4.2. Motoron M1U550, M2U550, M1U256 and M2U256 pinout

Motoron M1U550 Single Serial Motor Controller pinout.	Motoron M2U550 Dual Serial Motor Controller pinout.
Motoron M1U256 Single Serial Motor Controller pinout.	Motoron M2U256 Dual Serial Motor Controller pinout.

The diagrams above identify the control and power pins on the Motoron M1U550, M2U550, M1U256 and M2U256. Section 3.2.2 explains how to connect motor power, motors, and a microcontroller.

The motor power supply should be connected to the VIN pin and adjacent GND pin, and a motor can be connected to each pair of MxA and MxB pins (e.g. M1A and M1B). For more information on choosing a power supply and motors, see Section 3.1.

The Motoron’s logic is powered from the VDD pin, and it is controlled via UART serial through the TX and RX pins (see Section 7). Additional GND pins provide a common ground reference between the Motoron and device controlling it.

The VM pin provides access to the reverse-protected motor supply voltage.

The ERR pin drives high when the red LED is on, which usually indicates an error as described in Section 5. The ERR pin is protected by a 220Ω series resistor. When the red LED is not on, the ERR pin is pulled down weakly.

The RST pin can be driven low to reset the Motoron; see Section 12 for more details.

The JMP1 pin can be shorted to the adjacent GND pin to allow the Motoron’s serial settings to be changed, as detailed in Section 3.6. Also, shorting JMP1 to GND at startup causes the Motoron to ignore the serial settings configured in EEPROM and use safe default settings instead (see Section 10).