TMC424 Datasheet – (V1.04 / 2015-JUL-01)

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Copyright © 2011 TRINAMIC Motion Control GmbH & Co. KG

Encoder: 125 lines

Encoder: 50 lines (200 steps per rotation)

11

N Polarity for Selected Interface

0 = active low (default)

1 = active high

When changing the polarity, please be aware that a single clear on N Event might be

triggered, and thus should not be initiated in the same write access.

10

Hold on N for Selected Interface

0 = no hold (default)

1 = active: Encoder counter freezes during 0 channel event.

9

Clear on N Event for Selected Interface

0 = no clear (default)

1 = active

When switched to active, then it depends on bit 8, if a clear event is issued only once, or

always when the N channel becomes active.

8

N Trigger Selection

0 = only at next N signal (default)

1 = always at N signal

The clear event last until the N signal goes inactive again. If earlier termination is desired,

i.e. to preset the encoder counter to a different value, disable “Clear on N” prior to

changing the position register.

7

add or sub register for each step (CW = looking onto the axis)

0= add for CW, sub for CCW (default)

1= add for CCW, sub for CW

6…0

Reserved

Table 6: SPI Datagram Prescaler

7.2 Encoder Interface Hold Register Operation

To read the actual contents of the position register or to preset the position register the following

command is to be used:

Bit

Encoder Interface Control (Read/Preload Encoder Hold Register)

31…28

“0000” Register Address

27…25

Select Encoder Hold Register

100 = Hold register in encoder interface 1

101 = Hold register in encoder interface 2

110 = Hold register in encoder interface 3

24

Read or Preload Selection

0 = Read encoder hold register

1 = Preload encoder hold register

23…0

Encoder Hold Register Data

Table 7: SPI Datagram Hold Register