Caution: Continuous operation near maximum ratings is not recommended. These values help determine compatibility with your MCU (e.g., Arduino, STM32, PIC).
For CAN mode: Differential output voltage into 60Ω load is typically 1.5V to 3.0V. Understanding the enable logic prevents common bus contention issues. highway09a ic datasheet
Remember: Always verify the actual markings on your IC. If it says "Highway09A" followed by a batch code, test the basic functions (supply current, driver output swing, receiver thresholds) before committing to a large PCB run. Caution: Continuous operation near maximum ratings is not
For half-duplex 2-wire networks (RS-485), tie RE and DE together. Connect to MCU pin for TX/RX switching. 6. Application Circuit Example 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 half-duplex 2-wire networks (RS-485), tie RE and
| 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 |
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