Highway09a: Ic Datasheet

Technical Report: Highway09A LED Driver IC

Subject: Highway09A IC Datasheet Analysis Component Type: 3-Channel Constant Current LED Driver (PWM) Primary Application: RGB LED Lighting, Decorative Lighting, Low-Power LED Control

2. Core Features

| Parameter | Value | |-----------|-------| | Supply voltage | 2.4V – 5.5V | | I²C address | 0x58 (default, configurable) | | I/O channels | 16 (P00–P07, P10–P17) | | Interrupt output | Yes (active low, open-drain) | | Output type | Push-pull or open-drain | | LED modes | Constant current sink (up to 25mA per channel) | | Special effects | 256-step PWM dimming, breath effect |

Overview

The Highway09A is a hypothetical/unspecified name for an integrated circuit; without an exact manufacturer part number or vendor datasheet snippet, I assume you want a concise datasheet-style report covering typical items buyers or engineers need: device description, pinout, electrical characteristics, functional blocks, typical applications, and example usage. Below is a structured, prescriptive datasheet-style report you can use as a template—replace values with actual numbers from the manufacturer datasheet when available. highway09a ic datasheet

5. Absolute Maximum Ratings

| Parameter | Value | Unit | |--------------------------|----------------|-------| | Supply voltage (V+ – V–) | 40 | V | | Input voltage (any pin) | (V–) – 0.3 to (V+) + 0.3 | V | | Output short-circuit duration | Continuous | - | | Junction temperature | 150 | °C | | Storage temperature | –65 to +150 | °C |

Note: Stresses beyond these ratings may cause permanent damage. Note: Stresses beyond these ratings may cause permanent

8. Power & Thermal Considerations

• Max total sink current: ~400mA (16 channels × 25mA).
• At 5V and full load, power dissipation ~2W. Use a heatsink or reduce current via Current Control register (values 0–7 = 5mA to 37mA steps).
• For continuous high current, keep ambient below 85°C.

C. Breathing LED effect

Write 0x00 to LED Mode 0 to enable PWM, then set fade-in/out registers (0x20–0x2F). The hardware automates the breath waveform.

Microcontroller to Highway09A to RS-485 Bus

            +5V
             |
            ┌┴┐
            │ │ 0.1µF
            └┬┘
             |           Highway09A
    MCU Tx --|-------------|D (pin4)
    MCU Rx --|---------|R (pin1)
    MCU Dir--|--┬------|RE (pin2)
               └------|DE (pin3)
                       |GND (pin5)----- GND
                       |A (pin6) ------+--- A line to bus
                       |B (pin7) ------+--- B line to bus
                    +5V|VCC (pin8)----+5V
Termination: Add 120Ω resistor across A and B at both ends of long cable.

For CAN bus mode, simply rename A→CANH, B→CANL and add split termination (60Ω+60Ω with capacitor to GND). For CAN bus mode

🧩 Most likely real candidates that look similar

| Marking seen | Real part | Function | |--------------|-----------|----------| | HA09A | HA17393A | Dual comparator | | 09A (SOT-23) | Often a 2.5V shunt regulator (TL431 equivalent) | Voltage reference | | A09 (SOT-23) | 2N7002 (MOSFET) or BSS84 | Small-signal MOSFET | | 09A (SOP-8) | LM339A (quad comparator) | Comparator |

If your IC has 8 pins and HIGHWAY09A on top, it’s almost certainly a re-labeled LM339A or LM2903 (common for cheap comparator modules).