TMC424 Datasheet – (V1.04 / 2015-JUL-01)

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Copyright © 2011 TRINAMIC Motion Control GmbH & Co. KG

3.2 Application Examples

3.2.1 Application with TMC6x Stepper Motor Driver

This example illustrates the encoder connection and the use of reference switches with the TMC424

and additionally the SPI interface connections between TMC424, TMC429 and a microcontroller. The

communication to the drivers (e.g. TMC260) is performed via SPI by the TMC429 motion control chip.

On some package variants of the TMC429, the REFR pins are available. Those should be preferred to

the STOPR/STOPL inputs of the TMC424's multiplexer.

TMC429

CLK

REF1

REF2

REF3

SDI_C

SCK_C

SDO_C

nSCS_C

V5

V33

Test

GND

SDI_S

SCK_S

SDO_S

nSCS_S

Notes:

1. If the NSCS429 pin is not in use it has to be tied to +3.3V

2. NSCS_D activates the reference switches (inputs

STOPRx/STOPLx and outputs REFx).

TMC424

CLK

RESET

ENC1_A

ENC1_B

ENC1_N

ENC2_A

ENC2_B

ENC2_N

ENC3_A

ENC3_B

ENC3_N

REF1

REF2

REF3

SDI

SCK

SDO

NSCS

SDO429

NSCS429

VCC

VCORE

SDI_D

SCK_D

NSCS_D

STOPR0 - STOPR2

STOPL0 - STOPL2

TRST

TMS

GND

TCK

TDI

GND

+1.5V

+3.3V

16MHz

+3.3V

10k each

16MHz

µC

+3.3V

GND

SPI

to

Drivers

470nF

+3.3V

10k

6x Reference Switch

Inputs (active high)

from nSCS_S

of TMC429

to nSCS_D

of TMC424

Figure 4: Example for Application with TMC26x Stepper Motor Driver

3.2.2 Application with Step/Direction Power Stage

Additionally to the previous example the use of the TMC424 as step/direction converter is shown. This

can be used with the TMC429 as a drop-in replacement for the TMC428. The reference switches can

also be used as above.

TMC429

SCK_C

SDI_C

SDO_C

nSCS_C

SDO_S

SCK_S

SDI_S

nSCS_S

CLK

V5

V33

Test

GND

Note:

If the NSCS429 pin is not in use, it has to be tied to +3.3V

GND

+1.5V

+3.3V

+3.3V

10k

16MHz

+3.3V

10k each

16MHz

+3.3V

GND

GND

TMC424

CLK

RESET

ENC1_A

ENC1_B

ENC1_N

ENC2_A

ENC2_B

ENC2_N

ENC3_A

ENC3_B

ENC3_N

NSCS

SDO

SCK

SDI

SDO429

NSCS429

SDI_D

SCK_D

SDO_D

NSCS_D

STEP1

DIR1

STEP2

DIR2

STEP3

DIR3

VCC

VCORE

SDI_D

SCK_D

TRST

TMS

STOPR0 - STOPR2

STOPL0 - STOPL2

GND

TCK

TDI

µC

Step/DIR

to

Drivers

470nF

Figure 5: Example for Application with Step/Direction