.pdf
- Description:
- IC LED DRVR LIN PWM 40MA 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:91,164
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Product details
Overview
LED1642GWPTR from STMicroelectronics is a 16-channel constant-current LED driver IC with integrated error detection, 7-bit programmable current gain (two ranges), and selectable 12/16-bit PWM grayscale control. It delivers 3–40 mA per channel, supports 3–5.5 V supply, and features 20 V output voltage rating for series LED strings - used in monochrome and full-color large-format signage displays.
For engineers reviewing the LED1642GWPTR datasheet, LED1642GWPTR pinout, LED1642GWPTR application, or LED1642GWPTR equivalent, key selection criteria include channel count, open/short LED diagnostic capability, programmable TON/TOFF timing, thermal shutdown behavior at 170 °C, and daisy-chain SDO synchronization support.
Technical Context
The LED1642GWPTR integrates a 16-bit shift register, 16 independent current-regulated output stages, and a configurable PWM counter driven by an external PWCLK signal. Its digital control logic uses LE-gated clock pulses to select between configuration register write/read, brightness register update, and error status reporting via SDO.
Current regulation relies on an external REXT resistor (100 Ω–100 kΩ) combined with a 7-bit gain register (CFG-0 to CFG-5 + CFG-6 range selector), enabling fine-grained adjustment across two sub-ranges. Error detection operates in dedicated diagnostic mode, identifying both open-circuit and shorted-LED faults using programmable voltage thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sinks, each independently controllable for LED string driving |
| Output current range | 3 mA to 40 mA per channel, set via REXT and 7-bit gain register |
| PWM resolution | Selectable 12-bit or 16-bit grayscale control per channel for precise brightness gradation |
| Max clock frequency | 30 MHz serial interface clock (CLK), enabling high-speed data loading in daisy-chain configurations |
| Error detection | Detects open and shorted LEDs; thresholds programmable via configuration register bits CFG-7 and CFG-9 |
| Thermal protection | Overtemperature alert at 150 °C; automatic output shutdown at 170 °C with 15–20 °C hysteresis |
| Supply voltage | 3.0 V to 5.5 V operation; UVLO threshold rises at 2.9 V and falls at 2.3 V |
Pinout & Package
TSSOP24 exposed pad package (RoHS-compliant, thermally enhanced); 0.65 mm pitch, 7.8 mm × 4.4 mm body size; exposed thermal pad must be soldered to PCB ground plane for optimal thermal performance (Rthj-amb = 37.5 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return path for all internal circuits and output current sinks |
| SDI | Serial data input | CMOS-compatible input accepting 16-bit channel data and register commands on CLK rising edge |
| CLK | Serial interface clock | Synchronizes data shifting; max 30 MHz; rise/fall time ≤5 µs recommended for cascade stability |
| LE | Latch enable | Edge-triggered control: rising edge latches data; falling edge initiates auto-power-down or wakeup sequence |
| OUT0–OUT15 | Constant-current outputs | 16 N-channel sink drivers rated to 20 V; each delivers regulated current based on REXT and gain setting |
| PWCLK | PWM clock input | External clock source (≤30 MHz) driving the grayscale counter; internal 500 kΩ pull-up resistor |
| SDO | Serial data output | Daisy-chain output; configurable sync on CLK falling edge (CFG-13); supports readback of error flags and config register |
| R-EXT | Current programming node | Connects external resistor (100 Ω–100 kΩ) to set base current; voltage at this pin determines full-scale output |
| VDD | Power supply | 3.0–5.5 V input; powers logic core and output drivers; includes UVLO and internal regulation |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output slew rate | Four selectable TON/TOFF combinations (30–180 ns rise, 20–150 ns fall) reduce EMI and inrush current |
| Gradual output delay | Channel-to-channel staggered turn-on (10 ns step) minimizes peak supply current during global enable |
| Auto power management | Configurable auto-shutdown (100 ns delay) and auto-wakeup (3 µs delay) eliminate need for external control logic |
| Diagnostics with threshold tuning | Shorted-LED detection threshold adjustable from 0.3 V to 1.5 V; open-LED detection enabled via CFG-7 |
| Thermal flag signaling | Dedicated flag bit indicates junction temperature ≥150 °C; enables system-level thermal throttling before shutdown |
Applications
| LED Signage Control | Full-Color Video Wall Driver |
|---|---|
|
Use Scenario: Driving segmented monochrome LED modules in outdoor advertising signs with ambient temperature variation from −40 °C to +85 °C. IC Role / Device Role / Timing Role: Constant-current sink for 16 parallel LED segments; PWM brightness synchronized to video frame rate via PWCLK. Use Value: Open/short diagnostics prevent partial display failure; thermal flag allows predictive maintenance before 170 °C shutdown occurs. |
Use Scenario: Pixel-level grayscale control in indoor high-resolution RGB LED video walls requiring smooth 16-bit luminance transitions. IC Role / Device Role / Timing Role: 16-channel grayscale engine per RGB subpixel group; daisy-chained SDO enables compact controller-to-panel routing. Use Value: 16-bit PWM resolution eliminates visible contouring; gradual output delay reduces 12 V rail current spikes during frame updates. |
| Industrial Panel Indicator Array | Architectural Lighting String Controller |
|
Use Scenario: Status indication on factory HMIs where reliability under vibration and ESD stress is critical. IC Role / Device Role / Timing Role: Fault-tolerant current driver with built-in short/open detection; LE-triggered auto-wakeup restores illumination after brownout. Use Value: ±3% output matching (at 36 mA) ensures uniform LED intensity across panels; ±2 kV HBM ESD rating protects against handling damage. |
Use Scenario: Driving long series-connected white LED strings (e.g., 5–8 LEDs @ 3.2 V each) in commercial façade lighting. IC Role / Device Role / Timing Role: High-voltage sink driver (20 V rated) with programmable TON to limit inrush into capacitive string loads. Use Value: 20 V output rating supports up to 6× white LEDs in series; dropout voltage <0.8 V at 36 mA maintains efficiency at low VDD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947IPWPR | 24-channel, no open/short detection; 12-bit PWM only; requires external VREF for current setting | Lacks integrated diagnostics and thermal flag; better suited for cost-sensitive non-critical indicator use | Choose when higher channel density is needed and fault detection is handled externally |
| IS31FL3728-QFLS4-TR | 18-channel, I²C interface; built-in temperature compensation; no REXT programming | Uses fixed internal current sources; no external resistor tuning; lower max output voltage (17 V) | Prefer for space-constrained designs needing I²C simplicity and automatic thermal derating |
Compared with LED1642GWPTR, TLC5947IPWPR offers more channels but sacrifices diagnostic capability and thermal visibility, while IS31FL3728-QFLS4-TR simplifies layout with I²C but limits output voltage headroom and removes analog current calibration.
Availability
LED1642GWPTR is available at Aetrix Electronics and suitable for LED signage, architectural lighting, and industrial HMI applications requiring stable component supply, long-term manufacturability, and automotive-grade thermal resilience.
Supply support for LED1642GWPTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.
The LED1642GW product line targets high-reliability LED display systems requiring integrated diagnostics, thermal awareness, and flexible grayscale control - designed specifically for large-format signage and professional lighting infrastructure.
FAQ
What is the maximum number of LED1642GWPTR devices that can be daisy-chained?
Up to 16 devices can be cascaded using the SDO-to-SDI connection, limited by cumulative CLK propagation delay and setup/hold timing margins. At 30 MHz clock, practical daisy-chain depth is 8–12 devices with proper PCB layout and termination; the SDO synchronization option (CFG-13) improves timing margin in deep chains.
How does the open-LED detection function operate?
Open-LED detection activates when the output voltage exceeds 19 V while current is commanded ON; the device flags the fault in its error register and asserts the thermal flag if sustained. Detection sensitivity is fixed - no user threshold adjustment - and requires the output to be disconnected from any external pull-up or clamping network.
Can LED1642GWPTR drive common-anode LED configurations?
No - LED1642GWPTR provides only constant-current sink outputs (OUT0–OUT15) and requires LEDs to be wired in common-anode topology. Each output connects to the cathode of its LED segment; the anode ties to a positive rail (≤20 V). Common-cathode configurations require external high-side switches.
What is the role of the R-EXT pin during auto power-down mode?
During auto power-down (enabled via CFG-10), the internal reference at R-EXT is disabled and the pin voltage drops to near 0 V within 100 ns; this action disables all output current sources and places the device in ultra-low quiescent state (200–500 µA). Re-enabling requires LE pulse and valid configuration reload.
LED1642GWPTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 19V
- Current - Output / Channel:
- 40mA
- Frequency:
- 30MHz
- Dimming:
- PWM
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QSOP
LED1642GWPTR FAQ
1.How can I place an order for LED1642GWPTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LED1642GWPTR 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 LED1642GWPTR reliable?
The price and inventory of LED1642GWPTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LED1642GWPTR is usually 5 days.
3.What payment methods are accepted for LED1642GWPTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LED1642GWPTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LED1642GWPTR?
LED1642GWPTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LED1642GWPTR 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 LED1642GWPTR?
For technical support, including LED1642GWPTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LED1642GWPTR requirements.
6.How does Aetrix verify that LED1642GWPTR is sourced from the original manufacturer or authorized distributors?
All LED1642GWPTR 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 LED1642GWPTR meets industry standards.
7.What is the process for return or replacement of LED1642GWPTR?
All LED1642GWPTR units undergo pre-shipment inspection (PSI). If there is an issue with LED1642GWPTR, 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 LED1642GWPTR part is unused and in its original packaging.
Return procedure for LED1642GWPTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LED1642GWPTR Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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