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Texas Instruments TLC5940RHBR
- Part No.:
- TLC5940RHBR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TLC5940RHBR.pdf
- Description:
- IC LED DRVR LINEAR 120MA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,292
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Product details
Overview
TLC5940RHBR from Texas Instruments is a 16-channel constant-current LED sink driver with 12-bit (4096-step) grayscale PWM control, 6-bit dot correction stored in integrated EEPROM, and simultaneous LED open detection (LOD) and thermal error flag (TEF). It supports up to 120 mA per channel (VCC > 3.6 V), operates from 3 V to 5.5 V, and drives LED loads up to 17 V - used in full-color LED displays requiring precise per-channel brightness calibration.
For engineers reviewing the TLC5940RHBR datasheet, TLC5940RHBR pinout, TLC5940RHBR application, or TLC5940RHBR equivalent, key selection criteria include its serial 3-wire interface (SIN/SCLK/XLAT), 30 MHz data rate, open-drain XERR error reporting, programmable current via IREF resistor, and cascading capability via SOUT-to-SIN daisy-chaining for large display matrices.
Technical Context
The TLC5940RHBR implements dual independent register sets: a 96-bit grayscale (GS) register for PWM timing control and a 96-bit dot correction (DC) register for per-channel current trimming. GS data is latched on XLAT high, while DC data requires VPRG = VCC and DCPRG = HIGH for EEPROM programming. Both registers feed into 16 identical constant-current sinks with graduated 20-ns inter-channel delays to suppress inrush current.
Its error architecture integrates LOD and TEF onto a single open-drain XERR output, with LOD maskable via BLANK = HIGH. Status bits (LOD/TEF/DC data ready) are readable via SOUT during serial readback cycles. The device uses CMOS-level I/O, supports 30 MHz SCLK/GSCLK, and features thermal shutdown at ~160°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 16 independent constant-current sink outputs (OUT0–OUT15) |
| Grayscale resolution | 12-bit (4096 steps) PWM control per channel - enables smooth visual intensity gradation |
| Dot correction resolution | 6-bit (64 steps) per channel, stored in on-chip EEPROM - corrects LED-to-LED and board-level current variance |
| Max output current | 120 mA per channel (VCC > 3.6 V); set by external IREF resistor - supports high-brightness LEDs without external drivers |
| LED supply voltage | Up to 17 V at OUTn pins - allows direct drive of multi-LED strings in signage and backlighting |
| Error detection | Integrated LOD (open-LED detection at <0.3 V) and TEF (thermal flag at ~160°C) - reduces system-level fault monitoring overhead |
| Serial interface speed | 30 MHz SCLK and GSCLK - enables fast refresh of large LED arrays (e.g., 192-bit load in ≤6.4 µs) |
Pinout & Package
RHB package: 32-pin VQFN (5.0 mm × 5.0 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad. Pin 1 marked via top-side dot; pin 32 = XLAT; thermal pad must be soldered to PCB ground plane for thermal compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT15 | Constant-current sink outputs | Each delivers programmable current (0–120 mA) to cathode of connected LED; voltage-tolerant to 17 V |
| SIN | Serial data input | MSB-first 96-bit (GS) or 192-bit (GS + DC) data stream; CMOS-compatible, 0.2VCC–0.8VCC thresholds |
| SCLK | Serial clock input | Edge-triggered shift clock (max 30 MHz); rising edge loads SIN bit into internal shift register |
| XLAT | Latch control input | Level-triggered; high pulse transfers shift register contents to GS or DC register (mode selected by VPRG) |
| GSCLK | Grayscale PWM clock | Drives internal 12-bit counter; frequency determines PWM period (e.g., 1 MHz → 4.096 ms full cycle) |
| BLANK | Global output disable | Active-high; forces all OUTn OFF and resets GS counter - used for flicker-free blanking or PWM dimming |
| IREF | Current reference input | Connects to external resistor; sets max channel current: IOUT = 31.5 × VIREF/RIREF (VIREF = 1.24 V typ) |
| VPRG | Mode select & EEPROM programming | GND = GS mode; VCC = DC mode; 20–23 V = enable DC EEPROM write (with DCPRG = HIGH) |
| DCPRG | DC register/EEPROM switch | LOW = connect DC register to EEPROM; HIGH = connect DC register to shift register - controls data path during programming |
| XERR | Open-drain error output | Asserts LOW on LOD or TEF; requires external pull-up; multiple devices can share single interrupt line |
| SOUT | Serial data output | Shifts out status bits (LOD/TEF/DC ready) or cascades to next TLC5940 SIN - enables daisy-chained fault reporting |
| GND / VCC | Power supply terminals | VCC = 3–5.5 V; GND = logic and power return; thermal pad tied to GND for RθJB = 8.5°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Graduated output delay | 20 ns step between adjacent channels (0–300 ns total), reducing peak inrush current and easing bypass capacitor sizing |
| Integrated EEPROM storage | Nonvolatile 6-bit dot correction data per channel - eliminates factory calibration reprogramming after power cycle |
| Cascadable serial interface | Single SOUT-to-SIN connection enables unlimited channel expansion without additional MCU GPIOs |
| Programmable current limit | One external resistor (IREF) sets identical max current across all 16 channels - simplifies BOM and layout |
| LED open detection | Detects open-circuit LEDs during active drive (OUTn ON + VOUT < 0.3 V) - prevents undriven segments in critical signage |
| Thermal error flag | Junction temperature threshold ~160°C; latched status readable via SOUT - enables graceful thermal derating in enclosed fixtures |
Applications
| Monocolor LED Signboards | Full-Color Video Displays |
|---|---|
Use Scenario: Outdoor alphanumeric signboards using high-brightness red/green/blue LED modules with variable ambient lighting. IC Role / Device Role / Timing Role: TLC5940RHBR acts as column driver in multiplexed matrix, delivering calibrated per-LED current and grayscale timing synchronized to row scan. Use Value: Dot correction compensates for LED binning variance across 10,000+ LEDs; 12-bit PWM ensures flicker-free 256-level brightness control under sunlight. |
Use Scenario: Indoor rental LED video walls (P2.5–P4 pitch) requiring seamless color uniformity and hot-swap reliability. IC Role / Device Role / Timing Role: TLC5940RHBR serves as per-module constant-current sink, receiving serialized GS/DC data from FPGA-based controller over daisy-chained SOUT/SIN. Use Value: Cascading support enables 256×128 pixel tiles with single controller interface; LOD detection triggers automatic module replacement alerts. |
| Automotive Interior Lighting | Industrial HMI Backlighting |
Use Scenario: RGB ambient lighting strips in vehicle cabins with CAN-controlled dimming profiles and thermal monitoring. IC Role / Device Role / Timing Role: TLC5940RHBR drives individual RGB LED strings per zone; TEF signal feeds into vehicle ECU for thermal derating. Use Value: 17 V output capability supports long LED strings; BLANK pin enables synchronized PWM dimming aligned to vehicle bus timing. |
Use Scenario: Operator panel backlights in factory HMIs exposed to wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: TLC5940RHBR provides stable current sink for white LED arrays; EEPROM-stored dot correction maintains luminance uniformity across life cycle. Use Value: ±4% channel current error over temperature ensures consistent backlight intensity; GND-referenced IREF simplifies current sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC5941RHBR | Pin-compatible upgrade with 16-bit grayscale (65,536 steps), same 6-bit dot correction and EEPROM; adds auto-blanking and improved ESD (±4 kV HBM) | Required where >4096 grayscale levels are needed for HDR video or medical imaging displays | Select TLC5941RHBR when higher grayscale resolution and robustness justify cost premium; retains identical layout and firmware interface |
| IS31FL3728-QFLS4-TR | 28-channel, I²C interface, no EEPROM, 12-bit grayscale only (no dot correction), max 40 mA/channel, 3.3 V only | Suitable for low-cost consumer panels where per-channel calibration is handled externally or not required | Choose IS31FL3728-QFLS4-TR for space-constrained I²C systems with <40 mA/channel needs; avoid where LED binning compensation is critical |
Compared with TLC5940RHBR, TLC5941RHBR delivers higher grayscale fidelity and field-proven thermal resilience, while IS31FL3728-QFLS4-TR trades dot correction and voltage flexibility for integration simplicity and lower unit cost in non-critical lighting.
Availability
TLC5940RHBR is available at Aetrix Electronics and suitable for monocolor LED signboards, full-color video displays, and automotive interior lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial-grade production.
Supply support for TLC5940RHBR 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 communications markets.
The TLC5940RHBR belongs to TI's LED driver product line, designed specifically for high-precision, high-channel-count LED matrix control with integrated calibration and fault diagnostics - targeting signage, stage lighting, and automotive ambient systems.
FAQ
What is the maximum output current per channel for the TLC5940RHBR?
The TLC5940RHBR supports up to 120 mA per channel when VCC exceeds 3.6 V, set precisely by an external resistor on the IREF pin. At VCC < 3.6 V, the limit drops to 60 mA. This current is constant and sink-type, enabling direct connection to LED cathodes. The TLC5940RHBR's current accuracy remains within ±4% across temperature and device variation, ensuring consistent brightness in multi-unit deployments.
How does dot correction work in the TLC5940RHBR, and where is the data stored?
The TLC5940RHBR implements 6-bit dot correction (64 steps) per channel to compensate for LED forward-voltage variations and PCB trace resistance differences. Correction values are written to an integrated EEPROM using VPRG = 20–23 V and DCPRG = HIGH. Once programmed, the EEPROM retains data across power cycles, eliminating recalibration. The TLC5940RHBR applies correction multiplicatively to the grayscale PWM duty cycle, ensuring uniform luminance without external microcontroller intervention.
Can multiple TLC5940RHBR devices be connected together, and how is data routed?
Yes - the TLC5940RHBR supports daisy-chained operation via its SOUT and SIN pins. Serial data (96 or 192 bits) shifts into the first device's SIN, then propagates through SOUT to the next SIN, and so on. A single SCLK and XLAT control all devices simultaneously. For example, two TLC5940RHBRs accept 192-bit GS + 192-bit DC data in one sequence. This architecture scales to hundreds of channels with minimal MCU GPIO usage and deterministic timing.
What happens when the XERR pin asserts low on the TLC5940RHBR?
The XERR pin on the TLC5940RHBR goes low (open-drain active) when either LED open detection (LOD) or thermal error flag (TEF) is triggered. LOD activates if an output is enabled but its voltage falls below 0.3 V (indicating open circuit), while TEF triggers above ~160°C junction temperature. Since XERR is shared, designers must read the internal status register via SOUT after pulsing XLAT to determine which error occurred - the TLC5940RHBR does not distinguish them electrically on XERR alone.
What is the purpose of the BLANK pin on the TLC5940RHBR, and how does it interact with grayscale timing?
The BLANK pin on the TLC5940RHBR globally disables all 16 outputs when driven high, forcing OUTn to high-impedance and resetting the internal grayscale counter. Critically, BLANK overrides all PWM state - even mid-cycle - enabling flicker-free frame blanking or hardware-level dimming. When BLANK returns low, grayscale counting resumes from zero. This behavior allows precise synchronization with external video timing signals, making the TLC5940RHBR suitable for real-time display updates without software latency.
TLC5940RHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-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:
- 17V
- Current - Output / Channel:
- 120mA
- Frequency:
- 30MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TLC5940RHBR FAQ
1.How can I place an order for TLC5940RHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC5940RHBR 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 TLC5940RHBR reliable?
The price and inventory of TLC5940RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC5940RHBR is usually 5 days.
3.What payment methods are accepted for TLC5940RHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC5940RHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC5940RHBR?
TLC5940RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC5940RHBR 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 TLC5940RHBR?
For technical support, including TLC5940RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC5940RHBR requirements.
6.How does Aetrix verify that TLC5940RHBR is sourced from the original manufacturer or authorized distributors?
All TLC5940RHBR 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 TLC5940RHBR meets industry standards.
7.What is the process for return or replacement of TLC5940RHBR?
All TLC5940RHBR units undergo pre-shipment inspection (PSI). If there is an issue with TLC5940RHBR, 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 TLC5940RHBR part is unused and in its original packaging.
Return procedure for TLC5940RHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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