Datasheet

TMC2209 DATASHEET (Rev. 1.03 / 2019-JUN-26) 10
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Pin
Number
Type
Function
VCC_IO
15
3.3V to 5V IO supply voltage for all digital pins.
STEP
16
DI
STEP input
VREF
17
AI
Analog reference voltage for current scaling or reference current for
use of internal sense resistors (optional mode)
DIR
19
DI (pd)
DIR input (internal pull-down resistor)
STDBY
20
DI (pd)
STANDBY input. Pull up to disable driver internal supply regulator.
This will bring the driver into a low power dissipation state.
100kOhm pulldown. (may be left unconnected)
Hint: Also shut down VREF voltage and ENN to 0V during standby.
VS
22, 28
Motor supply voltage. Provide filtering capacity near pin with
shortest possible loop to GND pad.
OA2
21
Motor coil A output 2
BRA
23
Sense resistor connection for coil A. Place sense resistor to GND near
pin. Tie to GND when using internal sense resistor.
OA1
24
Motor coil A output 1
-
25
unused
May be connected to GND for better PCB routing
OB1
26
Motor coil B output 1
BRB
27
Sense resistor connection for coil B. Place sense resistor to GND near
pin. Tie to GND when using internal sense resistor.
Exposed
die pad
-
Connect the exposed die pad to a GND plane. Provide as many as
possible vias for heat transfer to GND plane. Serves as GND pin for
power drivers and analogue circuitry.