My Inquiry
My Account
Texas Instruments TLC6946RGER
- Part No.:
- TLC6946RGER
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
TLC6946RGER.pdf
- Description:
- IC LED DRIVER LINEAR NO 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,672
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLC6946RGER from Texas Instruments is a 16-channel constant-current-sink LED driver IC designed for high-density, fine-pitch LED matrix displays. It delivers 16-bit (65,536-step) enhanced spectrum PWM grayscale control per channel, supports up to 32-multiplexing, and operates with 0.3–25 mA per output across 3–5.5 V VCC. Its integrated 16-Kbit SRAM enables high-refresh-rate video display applications.
For engineers reviewing the TLC6946RGER datasheet, TLC6946RGER pinout, TLC6946RGER application, or TLC6946RGER equivalent, key selection criteria include its 33 MHz max SCLK/GCLK timing, ±1% typical channel-to-channel current matching, LED-open detection (LOD), smart power-save mode (1 mA typical), and dual-edge GCLK support - all critical for mono/full-color LED panel reliability and low-grayscale uniformity.
Technical Context
The TLC6946RGER implements two independent 16-bit × 16-channel × 32-line SRAM banks (BANK A/B) enabling seamless frame buffering: while one bank displays, the other accepts new grayscale data. Its ES-PWM decoder uses GCLK edges to increment internal counters, supporting both single- and dual-edge operation (up to 50 MHz effective rate with 25 MHz input).
Current regulation is set by an external IREF resistor (1.02–10.7 kΩ), establishing maximum sink current per channel; 7-bit global brightness control (BC) then scales all outputs simultaneously in 128 steps (12.5–100.7% gain). Diagnostics include LOD with programmable threshold (0.12–1.28 V), IREF short protection, and thermal shutdown at 170 °C with 15 °C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 5.5 V - powers logic and analog circuitry; supports standard industrial and display supply rails. |
| Output Current Range | 0.3 mA to 25 mA per channel - adjustable via IREF resistor and 7-bit BC register; covers low-power indicators to high-brightness panels. |
| Grayscale Resolution | 16-bit (65,536 steps) per channel - enables smooth dimming and eliminates visible contouring in fine-pitch LED video walls. |
| Max Clock Frequency | 33 MHz for SCLK and GCLK - enables fast data loading and high PWM frame rates (>1 kHz at 32× multiplexing). |
| Current Matching | ±1% typical channel-to-channel deviation - ensures consistent luminance across all 16 outputs without per-channel calibration. |
| Power-Save Current | 1 mA typical - reduces system standby power when all outputs are off; critical for energy-sensitive signage and portable displays. |
| LED-Open Detection | Programmable threshold (4 settings: 0.12–1.28 V) - identifies open-circuit LEDs during operation and reports status via SOUT serial interface. |
Pinout & Package
Package: 24-pin VQFN (RGE) with 4.00 mm × 4.00 mm body and exposed thermal pad internally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GCLK (Pin 20) | Grayscale clock input | Drives internal PWM counter; supports dual-edge operation to double effective clock rate without increasing external frequency. |
| LAT (Pin 1) | Data latch input | Falling edge transfers shift-register data into GS memory or function-control registers; synchronizes frame updates. |
| SCLK (Pin 24) | Serial data-shift clock | Rising edge shifts 16-bit data from SIN into internal shift register; 33 MHz max enables rapid configuration and grayscale loading. |
| SIN (Pin 23) | Serial data input | Accepts 16-bit command or grayscale data; LSB-first protocol allows daisy-chaining multiple TLC6946RGER devices. |
| SOUT (Pin 19) | Serial data output | Outputs MSB of shift register or diagnostic data (e.g., LOD results); enables readback and multi-device cascading. |
| IREF (Pin 21) | Reference current setting | Connects to external resistor (1.02–10.7 kΩ) to set max channel current; short-protection triggers if voltage drops below 0.15 V. |
| OUT0–OUT15 (Pins 2–9, 11–18) | Constant-current sink outputs | 16 individually PWM-controlled outputs; each sinks up to 25 mA with 0.3 V typical knee voltage at 10 mA - minimizes power loss in high-current LED strings. |
| VCC (Pin 22) | Supply voltage | Primary power for logic and analog blocks; decoupling near pin is required for stable high-speed operation. |
| GND (Pin 10) | Ground reference | Common return for all currents; thermal pad must be soldered to PCB ground plane for thermal management (RθJB = 15.2 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| 16-Kbit integrated SRAM | Enables 32-multiplexing with zero host CPU intervention between frames - essential for flicker-free, high-refresh-rate LED video panels. |
| Low-grayscale enhancement | Eliminates coupling, ghosting, and caterpillar artifacts in sub-10% brightness regions - directly improves visual quality in dark scenes. |
| Dual-edge GCLK operation | Allows 25 MHz external clock to achieve 50 MHz internal PWM timing - reduces EMI and simplifies clock generation circuitry. |
| Smart power-save mode | Reduces ICC to 1 mA typical when all outputs are off - extends battery life in portable signage and lowers thermal load in enclosed enclosures. |
| Programmable LOD threshold | Four selectable voltage thresholds (0.12–1.28 V) let designers optimize open-LED detection sensitivity for varying LED forward voltages and string configurations. |
Applications
| Indoor Full-Color LED Video Wall | High-Density Outdoor Billboard |
|---|---|
|
Use Scenario: 4 mm pitch RGB LED modules driven in 16×2 configuration with 32-multiplexing for 3840 Hz refresh rate. IC Role / Device Role / Timing Role: TLC6946RGER acts as per-module grayscale controller, receiving serialized GS data over SCLK/SIN and latching it on LAT falling edge; GCLK drives 16-bit PWM counters for precise brightness control. Use Value: 16-bit resolution prevents contouring; ±1% current matching ensures uniform white balance; LOD detects failed LEDs before visible pixel defects occur. |
Use Scenario: 10 mm pitch monochrome signage using 16-LED-per-string configuration with thermal derating at 60 °C ambient. IC Role / Device Role / Timing Role: TLC6946RGER serves as constant-current sink for each string segment; IREF resistor sets 20 mA max, and BC register adjusts for daylight visibility. Use Value: 0.3 V knee voltage minimizes power dissipation at high current; thermal shutdown (170 °C) protects against enclosure overheating; smart power-save cuts idle consumption by >90%. |
| Stage Lighting Pixel Controller | Transportation Information Display |
|
Use Scenario: DMX-controlled RGBW fixtures requiring smooth 16-bit dimming transitions and real-time fault reporting. IC Role / Device Role / Timing Role: TLC6946RGER receives grayscale commands via microcontroller UART-to-SPI bridge; SOUT returns LOD status after each LAT pulse for diagnostics. Use Value: Dual-edge GCLK enables 1000+ Hz PWM without exceeding 25 MHz clock routing limits; programmable LOD thresholds adapt to aging LED Vf drift over 50,000-hour lifetime. |
Use Scenario: Bus destination signs operating 24/7 with strict MTBF requirements and remote firmware updates. IC Role / Device Role / Timing Role: TLC6946RGER manages 16-segment alphanumeric characters; built-in SRAM stores full frame data, allowing host MCU to sleep between content changes. Use Value: 16-Kbit memory eliminates continuous data streaming; IREF short protection prevents catastrophic failure from solder-joint fatigue; RGE package supports automated optical inspection (AOI). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC6948RGER | 24-Kbit SRAM supports 48-multiplexing vs TLC6946RGER's 16-Kbit/32-mux; identical pinout, same I/O timing and current specs. | Required for higher-resolution panels needing >32× multiplexing (e.g., 2.5 mm pitch indoor displays). | Select TLC6948RGER only when 48-line memory depth is needed; otherwise TLC6946RGER offers lower cost and equal performance for ≤32-mux designs. |
| MAX7219CWG+ | 8-channel, 8-bit PWM, no built-in memory; requires continuous host data streaming; lacks LOD, dual-edge GCLK, and low-grayscale enhancement. | Suitable for simple 7-segment or low-resolution dot-matrix displays where cost and simplicity outweigh grayscale fidelity. | Choose MAX7219CWG+ for legacy 8×8 LED arrays with basic brightness control; avoid for fine-pitch video applications requiring artifact-free low-grayscale rendering. |
Compared with TLC6948RGER, the TLC6946RGER provides identical functionality at lower memory cost for 32-mux systems, while MAX7219CWG+ lacks critical features like per-channel 16-bit PWM, integrated memory, and display-quality enhancements - making it unsuitable for high-fidelity LED video applications.
Availability
TLC6946RGER is available at Aetrix Electronics and suitable for indoor LED video walls, outdoor digital billboards, stage lighting pixel controllers, and transportation information displays requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TLC6946RGER 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and consumer applications.
The TLC6946RGER belongs to TI's LED display driver product line, engineered specifically for high-refresh-rate, fine-pitch LED matrix panels demanding precision grayscale control, low-grayscale artifact suppression, and robust diagnostics.
FAQ
What is the maximum multiplexing capability supported by the TLC6946RGER?
The TLC6946RGER supports up to 32-multiplexing, enabled by its integrated 16-Kbit SRAM organized as two 16-bit × 16-channel × 32-line banks. This architecture allows one bank to display while the other receives new frame data, eliminating visible flicker and reducing host processor bandwidth requirements. The TLC6946RGER does not support 48-multiplexing - that capability is exclusive to the TLC6948RGER variant.
How does the TLC6946RGER implement LED-open detection (LOD)?
The TLC6946RGER monitors voltage at each OUTn pin during active drive periods. When an LED opens, the output voltage rises above a programmable threshold (0.12–1.28 V, selected via function control register bits LODVTH[1:0]). Detected faults are stored in a 16-bit LOD data register and can be read back via the SOUT pin after issuing a READLOD command through the serial interface - enabling real-time panel health monitoring without external sensors.
Can the TLC6946RGER operate with dual-edge GCLK, and what is the benefit?
Yes, the TLC6946RGER supports dual-edge GCLK operation when the GCLK_EDGE bit in the function control register is set to 1. This allows both rising and falling edges of the external GCLK signal to increment the internal PWM counter, effectively doubling the grayscale update rate. With a 25 MHz external clock, the device achieves 50 MHz internal timing - improving PWM resolution at high refresh rates while easing PCB layout constraints and reducing EMI compared to single-edge 33 MHz operation.
What is the role of the IREF pin, and how is the output current set on the TLC6946RGER?
The IREF pin on the TLC6946RGER connects to an external resistor (RIREF) between IREF and GND, establishing the reference voltage (~0.8 V) that sets the maximum sink current per channel. The actual output current is calculated as IOUT = (0.8 V / RIREF) × Gain, where Gain depends on the 7-bit global brightness control (BC) setting (e.g., Gain = 32 at BC = 7Eh). RIREF values from 1.02 kΩ (25 mA max) to 10.7 kΩ (0.3 mA max) ensure stable operation across the full current range.
Does the TLC6946RGER require external memory for frame storage?
No, the TLC6946RGER integrates 16 Kbits of on-chip SRAM, eliminating the need for external memory. This memory is partitioned into two independent banks (BANK A and BANK B), each capable of storing full 16-channel × 32-line grayscale data. While one bank displays the current frame, the other accepts updated data - enabling seamless, flicker-free operation and reducing system-level complexity and BOM cost.
TLC6946RGER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 0V ~ 5.5V
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- No
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
TLC6946RGER FAQ
1.How can I place an order for TLC6946RGER through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC6946RGER 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 TLC6946RGER reliable?
The price and inventory of TLC6946RGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC6946RGER is usually 5 days.
3.What payment methods are accepted for TLC6946RGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC6946RGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC6946RGER?
TLC6946RGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC6946RGER 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 TLC6946RGER?
For technical support, including TLC6946RGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC6946RGER requirements.
6.How does Aetrix verify that TLC6946RGER is sourced from the original manufacturer or authorized distributors?
All TLC6946RGER 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 TLC6946RGER meets industry standards.
7.What is the process for return or replacement of TLC6946RGER?
All TLC6946RGER units undergo pre-shipment inspection (PSI). If there is an issue with TLC6946RGER, 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 TLC6946RGER part is unused and in its original packaging.
Return procedure for TLC6946RGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC6946RGER Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
