While the internal logic operates at 5V, the LED power supply ($V_LED$) can technically differ if the IC is powered separately, though in most integrated strip designs, $V_DD$ and $V_LED$ share the same 5V rail.
| Symbol | Parameter | Condition | Min | Typ | Max | Unit | |--------|----------------------|-----------------------|------|-----|------|------| | VIH | Logic Input High (D,DE) | | 2.0 | - | VCC | V | | VIL | Logic Input Low (D,DE) | | 0 | - | 0.8 | V | | VOH | Receiver Output High (R)| Iout = -4mA | 3.5 | 4.5 | - | V | | VOL | Receiver Output Low (R) | Iout = 4mA | - | 0.2 | 0.4 | V | | VOD | Differential Driver Out | RL = 54Ω (RS-485) | 1.5 | 2.5 | 3.0 | V | | IIN | Bus Input Current | Vbus = ±60V (disabled)| - | 10 | 100 | μA | | ICC | Supply Current (active)| No load, DE=1 | - | 1.5 | 3.0 | mA | highway09a ic datasheet
, pay close attention to the following sections to ensure successful integration: Pinout Diagram : Essential for identifying power, ground, and signal pins. Electrical Characteristics While the internal logic operates at 5V, the
| IC | I²C addr | PWM | Interrupt | Constant current | |----|----------|-----|-----------|------------------| | | 0x58 | Yes (256-step) | Yes | Yes (25mA) | | MCP23017 | 0x20 | No | Yes | No | | PCA9685 | 0x40 | Yes (12-bit) | No | No (open-drain) | | TCA6416 | 0x21 | No | Yes | No | though in most integrated strip designs
If you are looking to "hack" or repair a device using this IC, here are the vital stats: HIGHWAY09A Holtek Integrated Circuits (ICs) - Jotrin
Place ceramic decoupling capacitors (typically 0.1μF to 10μF) close to the VIN and VOUT pins to minimize noise and improve stability.