TLC5940

@@ -0,0 +1,72 @@+# TLC5940++**Texas Instruments** · 16-channel LED / PWM driver · HTSSOP-28++A 16-channel constant-current LED driver in HTSSOP-28, for driving LEDs at precise, uniform brightness. Each of the sixteen open-drain outputs sinks a programmed constant current (set by one external resistor), so LED brightness does not depend on forward-voltage spread, and each channel gets an individual 12-bit (4096-step) grayscale PWM value plus a 6-bit dot-correction trim to even out channel-to-channel differences. Data shifts in serially (SIN/SCLK/XLAT) and the outputs can be daisy-chained (SOUT) to drive dozens of channels from a few pins. It is a staple of RGB matrices, mood lighting, and video walls. The 3D model shown is a representative TSSOP-28 body; the real package is HTSSOP-28 with a thermal pad.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | Device ground / substrate return for the digital core and analog reference. Must be tied to the system ground plane; the HTSSOP thermal pad should also connect to GND for heat spreading. |+| 2 | BLANK | input | Blank-all-outputs control. When BLANK = H, all OUTn are forced OFF and the grayscale counter is reset. When BLANK = L, OUTn are driven under 12-bit grayscale PWM. CMOS input, VIH ≥ 0.8·VCC. |+| 3 | XLAT | input | Level-triggered latch signal. On XLAT high, shift-register data is latched into the GS register (VPRG = L) or DC register (VPRG = H). When XLAT is low, GS/DC data is held constant. Minimum pulse width 20 ns. |+| 4 | SCLK | input | Serial data shift clock for the input shift register (data on SIN sampled on rising edge). Supports data-rates up to 30 MHz; minimum H/L pulse width 16 ns. |+| 5 | SIN | input | Serial data input. Data is shifted into the 192-bit (GS) or 96-bit (DC) input shift register MSB-first on the rising edge of SCLK. |+| 6 | VPRG | input | Multifunction mode-select input. VPRG = GND → GS (grayscale) mode; VPRG = VCC → DC (dot correction) mode; VPRG = V(PRG) (20-23 V) with DCPRG = H → programs DC data into the on-chip EEPROM. Reset EEPROM default is 3Fh. |+| 7 | OUT0 | output | Constant-current LED sink output 0. Sinks 0-60 mA (VCC < 3.6 V) or 0-120 mA (VCC > 3.6 V); modulated by 12-bit grayscale PWM × 6-bit dot correction. LED anode tied to LED supply (up to 17 V). |+| 8 | OUT1 | output | Constant-current LED sink output 1. See OUT0. |+| 9 | OUT2 | output | Constant-current LED sink output 2. See OUT0. |+| 10 | OUT3 | output | Constant-current LED sink output 3. See OUT0. |+| 11 | OUT4 | output | Constant-current LED sink output 4. See OUT0. |+| 12 | OUT5 | output | Constant-current LED sink output 5. See OUT0. |+| 13 | OUT6 | output | Constant-current LED sink output 6. See OUT0. |+| 14 | OUT7 | output | Constant-current LED sink output 7. See OUT0. |+| 15 | OUT8 | output | Constant-current LED sink output 8. See OUT0. |+| 16 | OUT9 | output | Constant-current LED sink output 9. See OUT0. |+| 17 | OUT10 | output | Constant-current LED sink output 10. See OUT0. |+| 18 | OUT11 | output | Constant-current LED sink output 11. See OUT0. |+| 19 | OUT12 | output | Constant-current LED sink output 12. See OUT0. |+| 20 | OUT13 | output | Constant-current LED sink output 13. See OUT0. |+| 21 | OUT14 | output | Constant-current LED sink output 14. See OUT0. |+| 22 | OUT15 | output | Constant-current LED sink output 15. See OUT0. |+| 23 | XERR | output | Open-drain error flag output. Pulled low when either LED-open-detection (LOD) or thermal-error-flag (TEF) asserts. Requires an external pull-up to VCC (typ. 10 kΩ). |+| 24 | SOUT | output | Serial data output - end of the 192-bit shift register, allowing cascade of multiple TLC5940 devices. IOH = -1 mA, IOL = 1 mA (VCC = 5 V). |+| 25 | GSCLK | input | Reference clock for the internal 12-bit grayscale PWM counter. Up to 30 MHz; drives the 4096-step brightness ramp for all 16 channels. |+| 26 | DCPRG | input | Switch DC-data source. DCPRG = L → DC values read from EEPROM; DCPRG = H → DC values read from the DC register. In combination with VPRG = V(PRG) it initiates EEPROM programming (default 3Fh). |+| 27 | IREF | passive | Reference-current programming terminal. An external resistor from IREF to GND sets the maximum sink current for all 16 outputs; VREF ≈ 1.24 V. IOLC = 60 mA (VCC < 3.6 V) or 120 mA (VCC > 3.6 V). |+| 28 | VCC | power_in | Logic and analog supply voltage. Recommended operating range 3.0-5.5 V (abs-max 6 V). Bypass with a 100 nF ceramic close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 16-channel constant-current LED driver |+| Channels | 16 (open-drain current sinks) |+| Grayscale | 12-bit PWM per channel |+| Dot correction | 6-bit per channel |+| Current set | single external resistor |+| Interface | serial (SIN/SCLK/XLAT), cascadable |+| Supply voltage | 3-5.5 V |+| Package | HTSSOP-28 (thermal pad) |++## Ordering variants++- `TLC5940PWP (HTSSOP-28)`+- `TLC5940NT (PDIP-28)`++## CAD (KiCad official)++- Symbol: `Driver_LED:TLC5940PWP`+- Footprint: `Package_SO:HTSSOP-28-1EP_4.4x9.7mm_P0.65mm`+- 3D model: TSSOP-28 (representative; real package HTSSOP-28)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tlc5940.pdf) (40 pp, sha256 `0177686922a94a12`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/tlc5940-datasheet.pdf)

@@ -0,0 +1,36 @@+{+  "slug": "tlc5940",+  "version": "0.1.0",+  "type": "component",+  "description": "TI 16-channel constant-current LED driver, HTSSOP-28. 12-bit PWM + 6-bit dot correction, daisy-chainable. Datasheet-verified.",+  "tags": [+    "component",+    "driver",+    "led-driver",+    "pwm",+    "constant-current",+    "htssop-28",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "tlc5940.kicad_sym",+    "tlc5940.kicad_mod",+    "tlc5940.glb",+    "docs/hero.png",+    "docs/tlc5940-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file