TMC4330A Datasheet | Document Revision 1.01 • 2017-JAN-12
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Input Filtering Examples
The following three examples depict input pin filtering of three different input filtering groups.
i
i
After passing Schmitt trigger, voltage levels are compared to internal signals, which are processed by
the motion controller.
The sample points are depicted as green dashed lines.
Example 1:
Reference Input
Pins
In this example every second clock cycle is sampled. Two sampled input
bits must be equal to receive a valid input voltage.
CLK
HOME
internal
home signal
STOPL
internal left
stop signal
Figure 14: Reference Input Pins: SR_REF = 1, FILT_L_REF = 1
Example 2:
This example shows the START input pattern at every fourth clock cycle:
START Input Pin
CLK
START
internal Start
input signal
START
internal Start
input signal
Figure 15: START Input Pin: SR_S = 2, FILT_L_S = 0
Example 3:
Encoder
This example shows every clock cycle bit. Eight sampled input bits must be
equal to receive a valid input voltage.
Interface Input
Pins
CLK
B_SDI
internal B
input signal
N
internal N
input signal
Figure 16: Encoder Interface Input Pins: SR_ENC_IN = 0, FILT_L_ENC_IN = 7
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