TMC4330A Datasheet | Document Revision 1.01 • 2017-JAN-12
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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 TMC4330A 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
Inputs
Encoder interface input pins.
ANEG_NSCLK
BNEG_NSDI
NNEG
STOPL
HOME_REF
Inputs
Reference input pins.
STOPR
START
Input
START input pin.
STPIN
DIRIN
Inputs
Step/Dir interface inputs.
Table 6: Input Filtering Groups (Assigned Pins)
Register Names
Register Names
Remarks
Register Address
0x03 RW
INPUT_FILT_CONF
Filter configuration for all four input groups.
Table 7: Input Filtering (Assigned Register)
Input Filter
Assignment
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.
Step/Dir input pins.
NOTE:
For the correct set-up of the INPUT_FILT_CONF register 0x03, please check
section 14.4. , page 128.
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