APPLICATION NOTE
©2018 TRINAMIC Motion Control GmbH & Co. KG, Hamburg, Germany
Download newest version at: www.trinamic.com
OB2
ENN
GND
CPO
-
OB1
BRA
CLK
INDEX
MS2
DIAG
STEP
VREF
GND
DIR
-
OA2
CPI
VCP
PDN_UART
MS1
5VOUT
OA1
-
BRB
VS
VS
VCC_IO
1 2 3 4 5 6 7
21201918171615
22232425262728
141312111098
TMC2208
QFN28
Pad=GND
©B.Dwersteg, TRINAMIC
AN45: How to replace Allegro A4988 with TMC2208
Document Revision V1.3 • 2018-Jan-30
The TMC2208 is an advanced 1-axis stepper driver, which supports stealthChop™ and 256 microsteps.
This appnote shows how to setup the TMC2208 as a replacement of the A4988 (legacy mode).
Contents
1 Pin Comparison 1
2 Application Example 4
3 Revision History 6
1 Pin Comparison
The TMC2208 in comparison with other motor drivers comes with additional features:
Power down
An automatic current reduction reduces power dissipation and cooling requirements.
Per default, the stand still current reduction is enabled by pulling PDN UART input to
GND.
UART
The UART single wire interface allows control of the TMC2208 with any microcontroller
UART. This gives the possibilty to program the TMC2208 and add additional features
such as full 256 Microsteps control (not only interpolation). UART is not available in
legacy mode.
Diagnostics An active DIAG output shows that the driver cannot work normally.
Index
The INDEX output signals the microstep counter zero position, which occurs once per
electrical revolution/four fullsteps. In combination with a mechanical home switch, a
more precise homing is enabled.
256 microsteps
The TMC2208 is able to control the motor with 256 microsteps per fullstep. In legacy
mode the TMC2208 will interpolate received step signals to 256 microsteps.
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