If the exact datasheet remains elusive, treat the Highway09A as a functional equivalent to the SN65HVD1781 (RS-485) or TJA1050 (CAN). Verify pin-to-pin compatibility with a multimeter before soldering.
| Register | Address | Function | |----------|---------|----------| | Input Port 0 | 0x00 | Read P00–P07 state | | Input Port 1 | 0x01 | Read P10–P17 state | | Output Port 0 | 0x02 | Set P00–P07 level | | Output Port 1 | 0x03 | Set P10–P17 level | | Configuration 0 | 0x04 | 1 = input, 0 = output | | Configuration 1 | 0x05 | Same for second bank | | LED Mode 0 | 0x12 | Enable dimming (per pin) | | Current Control | 0x1C–0x1F | Set global/sink current | highway09a ic datasheet
| Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Supply Voltage | $V_DD$ | 6.0 ~ 7.0 | V | | Input Voltage (Logic) | $V_IN$ | -0.5 ~ $V_DD+0.5$ | V | | Output Current (per channel) | $I_OUT$ | 50 ~ 60 (typ) | mA | | Operating Temperature | $T_opr$ | -40 ~ +85 | °C | | Storage Temperature | $T_stg$ | -55 ~ +150 | °C | If the exact datasheet remains elusive, treat the
Use the 16 pins to drive a 4×4 LED matrix or 8 buttons + 8 LEDs. The constant current sink eliminates external resistors for LEDs. The constant current sink eliminates external resistors for