TMC4330A Datasheet | Document Revision 1.01 • 2017-JAN-12
Per default, the trigger is closely followed by the internal start signal.
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Delay Definition
between Trigger
and internally
generated Start
Signal
In order to delay the generation of the internal start signal, do the
following:
Action:
Set START_DELAY register 0x13 according to your specification.
Result:
When a start trigger is recognized, the internal start signal is generated after
START_DELAY clock cycles.
Prioritizing
Per default, an external trigger is also delayed for the internal start signal generation.
External Input
In order to immediately prompt an external start, trigger to an internally
generated start signal (regardless of a defined delay), do the following:
Action:
Set immediate_start_in = 1 (START_CONF register 0x02).
Result:
When an external start trigger is recognized, the internal start signal is generated
immediately, even if the internal start triggers have already initiated a timing process
with an active delay.
START Pin
Polarity
The START pin can be used either as input or as output pin. However, the active
voltage level polarity of the START pin can be selected with one configuration switch
in the START_CONF register 0x02.
Per default, the voltage level transition from high to low triggers a start signal (START
is an input), or START output indicates an active START event by switching from high
to low level.
In order to invert active START polarity, do as follows:
Action:
Set pol_start_signal = 1 (START_CONF register 0x02).
Result:
The START pin is high active. The voltage level transition from low to high triggers a
start signal (START is an input), or START output indicates an active START event by
switching from low to high level.
Per default, the active output voltage level of the START pin lasts one clock cycle.
Active START Pin
Output
In order to extend this time span, do the following:
Configuration
Condition:
START pin is assigned as output: trigger_events(0) = 1.
Action:
Set START_OUT_ADD register 0x11 according to your specification.
Result:
The active voltage level lasts (START_OUT_ADD + 1) clock cycles.
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