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 
TMC4361A supports the mixed decay feature for the TMC23x/24x chopper in
SPI_OUT_CONF register 0x04.
In order to configure mixed decay bits for TMC23x/24x, do as follows:
Action:
 Set mixed_decay = b’00 if mixed decay must always be deactivated.
 Set mixed_decay = b’01 if mixed decay must be activated for each coil during the
falling ramp of the sine curve until reaching value 0.
 Set mixed_decay = b’10 if mixed decay must always be activated, except during
standstill.
 Set mixed_decay = b’11 if mixed decay must always be activated.
Result:
The mixed decay bits for TMC23x/24x stepper motor drivers are set according to the
configuration and the internal MSLUT values.
i Please refer to the TMC23x/TMC24x datasheets to get more information about
the configuration of mixed decay bits.
TMC4361A forwards the internal clock at the output pin STDBY_CLK. This pin can also
be used to provide an external clock for the TMC23x/24x stepper motor driver. This
external clock generator automatically generates clock cycles that are modified by the
chopSync feature if TMC23x/24x is configured as connected motor driver. Using
chopSync enhances the motor drive for fast and smooth operation.
In order to enable the chopSync clock via the STDBY_CLK pin, do as follows:
Action:
 Set CHOPSYNC_DIV register 0x1F to generate an external clock frequency f
OSC
according to the following equation: f
OSC
= f
CLK
/ CHOP_SYNC_DIV.
 Set stdby_clk_pin_assignment = b’10 ( GENERAL_CONF register 0x00).
Result:
STDBY_CLK generates an external clock with the selected frequency f
OSC
that
automatically provides the chopSync feature.
i Recommended minimum external frequency f
OSC
: two times higher than audible
range.
Because chopper noise is of more concern during standstill than during motion,
TMC4361A provides an option to automatically double the ChopSync frequency during
standby.
If seleceted, a ChopSync frequency within the audible range can be selected. If
doubled, ChopSync frequency operates outside audible range.
In order to enable automatic chopSync frequency doubling, do as follows:
Action:
 Activate any of the above mentioned mixed_decay options.
 Set double_freq_at_stdby = 1 (SPI_OUT_CONF register 0x04).
Result:
ChopSync frequency is doubled during standby because CHOPSYNC_DIV is halfed.
Mixed Decay
Configuration for
TMC23x/24x
ChopSync
Configuration for
TMC23x/24x
Stepper Drivers
Doubling
ChopSync
Frequency
during Standstill