Datasheet
TMC2041 DATASHEET (Rev. 1.02 / 2017-MAY-16) 12
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3.3 One Motor with High Current
The TMC2041 supports double motor current for a single driver by paralleling both power stages. In
order to operate in this mode, activate the flag single_driver in the global configuration register
GCONF. This register can be locked for subsequent write access.
VCC_IO
SPI interface
CSN/IO0
SCK/IO1
SDO
SDI/IO2
Single wire
interface
5V Voltage
regulator
charge pump
VCP
22n
100n
SWION
SW_SEL
CLK_IN
SWIOP
+V
M
5VOUT
VSA
4.7µ
+V
IO
ENC1A/INT
ENC1B/PP
INT & position
pulse output
NEXTADDR
DRV_ENN
DRV_ENN
GNDP
GND
GNDA
TST_MODE
DIE PAD
VCC
opt. ext. clock
12-16MHz
3.3V or 5V
I/O voltage
100n
100n
Full Bridge A
Full Bridge B
+V
M
VS
high current
stepper motor
N
S
O1A1
O1A2
BR1A
R
S1B
O1B1
O1B2
Driver 1
100n
BR1B
R
S1A
Full Bridge A
Full Bridge B
O2A1
O2A2
BR2A
O2B1
O2B2
Driver 2
BR2B
VS
100n
+V
M
100µF
CPI
CPO
+V
IO
Step/Dir interface
STEP1
DIR1
Step/Dir interface
Sequencer &
Microplyer
Sequencer &
Microplyer
STEP2
DIR2
TMC2041
Figure 3.3 Driving a single motor with high current
3.4 External 5V Power Supply
When an external 5V power supply is available, the power dissipation caused by the internal linear
regulator can be eliminated. This especially is beneficial in high voltage applications, and when
thermal conditions are critical.
3.4.1 Internal Regulator Bridged
In case a clean external 5V supply is available, it can be used for complete supply of analog and
digital part (Figure 3.4). The circuit will benefit from a well regulated supply, e.g. when using a +/-1%
regulator. A precise supply guarantees increased motor current precision, because the voltage at
5VOUT directly is the reference voltage for all internal units of the driver, especially for motor current
control. For best performance, the power supply should have low ripple to give a precise and stable
supply at 5VOUT pin with remaining ripple well below 5mV. Some switching regulators have a higher
remaining ripple, or different loads on the supply may cause lower frequency ripple. In this case,
increase capacity attached to 5VOUT. In case the external supply voltage has poor stability or low
frequency ripple, this would affect the precision of the motor current regulation as well as add
chopper noise.