Step/Dir Drivers for Two-Phase Bipolar Stepper Motors up to 2.8A peak – StealthChop for Quiet Movement – UART Interface Option – Sensorless Stall Detection StallGuard4
TMC2226 DATASHEET (Rev. 1.06 / 2020-MAY-18) 10 PinNumber TypeFunction Power down not control input (low = automatic standstill current reduction). PDN_UART 18 DIO Optional UART Input/Output. Power down function can be disabled in UART mode. VCC_IO 19 3.3V to 5V IO supply voltage for all digital pins. STEP 20 DI STEP input Analog reference voltage for current scaling or reference current for VREF 21 AI use of internal sense resistors (optional mode) DIR 23 DI (pd) DIR input (internal pull-down resistor) STANDBY input. Pull up to disable driver internal supply regulator. This will bring the driver into a low power dissipation state. STDBY 24 DI (pd) 100kOhm pulldown. (may be left unconnected) Hint: Also shut down VREF voltage and ENN to 0V during standby. OA2 25 Motor coil A output 2 Sense resistor connection for coil A. Place sense resistor to GND BRA 27 near pin. Tie to GND when using internal sense resistor. OA1 28 Motor coil A output 1 - 13 unused May be connected to GND for better PCB routing Connect the exposed die pad to a GND plane. Provide as many as Exposed - possible vias for heat transfer to GND plane. Serves as GND pin for die pad power drivers and analogue circuitry. www.trinamic.com
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