TMC2041 DATASHEET (Rev. 1.02 / 2017-MAY-16)
12
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.
22n
+VM
VS
+VM
VCP
100n
100µF
charge pump
Step/Dir interface
100n
4.7µ
O1A1
O1A2
VSA
Full Bridge A
Full Bridge B
N
5V Voltage
regulator
high current
stepper motor
5VOUT
S
100n
Sequencer &
Microplyer
Driver 1
O1B1
O1B2
BR1A
BR1B
VCC
CSN/IO0
SCK/IO1
SDI/IO2
SDO
SPI interface
VS
TMC2041
NEXTADDR
SWIOP
100n
Single wire
interface
SWION
+VIO
O2A1
O2A2
Full Bridge A
Full Bridge B
SW_SEL
Sequencer &
Microplyer
Driver 2
ENC1A/INT
ENC1B/PP
O2B1
O2B2
BR2A
BR2B
INT & position
pulse output
opt. ext. clock
CLK_IN
12-16MHz
+VIO
Step/Dir interface
3.3V or 5V
I/O voltage
VCC_IO
100n
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.
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