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 
4. Input Filtering
Input signals can be noisy due to long cables and circuit paths. To prevent jamming, every input
pin provides a Schmitt trigger. Additionally, several signals are passed through a digital filter.
Particular input pins are separated into four filtering groups. Each group can be programmed
individually according to its filter characteristics. In this chapter informed on the digital filtering
feature of TMC4361A is provided; and how to separately set up the digital filter for input pins.
Input Filtering Groups
Pin Names
Type
Remarks
A_SCLK
B_SDI
N
ANEG_NSCLK
BNEG_NSDI
NNEG
Inputs
Encoder interface input pins.
STOPL
HOME_REF
STOPR
Inputs
Reference input pins.
START
Input
START input pin.
SDODRV_SCLK
SDIDRV_NSCLK
Inputs
Master clock input interface pins for serial
encoder.
STPIN
DIRIN
Inputs
Step/Dir interface inputs.
Table 6: Input Filtering Groups (Assigned Pins)
Register Names
Register Names
Register Address
Remarks
INPUT_FILT_CONF
0x03
RW
Filter configuration for all four input groups.
Table 7: Input Filtering (Assigned Register)
Every filtering group can be configured separately with regard to input sample rate
and digital filter length.
The following groups exist:
 Encoder interface input pins.
 Reference input pins.
 Start input pin.
 Master clock input pins of encoder output interface.
 Step/Dir input pins.
NOTE:
 Differentiated handling for Step/Dir input pins is necessary, as explained on the
following pages.
Input Filter
Assignment