User Manual

TMCM-3212, TMCM-3213 Hardware Manual (V0.95 / 2017-MAR-01) 23

6 Motor driver current

The stepper motor driver section of the TMCM-3212 + TMCM-3213 operates current controlled. The driver current

may be programmed in software with 256 effective scaling steps in hardware up-to 3A RMS / 4.2A peak max.

motor coil current.

Motor current measured for one phase with max. current settings (100% e.g. “SAP 179, 0, 0” and “SAP 6, 0, 255”)

and 256 microsteps:

CH1 (yellow): motor current [100mV / A]

Motor current

setting in

software (TMC)

In TMCL axis parameter 6 (motor run current) and 7 (motor standby current) can be used

for motor current setting:

SAP 6, 0, <value> // set run current

SAP 7, 0, <value> // set standby current

For <value> numbers between 0 (minimum) and 255 (maximum) are supported. Motor

current is scaled linearly up-to 3A RMS / 4.2A peak.

(read-out value with GAP instead of SAP. Please see separate TMCM-3212 / TMCM-3213

firmware / software manual for further information)

Range setting

in software

(TMCL)

TMCL axis parameter 179 (Vsense) will set the current range:

SAP 179, 0, <value> // = 0 high current range

// up-to 3A RMS/4.2A peak

// = 1 low current range

// up-to 1.7A RMS / 2.4A peak

For <value> either 0 (high current range) or 1 (low current range) is supported.

(read-out value with GAP instead of SAP.