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STMicroelectronics LED1642GWXTTR
- Part No.:
- LED1642GWXTTR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LED1642GWXTTR.pdf
- Description:
- IC LED DRVR LIN PWM 40MA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,181
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Product details
Overview
LED1642GWXTTR 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.
For engineers reviewing the LED1642GWXTTR datasheet, LED1642GWXTTR pinout, LED1642GWXTTR application, or LED1642GWXTTR equivalent, key selection criteria include channel count, open/short LED diagnostic capability, programmable TON/TOFF timing, thermal shutdown at 170 °C, and daisy-chain SDO synchronization support.
Technical Context
The LED1642GWXTTR integrates a 16-bit shift register, 16 independent current-regulated output drivers, and a configurable PWM counter with 12/16-bit resolution. Its digital control logic uses LE-gated clocked serial interface with up to 30 MHz CLK frequency and supports configuration register readback via SDO with selectable delay.
It implements dual-range 7-bit current gain adjustment (CFG-0 to CFG-5 + CFG-6), programmable shorted-LED detection thresholds, auto power-down/wakeup triggered by LE edge, and gradual output delay (CFG-14) to limit inrush current-enabling robust operation in cascaded LED matrix systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 16 constant-current sinks, each independently controllable for brightness and on/off state |
| Output current range | 3 mA to 40 mA per channel, set by external REXT (100 Ω–100 kΩ) and 7-bit gain register |
| PWM resolution | Selectable 12-bit (4096 steps) or 16-bit (65536 steps) grayscale control per channel |
| Output voltage rating | 20 V max per channel-supports up to 6 white LEDs (3.2 V each) in series under typical conditions |
| Error detection | Detects both open-circuit and shorted-LED faults with programmable thresholds and dedicated flag reporting |
| Thermal protection | Overtemperature alert at 150 °C; automatic output shutdown at 170 °C with 15–20 °C hysteresis |
| Interface speed | 30 MHz 4-wire serial interface (SDI, CLK, LE, SDO); supports daisy-chaining with SDO sync on CLK falling edge |
Pinout & Package
TSSOP24 (exposed pad) package: 24-pin thermally enhanced thin shrink small outline package with exposed thermal pad soldered to PCB ground plane for optimal thermal dissipation (Rthj-amb = 37.5 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal circuits and output current sinks; must be low-impedance connection |
| SDI (Pin 2) | Serial data input | Accepts 30 MHz SPI-compatible data stream on CLK rising edge; LSB-first, 16-bit channel data + config bits |
| CLK (Pin 3) | Serial clock input | Drives internal shift register and PWM counter; max 30 MHz; rise/fall time ≤5 µs for cascade reliability |
| LE (Pin 4) | Latch enable | Edge-triggered strobe that latches shift register contents into output registers or initiates config read/write |
| OUT0–OUT15 (Pins 5–20) | Constant-current outputs | 16 individually controlled current sinks; each rated for 20 V compliance and 50 mA absolute max |
| PWCLK (Pin 21) | PWM clock input | External clock source for PWM counter; internal 500 kΩ pull-up enables free-running mode when left floating |
| SDO (Pin 22) | Serial data output | Configurable daisy-chain output; synchronized to CLK falling edge when CFG-13 = 1; supports readback of status/error flags |
| R-EXT (Pin 23) | Current setting resistor terminal | Connects external resistor (100 Ω–100 kΩ) to set base current; precision depends on resistor tolerance and layout |
| VDD (Pin 24) | Supply voltage | 3.0–5.5 V input; includes UVLO (2.7 V rise / 2.2 V fall) and internal regulation for analog/digital blocks |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output transition timing | Four selectable TON/TOFF combinations (30–180 ns rise, 20–150 ns fall) reduce EMI and inrush stress on LED strings |
| Gradual output delay | Channel-to-channel staggered turn-on (10 µs step) minimizes peak supply current in high-density displays |
| Auto power management | Configurable auto-shutdown (≤100 ns response) and auto-wakeup (≤3 µs) eliminate need for external power sequencing |
| Dual-range current gain | 7-bit gain register with CFG-6 selecting low/high current subranges improves resolution and accuracy across full 3–40 mA span |
| Open/short LED diagnostics | Dedicated error detection mode reports fault type and channel index via SDO; thresholds programmable per application |
Applications
| Outdoor LED Signage | Architectural Lighting Panels |
|---|---|
|
Use Scenario: High-brightness monochrome or RGB LED modules mounted on building façades, subject to wide ambient temperature swings and long cable runs. IC Role / Device Role / Timing Role: Constant-current sink driver with open/short detection ensures pixel-level reliability; 20 V output rating accommodates series-connected LEDs over variable forward voltage drops. Use Value: Eliminates need for per-string current regulators; built-in thermal shutdown prevents luminance drift or failure during summer operation. |
Use Scenario: Large-format indoor lighting panels using uniform white LED arrays requiring precise grayscale matching and low-noise dimming. IC Role / Device Role / Timing Role: 16-bit PWM grayscale controller with programmable TON/TOFF ensures flicker-free dimming down to 0.001% brightness without visible stepping. Use Value: Gradual output delay reduces peak inrush current by >60%, enabling use with shared 5 V rail and smaller bulk capacitors. |
| Transportation Display Systems | Industrial HMI Status Indicators |
|
Use Scenario: Train station departure boards and bus destination signs operating 24/7 in uncontrolled environments with frequent power cycling. IC Role / Device Role / Timing Role: Auto power-save/wakeup feature responds to LE signal edges to enter low-IDD (200 µA) state between updates-reducing average power by >95%. Use Value: Enables battery-backed or energy-harvested operation; thermal flag reporting allows predictive maintenance before luminance degradation occurs. |
Use Scenario: Factory-floor operator interfaces where LED indicators must survive vibration, ESD events, and occasional wiring faults. IC Role / Device Role / Timing Role: Real-time open/short LED detection with configurable thresholds identifies failed indicators before system-level alarms trigger. Use Value: Reduces mean time to repair (MTTR) by localizing faults to specific channel; SDO daisy-chain simplifies wiring in multi-segment indicator stacks. |
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 |
|---|---|---|---|
| TLC5947 (Texas Instruments) | 24-channel, 12-bit PWM only; no open/short detection; 17 V output rating; requires external VREF | Better suited for high-channel-count, lower-voltage (<15 V) RGB LED strips without fault monitoring needs | Choose if scaling beyond 16 channels is required and diagnostic capability is secondary |
| IS31FL3731 (Lumissil) | 18-channel, 8×8 matrix driver; integrated I²C interface; no R-EXT programming; 36 mA max per channel | Optimized for compact grid-based displays (e.g., icons, status matrices); lacks daisy-chain serial interface | Prefer for space-constrained designs needing I²C simplicity and built-in frame buffer |
Compared with TLC5947 and IS31FL3731, the LED1642GWXTTR uniquely combines 20 V output compliance, open/short LED diagnostics, and daisy-chain SDO synchronization-making it the only option among the three qualified for outdoor signage with long LED strings and field-replaceable module monitoring.
Availability
LED1642GWXTTR is available at Aetrix Electronics and suitable for outdoor signage, architectural lighting panels, transportation display systems, and industrial HMI status indicators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LED1642GWXTTR 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 technologies for industrial, automotive, and consumer markets.
The LED1642GWXTTR belongs to ST's high-reliability LED driver product line, engineered specifically for large-area, mission-critical visual displays where channel accuracy, fault resilience, and thermal robustness are non-negotiable.
FAQ
What is the maximum number of LED1642GWXTTR devices that can be daisy-chained?
Up to 16 devices can be daisy-chained using the SDO output and SDI input, limited by cumulative propagation delay and signal integrity at 30 MHz. Each device adds ~25 ns CLK-to-SDO delay (CFG-13 = 0), so total chain delay must remain within setup/hold timing margins of the master controller. Layout with controlled impedance traces and proper termination is essential beyond 8 devices.
How does the 7-bit current gain register interact with the external R-EXT resistor?
The 7-bit gain register (CFG-0 to CFG-5 + CFG-6) scales the base current set by R-EXT in two subranges: low range (CFG-6 = 0) gives finer resolution near 3–20 mA, high range (CFG-6 = 1) extends full-scale to 40 mA. For R-EXT = 11 kΩ, gain steps range from ±4% to ±3% channel-to-channel error depending on selected subrange and output voltage.
Can the LED1642GWXTTR drive common-anode LED configurations?
No-the LED1642GWXTTR provides only constant-current sink outputs (OUT0–OUT15) and requires LEDs to be wired in common-anode topology: anode tied to a positive rail (≤20 V), cathode connected to OUTx. It cannot source current or drive common-cathode arrays without external high-side switches.
What happens during UVLO condition and how does it affect latch behavior?
When VDD falls below 2.2 V (UVLO falling threshold), the device disables all outputs, clears internal registers, and enters reset state-ignoring SDI, CLK, and LE inputs until VDD rises above 2.7 V. Latch operations (LE assertions) are无效 during UVLO; no data is latched or shifted, preventing partial register writes during brown-out conditions.
LED1642GWXTTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LED1642GWXTTR FAQ
1.How can I place an order for LED1642GWXTTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LED1642GWXTTR 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 LED1642GWXTTR reliable?
The price and inventory of LED1642GWXTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LED1642GWXTTR is usually 5 days.
3.What payment methods are accepted for LED1642GWXTTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LED1642GWXTTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LED1642GWXTTR?
LED1642GWXTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LED1642GWXTTR 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 LED1642GWXTTR?
For technical support, including LED1642GWXTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LED1642GWXTTR requirements.
6.How does Aetrix verify that LED1642GWXTTR is sourced from the original manufacturer or authorized distributors?
All LED1642GWXTTR 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 LED1642GWXTTR meets industry standards.
7.What is the process for return or replacement of LED1642GWXTTR?
All LED1642GWXTTR units undergo pre-shipment inspection (PSI). If there is an issue with LED1642GWXTTR, 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 LED1642GWXTTR part is unused and in its original packaging.
Return procedure for LED1642GWXTTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LED1642GWXTTR Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
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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