TMC389-EVAL MANUAL (V. 1.10 / 2011-Mar-01)
6
Copyright © 2010 TRINAMIC Motion Control GmbH & Co. KG
4.1.3
Step and direction input K2
Pin
Number Level
Description
DIR
1
VIO
Direction input of TMC389. Direction output of microcontroller when
enabled via software (step/dir
RUN)
GND
2
GND
Ground reference
STEP
3
VIO
Direction input of TMC389. Step output of microcontroller when
enabled via software (step/dir
RUN)
4.1.4
JTAG programmer K14
Pin
Number Level
Description
NRST
15
3.3V
CPU reset pin. Place a jumper between pin 15 and 16 to disable the
CPU. In this mode, the CPU does not drive the TMC389, and you
can freely access its SPI interface via the header connectors next to
the TMC389.
GND
16
GND
Ground
This connector can be used for debugging of CPU software and for programming via JTAG.
4.1.5
USB (K15) and RS232 (K16)
PC interface for operation with the demonstration software. The USB port is handled as a virtual COM
port.
4.2 Jumpers
4.2.1
Clock selection J15
Setting
Function
Description
1-2
GND
TMC389 uses internal clock
2-3
CLK_ARM TMC389 uses clock signal provided by the microcontroller.
4.2.2
VCC_IO J16
Selects the VCC_IO voltage source for the TMC389.
Setting
Function Description
1-2
3V3
3.3V supply of microcontroller
2-3
5V
5V voltage supplied by TMC389 voltage regulator
4.2.3
VSENSE J5, (J6)
J5 selects the source of the sense resistor voltage of the TMC389. Always use position 1-2 for normal
operation.
Setting
Function Description
1-2
sense
resistor
Normal operation, the TMC389 uses the shunt resistors for current
sensing
2-3
external
input
Sense resistor signals can be supplied via J6 for testing purpose
