Datasheet

TMC4361A Datasheet | Document Revision 1.22 • 2017-JAN-12

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Read entire documentation; especially the “Supplemental Directives” on page 224.

 MAIN MANUAL 

Masterless Synchronization of Several Motion Controllers via START Pin

START pin can also be assigned as tristate input in order to synchronize several microcontroller

masterless.

In this case START is assigned as tristate. A busy state is enabled. During this busy

state, START is set as output with a strongly driven inactive polarity. If the internal

start signal is generated – after the internal start timer is expired –START pin is

assigned as input. Additionally, a weak output signal is forwarded at START. During

this phase, the active start polarity is emitted.

In case the signal at START input is set to active polarity, because all members of the

signal line are ready, START output remains active (strong driving strength) for

START_OUT_ADD

clock cycles.

Then, busy state is active again until the next start signal occurs.

In order to activate tristate START pin, do as follows:

Action:

 Set

busy_en

= 1 (

START_CONF

Result:

The above mentioned process description is executed.

In case START pin is connected with START pins of other TMC4361A devices, it is

recommend that a series resistor (e.g. 220 Ω) is connected between the devices to

limit the short circuit current flowing that can flow during the configuration phase

when different voltage levels at the START pins of the different devices can occur.

NOTE:



Avoid that short circuits last too long.

Activation of the

Tristate START

START Pin

Connection