TMC2225 DATASHEET (Rev. 1.15 / 2023-FEB-16)
4
1 Principles of Operation
The TMC2225 is intended as a drop-in upgrade for existing low-cost stepper driver applications. Its
silent drive technology StealthChop enables non-bugging motion control for home and office
applications. A highly efficient power stage enables high current from a tiny package.
The TMC2225 requires just a few control pins on its tiny package. They allow selection of the most
important setting: the desired microstep resolution. A choice of 2, 4, 8, 16 or 32 microsteps adapts the
driver to the capabilities of the motion controller. Some package options also allow chopper mode
selection by pin.
Even at low microstepping rate, the TMC2225 offers a number of unique enhancements over
comparable products: TRINAMICs sophisticated StealthChop2 chopper plus the microstep enhancement
MicroPlyer ensure noiseless operation, maximum efficiency and best motor torque. Its fast current
regulation and optional combination with SpreadCycle allow for highly dynamic motion. Protection
and diagnostic features support robust and reliable operation. A simple-to-use 8 bit UART interface
opens up more tuning and control options. Application specific tuning can be stored to on-chip OTP
memory. Industries’ most advanced step & direction stepper motor driver family upgrades designs to
noiseless and most precise operation for cost-effective and highly competitive solutions.
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 1.1 TMC2225 basic application block diagram
THREE MODES OF OPERATION:
OPTION 1: Standalone STEP/DIR Driver (Legacy Mode)
A CPU (µC) generates step & direction signals synchronized to additional motors and other
components within the system. The TMC2225 operates the motor as commanded by the configuration
pins and STEP/DIR signals. Motor run current either is fixed or set by the CPU using the analog input
VREF. The pin PDN_UART selects automatic standstill current reduction. Feedback from the driver to
the CPU is granted by the INDEX and DIAG output signals. Enable or disable the motor using the ENN
pin.
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