Highway09a Ic Datasheet (Linux RECENT)

            +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).

(Confirm actual pin names/ordering with manufacturer datasheet.) highway09a ic datasheet

Add buttons, relays, or sensors to an ESP8266 (which has limited GPIO) without extra analog muxes.

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

While the exact pinout may vary, a typical highway transceiver like the Highway09A uses an 8-pin package. Below is a standard RS-485/CAN compatible pinout: For CAN bus mode, simply rename A→CANH, B→CANL

| Pin Number | Name | Function Description | |------------|---------|--------------------------------------| | 1 | R | Receiver Output (logic level) | | 2 | RE | Receiver Enable (active low) | | 3 | DE | Driver Enable (active high) | | 4 | D | Driver Input (TTL/CMOS) | | 5 | GND | Ground Connection | | 6 | A / CANH| Non-inverting Bus Line | | 7 | B / CANL| Inverting Bus Line | | 8 | VCC | Positive Supply (5V or 3.3V) |

For CAN bus mode (Highway09A-C):

For RS-485 mode (Highway09A-485):

| Parameter | Symbol | Test Condition | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Supply Voltage | $V_DD$ | | 4.5 | 5.0 | 5.5 | V | | Quiescent Current | $I_DD$ | No Load | | 2 | | mA | | Output Current Constant Value| $I_OH$ | $V_DS=1.0V$ | 17 | 18.5 | 20 | mA | | Output Current Mismatch | $\Delta I_OUT$ | Between channels | | | ±3 | % | | Data Transmission Rate | | | | 800 | | Kbps | | Refresh Rate | | | | 2.5 | | kHz |

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

To achieve the performance promised in the highway09a ic datasheet, follow these PCB rules: follow these PCB rules: