TMC2041 DATASHEET (Rev. 1.02 / 2017-MAY-16)
10
3 Sample Circuits
The sample circuits show the connection of the external components in different operation and
supply modes. The connection of the bus interface and further digital signals is left out for clarity.
3.1 Standard Application Circuit
22n
+VM
VS
Optional use lower
voltage down to 6V
+VM
VCP
100n
100µF
charge pump
Step/Dir interface
100n
O1A1
O1A2
VSA
Full Bridge A
Full Bridge B
N
S
5V Voltage
regulator
stepper
motor #1
5VOUT
100n
Sequencer &
Microplyer
4.7µ
Driver 1
2R2
O1B1
O1B2
BR1A
BR1B
VCC
470n
CSN/IO0
SCK/IO1
SDI/IO2
SDO
R1A
R1B
SPI interface
VS
TMC2041
NEXTADDR
SWIOP
100n
Single wire
interface
SWION
+VIO
O2A1
O2A2
Full Bridge A
Full Bridge B
N
S
stepper
motor #2
SW_SEL
Sequencer &
Microplyer
Driver 2
O2B1
O2B2
BR2A
BR2B
opt. ext. clock
12-16MHz
CLK_IN
VCC_IO
+VIO
Step/Dir interface
R2A
R2B
3.3V or 5V
I/O voltage
100n
Figure 3.1 Standard application circuit
The standard application circuit uses a minimum set of additional components in order to operate the
motor. Use low ESR capacitors for filtering the power supply which are capable to cope with the
current ripple. The current ripple often depends on the power supply and cable length. The VCC_IO
voltage can be supplied from 5VOUT, or from an external source, e.g. a low drop 3.3V regulator. In
order to minimize linear voltage regulator power dissipation of the internal 5V voltage regulator in
applications where VM is high, a different (lower) supply voltage can be used for VSA, if available. For
example, many applications provide a 12V supply in addition to a higher supply voltage like 24V.
Using the 12V supply for VSA will reduce the power dissipation of the internal 5V regulator to about
37% of the dissipation caused by supply with the full motor voltage. For best motor chopper
performance, an optional R/C-filter de-couples 5VOUT from digital noise cause by power drawn from
VCC.
Basic layout hints
Place sense resistors and all filter capacitors as close as possible to the related IC pins. Use a solid
common GND for all GND connections, also for sense resistor GND. Connect 5VOUT filtering capacitor
directly to 5VOUT and GNDA pin. See layout hints for more details. Low ESR electrolytic capacitors are
recommended for VS filtering.
Attention
In case VSA is supplied by a different voltage source, make sure that VSA does not exceed VS by
more than one diode drop upon power up or power down.
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