User Manual

TMC5031-EVAL Manual / Firmware V1.00 (Rev. 1.00 / 2013-FEB-22) 22

www.trinamic.com

6.4.4 Chopper Configuration Dialogue

This dialogue has two tabs, one for motor 1 and the other one for motor 2. First, it is necessary to

specify the chopper mode: spreadCycle or Classic.

Figure 6.14 Choose chopper mode

spreadCycle (standard mode) and classic chopper (constant off time with fast decay time) have to be

configured differently:

- For spreadCycle configuration the hysteresis has to be defined by setting a start value (HSTRT)

and an end value (HEND).

- The classic chopper needs a fast decay time setting (TFD) and a specified offset (OFFSET).

Parameters with more than one bit have value fields; parameters with just one bit can be set by ticking

them. Please refer to the chopper configuration register below for detailed information.

Figure 6.15 Chopper configuration dialogue (spreadCycle or classic)

0X6C, 0X7C: CHOPCONF – CHOPPER CONFIGURATION

Bit

Name

Function

Comment

diss2g

short to GND

protection disable

0: Short to GND protection is on

1: Short to GND protection is disabled

sync3

SYNC

PWM synchronization

clock

This register allows synchronization of the chopper for

both phases of a two phase motor in order to avoid the

occurrence of a beat, especially at low motor velocities.

It is automatically switched off above VHIGH.

%0000: Chopper sync function chopSync off

%0001 … %1111:

Synchronization with f

SYNC

= f

CLK

/(sync*64)

Hint: Set TOFF to a low value, so that the chopper cycle

is ended, before the next sync clock pulse occurs. Set for

the double desired chopper frequency for chm=0, for the

desired base chopper frequency for chm=1.

sync2

sync1

sync0