TMC2225 DATASHEET (Rev. 1.15 / 2023-FEB-16)
10
3 Sample Circuits
The sample circuits show the connection of 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
Place near IC with
short path to die pad
2.2µ
6.3V
Step and Direction
motion control
TMC2225
STEP
DIR
Step&Dir input
Configuration
(GND or VCC_IO)
optional UART interface
MS1
MS2
SPREAD
(only TMC222x)
PDN/UART
Driver error
Index pulse
opt. ext. clock
10-16MHz
3.3V or 5V
I/O voltage
DIAG
INDEX
(not with TMC2202)
CLK_IN
VCC_IO
100n
Step Pulse
Generator
Configuration
Memory (OTP)
Configuration
Interface
B. Dwersteg, ©
TRINAMIC 2016
UART interface
+ Register Block
Programmable
Diagnostic
Outputs
Trimmed
CLK oscillator/
selector
5V Voltage
regulator
Stand Still
Current
Reduction
256 Microstep
Sequencer
Analog Scaling
VREF IREF
stealthChop2
Driver
spreadCycle
22n
50V
charge pump
Full Bridge A
100n
16V
VS
OA1
OA2
+VM
100n
100n
100µF
Low ESR type
N
S
stepper
motor
BRA RSA
Integrated IREF
Rsense
Full Bridge B
Connect directly
to GND plane
Use low inductivity SMD
type, e.g. 1206, 0.5W for
RSA and RSB
OB1
OB2
BRB RSB
Connect directly
to GND plane
opt. driver enable
Figure 3.1 Standard application circuit
The standard application circuit uses a minimum set of additional components. Two sense resistors
set the motor coil current. See chapter 8 to choose the right sense resistors. Use low ESR capacitors
for filtering the power supply. The capacitors need to cope with the current ripple cause by chopper
operation. A minimum capacity of 100µF near the driver is recommended for best performan ce.
Current ripple in the supply capacitors also depends on the power supply internal resistance and
cable length. VCC_IO can be supplied from 5VOUT, or from an external source, e.g., a 3.3V regulator.
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 capa citor
directly to 5VOUT and the die pad. See layout hints for more details. Low ESR electro lytic capacitors
are recommended for VS filtering.
Attention
Ensure sufficient capacity on VS to limit supply ripple, and to keep power slopes below 1V/µs. Failure
to do so could result in destructive currents via the charge pump capacitor. Provide overvoltage
protection in case the motor could be manually turned at a high velocity, or in case the driver could
become cut off from the main supply capacitors. Significant energy can be fed back from motor coils
to the power supply in the event of quick deceleration, or when the driver becomes disabled.
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