TLC5940
16-Channel LED DriverThe TLC5940 is a 16-channel led driver from Texas Instruments. View the full TLC5940 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Official TLC5940 datasheet (PDF) — the source this page was extracted from.
Manufacturer
Texas InstrumentsCategory
LEDsTLC5940 Key Specifications
| Parameter | Value |
|---|---|
| Channels | 16 |
| ESD (HBM) | ±2000 V |
| Interface | Serial data interface, CMOS level I/O |
| Error Detection | LED open detection (LOD), thermal error flag (TEF) |
| Data Transfer Rate | 30 MHz |
| EEPROM Write Cycles | 50 |
| Storage Temperature | -55 °C to 150 °C |
| Supply Voltage (VCC) | 3 V to 5.5 V |
| Grayscale PWM Resolution | 12 bit (4096 steps) |
| Dot Correction Resolution | 6 bit (64 steps) |
| LED Supply / Output Voltage | up to 17 V |
| Absolute Max Output Current (Dc) | 130 mA |
| Constant Output Current (VCC < 3.6 V) | 0 mA to 60 mA |
| Constant Output Current (VCC > 3.6 V) | 0 mA to 120 mA |
TLC5940 Overview
Part: TLC5940 — Texas Instruments
Type: 16-Channel Constant-Current Sink LED Driver
Description: 16-channel LED driver with 12-bit (4096-step) grayscale PWM, 6-bit (64-step) EEPROM-storable dot correction, up to 120 mA per channel (VCC > 3.6 V), 3–5.5 V supply and 17 V LED supply capability.
Operating Conditions:
- Supply voltage (VCC): 3–5.5 V
- Operating temperature: -40 to 85 °C
- Output voltage (OUT0–OUT15): up to 17 V
- Constant output current: up to 60 mA (VCC < 3.6 V) or 120 mA (VCC > 3.6 V)
- SCLK and GSCLK frequency: up to 30 MHz
Absolute Maximum Ratings:
- Max supply voltage (VCC): 6 V
- Output voltage (OUT0–OUT15): 18 V
- Output current (dc): 130 mA
- EEPROM program voltage (VPRG): 24 V
- EEPROM write cycles: 50
- Storage temperature: -55 to 150 °C
Key Specs:
- Constant sink current: 61 mA typ (54–69 mA), all outputs ON, VO = 1 V, R(IREF) = 640 Ω
- Channel-to-channel current error: ±1% typ, ±4% max (R(IREF) = 640 Ω, VO = 1 V)
- Device-to-device current error: ±4% max (R(IREF) = 1920 Ω or 480 Ω)
- Line regulation: ±1 %/V typ, ±4 %/V max (R(IREF) = 640 Ω)
- Load regulation: ±2 %/V typ, ±6 %/V max (VO = 1–3 V, R(IREF) = 640 Ω)
- Supply current: 0.9 mA typ, 6 mA max (outputs OFF, R(IREF) = 10 kΩ); 30 mA typ, 60 mA max (30 MHz data transfer, outputs ON, R(IREF) = 640 Ω)
- Reference voltage V(IREF): 1.24 V typ (1.20–1.28 V) at R(IREF) = 640 Ω
- Thermal error flag threshold: 150–170 °C junction temperature
- LED open detection threshold: 0.3 V typ, 0.4 V max
- Output leakage: 0.1 μA max (outputs OFF, VO = 15 V)
Features:
- 16 channels with 12-bit grayscale PWM control
- 6-bit dot correction, storable in integrated EEPROM
- Maximum current of all channels set by a single external resistor
- Controlled in-rush current
- 30 MHz serial data interface with CMOS-level I/O
- LED open detection (LOD) and thermal error flag (TEF), reported on open-drain XERR output
Applications:
- Monocolor, multicolor and full-color LED displays
- LED signboards
- Display backlighting
- General high-current LED drive
Package:
- PDIP (28): 35.69 mm × 6.73 mm
- HTSSOP (28) (PWP): 9.70 mm × 4.40 mm
- VQFN (32) (RHB): 5.00 mm × 5.00 mm
TLC5940 Applications
- Monocolor, Multicolor, Full-Color LED Displays
- LED Signboards
- Display Backlighting
- General, High-Current LED Drive
The TLC5940 is a 16-channel, constant-current sink LED driver. Each channel has an individually adjustable 4096-step grayscale PWM brightness control and a 64-step, constant-current sink (dot correction). The dot correction adjusts the brightness variations between LED channels and other LED drivers. The dot correction data is stored in an integrated EEPROM. Both grayscale control and dot correction are accessible through a serial interface. A single external resistor sets the maximum current value of all 16 channels.
The TLC5940 features two error information circuits. The LED open detection (LOD) indicates a broken or disconnected LED at an output terminal. The thermal error flag (TEF) indicates an overtemperature condition.
TLC5940 Pin Configuration
NC - No internal connection
TLC5940 Electrical Characteristics
VCC = 3 V to 5.5 V, TA = -40°C to 85°C (unless otherwise noted)
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| V OH | High-level output voltage | I OH = -1 mA, SOUT | V CC -0.5 | V | ||
| V OL | Low-level output voltage | I OL = 1 mA, SOUT V I = V CC or GND; BLANK, DCPRG, GSCLK, SCLK, SIN, XLAT | -1 | 0.5 1 | V | |
| I I | Input current | V I = GND; VPRG V I = V CC ; VPRG | -1 | 1 50 | μ A | |
| V I = 22 V; VPRG; DCPRG = V CC No data transfer, all output OFF, V O = 1 V, R (IREF) = 10 k Ω No data transfer, all output OFF, V O = 1 V, R (IREF) = 1.3 k Ω | 4 0.9 5.2 | 10 6 12 | mA | |||
| I CC | Supply current | Data transfer 30MHz, all output ON, V O = 1 V, R (IREF) = 1.3 k Ω Data transfer 30MHz, all output ON, V O = 1 V, R (IREF) = 640 Ω | 16 30 | 25 60 | mA | |
| I O(LC) | Constant sink current (see Figure 10) | All output ON, V O = 1 V, R (IREF) = 640 Ω | 54 | 61 | 69 | mA |
| I lkg | Leakage output current | All output OFF, V O = 15 V, R (IREF) = 640 Ω , OUT0 to OUT15 All output ON, V O = 1 V, R (IREF) = 640 Ω , OUT0 to OUT15, -20°C to 85°C | ±1% | 0.1 ±4% | μ A | |
| Constant sink current error | All output ON, V O = 1V, R (IREF) = 640 Ω , OUT0 to OUT15 (1) | ±1% | ±8% | |||
| Δ I O(LC0) | (see Figure 10) | All output ON, V O = 1V, R (IREF) = 320 Ω , OUT0 to OUT15, -20°C to 85°C All output ON, V O = 1V, R (IREF) = 320 Ω , V CC = 4.5 V to 5.5 V, OUT0 to OUT15 (1) | ±1% ±1% | ±6% ±8% | ||
| Δ I O(LC1) | Constant sink current error (see Figure 10) | Device to device, Averaged current from OUT0 to OUT15, R (IREF) = 1920 Ω (20 mA) (2) | -2% +0.4% | ±4% | ||
| Δ I O(LC2) | Constant sink current error (see Figure 10) | Device to device, Averaged current from OUT0 to OUT15, R (IREF) = 480 Ω (80 mA) (2) | -2.7% +2% | ±4% | ||
| All output ON, V O = 1V, R (IREF) = 640 Ω OUT0 to OUT15, V CC = 3 V to 5.5 V (3) | ±1 | ±4 | %/V | |||
| Δ I O(LC3) | Line regulation (see Figure 10) | All output ON, V O = 1V, R (IREF) = 320 Ω , OUT0 to OUT15, V CC = 3 V to 5.5 V (3) | ±1 | ±6 | %/V | |
| Δ I O(LC4) | Load regulation (see Figure 10) | All output ON, V O = 1 V to 3 V, R (IREF) = 640 Ω , OUT0 to OUT15 (4) | ±2 | ±6 | %/V | |
| All output ON, V O = 1 V to 3 V, R (IREF) = 320 Ω , OUT0 to OUT15 (4) | ±2 | ±8 | %/V | |||
| T (TEF) | Thermal error flag threshold | Junction temperature (5) | 150 | 170 | °C | |
| V (LED) | LED open detection threshold | 0.3 | 0.4 | V | ||
| V (IREF) | Reference voltage output | R (IREF) = 640 Ω | 1.20 | 1.24 | 1.28 | V |
TLC5940 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Input voltage (2) | VCC | -0.3 | 6 | V |
| Input voltage (2) | V (BLANK) , V (DCPRG) , V (SCLK) , V (XLAT) , V (SIN) , V (GSCLK) , V (IREF) | -0.3 | V CC +0.3 | V |
| Output voltage | V (SOUT) , V (XERR) | -0.3 | V CC +0.3 | V |
| Output voltage | V (OUT0) to V (OUT15) | -0.3 | 18 | V |
| Output current (dc) | 130 | mA | ||
| EEPROM program range | V (VPRG) | -0.3 | 24 | V |
| EEPROM write cycles | 50 | - | ||
| Storage temperature, T stg | -55 | 150 | °C |
TLC5940 Recommended Operating Conditions
| MIN | NOM | MAX | UNIT | |||
|---|---|---|---|---|---|---|
| DC CHARACTERISTICS | DC CHARACTERISTICS | DC CHARACTERISTICS | ||||
| V CC | Supply Voltage | Supply Voltage | 3 | 5.5 | V | |
| V O | Voltage applied to output (OUT0-OUT15) | Voltage applied to output (OUT0-OUT15) | 17 | V | ||
| V IH | High-level input voltage | High-level input voltage | 0.8 V CC | V CC | V | |
| V IL | Low-level input voltage | Low-level input voltage | GND | 0.2 V CC | V | |
| I OH | High-level output current | V CC = 5 V at SOUT | -1 | mA | ||
| I OL | Low-level output current | V CC = 5 V at SOUT, XERR | 1 | mA | ||
| I OLC | Constant output current | OUT0 to OUT15, V CC < 3.6 V OUT0 to OUT15, V CC > 3.6 V | 60 120 | mA mA | ||
| V (VPRG) | EEPROM program voltage | EEPROM program voltage | 20 | 22 | 23 | V |
| T A | Operating free-air temperature range | Operating free-air temperature range | -40 | 85 | °C | |
| AC CHARACTERISTICS V CC = 3 V to 5.5 V, T A = -40°C to 85°C (unless otherwise noted) | AC CHARACTERISTICS V CC = 3 V to 5.5 V, T A = -40°C to 85°C (unless otherwise noted) | AC CHARACTERISTICS V CC = 3 V to 5.5 V, T A = -40°C to 85°C (unless otherwise noted) | ||||
| f (SCLK) | Data shift clock frequency | SCLK | 30 | MHz | ||
| f (GSCLK) | Grayscale clock frequency | GSCLK | 30 | MHz | ||
| t wh0 /t wl0 | SCLK pulse duration | SCLK = H/L (see Figure 11) | 16 | ns | ||
| t wh1 /t wl1 | GSCLK pulse duration | GSCLK = H/L (see Figure 11) | 16 | ns | ||
| t wh2 | XLAT pulse duration | XLAT = H (see Figure 11) | 20 | ns | ||
| t wh3 | BLANK pulse duration | BLANK = H (see Figure 11) | 20 | ns |
TLC5940 Thermal Information
| THERMAL METRIC | (1) | TLC5940 - PWP (HTSSOP) - 28 PINS | TLC5940 - RHB (VQFN) - 32 PINS | UNIT |
|---|---|---|---|---|
| R θ JA | Junction-to-ambient thermal resistance | 36.7 | 34.3 | °C/W |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 18.9 | 36.8 | °C/W |
| R θ JB | Junction-to-board thermal resistance | 15.9 | 8.5 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 0.6 | 0.3 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 15.8 | 8.7 | °C/W |
| R θ JC(bot) | Junction-to-case (bottom) thermal resistance | 2.3 | 1.6 | °C/W |
TLC5940 Typical Application
The device is a 16-channel, constant sink current, LED driver. This device can be connected in series to drive many LED lamps with only a few controller ports. Output current control data, dot correction data and PWM control data can be written from the SIN input terminal.
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