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STMicroelectronics LED1642GWQTR
- Part No.:
- LED1642GWQTR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
LED1642GWQTR.pdf
- Description:
- IC LED DRVR LIN PWM 40MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:118,499
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Product details
Overview
LED1642GWQTR 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 full-color signage and large-panel displays requiring precise brightness uniformity and fault resilience.
For engineers reviewing the LED1642GWQTR datasheet, LED1642GWQTR pinout, LED1642GWQTR application, or LED1642GWQTR equivalent, key selection criteria include channel-to-channel current matching (±3% typ.), open/short LED diagnostic thresholds, gradual output delay for inrush control, thermal shutdown at 170 °C, and 30 MHz serial interface timing compliance in daisy-chain configurations.
Technical Context
The LED1642GWQTR integrates a 16-bit shift register, 16 independent regulated current sinks, and a configurable PWM counter driven by an external PWCLK signal. Its digital control logic uses LE-gated clock pulses to access configuration, brightness, and error registers via a 4-wire serial interface.
Current regulation is set by an external R-EXT resistor and fine-tuned via a 7-bit gain register split across two current ranges (CFG-6 bit selects range). Error detection operates in real time on all 16 outputs, distinguishing open-circuit and shorted-LED faults using programmable voltage thresholds and minimum ON-time validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sinks, each independently controllable for monochrome or RGB LED panel segmentation. |
| Output current range | 3 mA to 40 mA per channel, set by external R-EXT (100 Ω–100 kΩ) and adjusted ±3% typical accuracy over voltage/temp. |
| PWM resolution | Selectable 12-bit (4096 steps) or 16-bit (65536 steps) grayscale control per channel for high-fidelity luminance gradation. |
| Error detection | Dual-mode diagnostics: open-LED (VOUT > threshold) and shorted-LED (VOUT < threshold), both programmable and validated per output. |
| Supply voltage | 3.0 V to 5.5 V operation enables direct compatibility with 3.3 V and 5 V logic systems without level-shifting. |
| Interface speed | 30 MHz max CLK frequency supports fast data loading for large displays-e.g., 16-bit data + 16-bit latch in <1.1 µs. |
| Thermal protection | Overtemperature flag at 150 °C and automatic output shutdown at 170 °C with 15–20 °C hysteresis for safe recovery. |
Pinout & Package
TSSOP24 exposed pad package (RoHS-compliant, moisture sensitivity level 3), thermally enhanced via soldered exposed pad for junction-to-PCB thermal resistance of 37.5 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power ground reference | Common return path for all 16 current sinks and internal logic; must be low-impedance connection to minimize noise coupling. |
| SDI (Pin 2) | Serial data input | Accepts LSB-first 16-bit channel data or register commands on rising CLK edge; requires 5 ns setup/hold timing. |
| CLK (Pin 3) | Serial clock input | Drives internal shift register and command decoding; supports up to 30 MHz with ≤5 µs rise/fall time. |
| LE (Pin 4) | Latch enable | Transfers shift register contents to output latches or initiates register read/write sequences based on pulse count. |
| OUT0–OUT15 (Pins 5–20) | Constant-current outputs | 16 independent N-channel current sinks rated to 20 V; each drives cathode of LED string with programmable TON/TOFF. |
| PWCLK (Pin 21) | PWM clock input | External clock source for PWM counter; internal 500 kΩ pull-up allows direct CMOS connection without external bias. |
| SDO (Pin 22) | Serial data output | Daisy-chain output; propagates shifted-out data with 8–25 ns propagation delay (configurable SDO sync on CLK falling edge). |
| R-EXT (Pin 23) | Current setting reference | Connects external resistor (100 Ω–100 kΩ) to define base current; gain register scales final output in two precision ranges. |
| VDD (Pin 24) | Power supply | 3–5.5 V input powering logic and analog blocks; includes UVLO (2.7 V rise / 2.2 V fall) with 400 mV hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Gradual output delay | Selectable per-channel turn-on sequencing (10 ns inter-channel offset) reduces peak inrush current during display refresh. |
| Auto power saving | Configurable auto-OFF mode cuts supply current to 200–500 µA when outputs idle >100 ns, eliminating external sleep control. |
| Programmable TON/TOFF | Four discrete output rise/fall time options (30–180 ns / 20–150 ns) suppress EMI and improve visual smoothness in PWM dimming. |
| Shorted-LED threshold | Adjustable detection voltage (0.1–0.8 V) enables reliable fault identification across varying LED forward voltages and PCB trace resistances. |
| SDO synchronization | CLK-falling-edge-aligned SDO output ensures deterministic timing in multi-device cascades, preventing data skew in long chains. |
Applications
| Outdoor LED Signage | Indoor Full-Color Video Wall |
|---|---|
|
Use Scenario: Large-format outdoor display panels operating under wide temperature (-40 °C to +85 °C) and variable input voltage conditions. IC Role / Device Role / Timing Role: Primary constant-current driver for red/green/blue LED modules, managing 16-channel brightness and real-time open-circuit fault reporting. Use Value: 20 V output rating supports 5–6 series LEDs per channel; thermal shutdown prevents luminance drift or failure during solar heating. |
Use Scenario: High-resolution indoor video wall with tight pixel pitch and strict EMI limits for commercial environments. IC Role / Device Role / Timing Role: Pixel-level current sink enabling 16-bit grayscale rendering and synchronized PWM dimming across thousands of tiles. Use Value: Programmable TON/TOFF minimizes switching noise; gradual output delay eliminates visible "pop-in" artifacts during frame transitions. |
| Transportation Information Display | Industrial Status Panel |
|
Use Scenario: Rail station or airport departure boards requiring 24/7 reliability, fault logging, and immunity to vibration-induced disconnections. IC Role / Device Role / Timing Role: Fault-aware LED driver performing continuous open/short diagnostics on all 16 outputs during active display operation. Use Value: Configurable shorted-LED threshold detects partial solder joint failures; error status accessible via SDO for centralized monitoring. |
Use Scenario: Factory HMI panel with mixed monochrome indicators (power, alarm, status) needing stable current and long-term calibration retention. IC Role / Device Role / Timing Role: Multi-channel current regulator maintaining ±3% channel matching across temperature and supply variation. Use Value: 7-bit gain register compensates for LED aging or batch variance; auto power saving extends system standby life without firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5947RTQT | 24-channel, 12-bit PWM only, no open/short LED detection, 17 V max output, 3.3 V only supply. | Lacks real-time fault diagnostics and dual-range current gain; suited for lower-voltage, higher-channel-count non-critical displays. | Choose when channel count >16 is required and fault resilience is secondary to cost and footprint. |
| IS31FL3731-QFLS4 | 18-channel, 8×18 matrix architecture, integrated auto-breathing, I²C interface, no R-EXT current programming. | Designed for character/segment displays with built-in animation engine; lacks 20 V drive capability and daisy-chain SPI. | Prefer for alphanumeric or icon-based UIs where embedded effects reduce MCU overhead, not for linear LED strings. |
Compared with TLC5947RTQT and IS31FL3731-QFLS4, the LED1642GWQTR uniquely combines 20 V output headroom, programmable open/short diagnostics, and 12/16-bit PWM flexibility in a 24-pin TSSOP-making it optimal for outdoor signage and industrial panels demanding robust fault handling and wide supply tolerance.
Availability
LED1642GWQTR is available at Aetrix Electronics and suitable for outdoor signage, indoor video walls, transportation information displays, and industrial status panels requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LED1642GWQTR 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 specializing in power management, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.
The LED1642GWQTR belongs to ST's high-reliability LED driver portfolio, engineered specifically for large-area displays where consistent luminance, fault visibility, and thermal resilience are critical design requirements.
FAQ
What is the maximum number of LED1642GWQTR devices that can be daisy-chained?
Up to 16 devices can be cascaded using the SDO-to-SDI connection, limited by total CLK-to-SDO propagation delay accumulation. With CFG-13 = '0', max SDO delay is 25 ns per device; at 30 MHz CLK (33.3 ns period), 16 devices consume ~400 ns of timing margin, remaining within safe setup window for subsequent SDI sampling.
How does the LED1642GWQTR handle open-LED faults during active PWM dimming?
Open-LED detection runs continuously during PWM cycles, triggered when VOUT exceeds the programmed threshold for ≥1 µs. The device flags the fault in its internal register and asserts thermal flag if multiple channels fail simultaneously-enabling real-time correction without interrupting ongoing grayscale updates.
Can the 12/16-bit PWM mode be changed dynamically during operation?
Yes-the PWM counter resolution is selected via CFG-15 bit in the configuration register and can be updated mid-operation via LE-gated serial command. Switching modes causes immediate restart of the PWM counter, resulting in one-frame brightness discontinuity; recommended during display blanking intervals.
What is the role of the R-EXT pin, and how does resistor tolerance affect output accuracy?
R-EXT sets the reference current for all 16 channels; output current = (1.25 V / R-EXT) × gain factor. Using a 1% tolerance resistor yields ±1% base accuracy; combined with ±3% typical gain register error, total worst-case channel current deviation remains within ±4% at full scale.
LED1642GWQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- 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-QFN
LED1642GWQTR FAQ
1.How can I place an order for LED1642GWQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LED1642GWQTR 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 LED1642GWQTR reliable?
The price and inventory of LED1642GWQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LED1642GWQTR is usually 5 days.
3.What payment methods are accepted for LED1642GWQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LED1642GWQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LED1642GWQTR?
LED1642GWQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LED1642GWQTR 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 LED1642GWQTR?
For technical support, including LED1642GWQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LED1642GWQTR requirements.
6.How does Aetrix verify that LED1642GWQTR is sourced from the original manufacturer or authorized distributors?
All LED1642GWQTR 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 LED1642GWQTR meets industry standards.
7.What is the process for return or replacement of LED1642GWQTR?
All LED1642GWQTR units undergo pre-shipment inspection (PSI). If there is an issue with LED1642GWQTR, 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 LED1642GWQTR part is unused and in its original packaging.
Return procedure for LED1642GWQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LED1642GWQTR Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
-
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
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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