Where, Rh and Ch are the resistor and the capacitor connected to the

THLD pin. If the pin is tied low, holding torque mode is disabled and

normal torque prevails in both dynamic and idle motor states.

DCYM, TDCYD, TDCYU

DCYM and TDCYD inputs control the PWM decay modes for the

LS8292 as follows:

DCYM, TDCYD and TDCYU inputs control the PWM decay modes for

the LS8293 as follows:

Table3

DCYM

TDCYD

TDCYU

Decay Mode

1

0

x

Fast

1

1

x

Slow

0

RdCd

0

Single-Mixed

0

RdCd

RuCu

Dual-Mixed

Fast-Decay.

Phase output are enabled while inhibit outputs are

chopped in both dynamic and idle motor states.

Slow-Decay.

Inhibit output are enabled while phase outputs are

chopped in both dynamic and idle motor states.

Single-Mixed-Decay

. Following a stepping event, if the step requires

the current in a winding to decrease, fast decay is applied to the winding

for a programmable duration followed by slow decay. The duration is

given by: Tdcyd = 1.2 x RdCd, where Rd and Cd are the resistor and the

capacitor connected to the TDCYD pin.

If the step requires the current in a winding to increase, slow decay is

applied to the winding. If motor is idle, slow decay is applied to both

windings.

Dual-Mixed-Deacy.

Following a stepping event fast decay is applied to

both windings for programmable durations followed by slow decay. The

duration of the fast decay for the winding requiring lower current

following a stepping event is given by: Tdcyd = 1.2 x RdCd and the

duration of the fast decay for the winding requiring higher current

following a stepping event is given by: Tdcyu = 1.2 x RuCu. Ru and Cu

are the resistor and the capacitor connected to the TDCYU pin.

If motor is idle, slow decay is applied to both windings.

VDD

Supply voltage positive terminal.

DGND

Supply negative terminal for digital ground.

AGND

Analog ground; must be connected together with DGND on the PCB.

Table 2

DCYM

TDCYD

Decay Mode

1

0

Fast

1

1

Slow

0

RdCd

Single-Mixed

PIN ASSIGNMENT

TOP VIEW

24

1

24

2

3

4

5

6

7

8

9

10

11

12

M0

M1

DCYM

RESET/

Vref

DGND

XTLI

XTLO

HOME/

EN/

FWD

STEP/

LS8293

13

14

15

16

17

18

19

20

21

22

23

24

AGND

SENSE2

SENSE1

TDCYD

TBLNK

PHD

PHC

PHB

PHA

INH2/

INH1/

VDD

1

24

2

24

3

24

4

24

5

24

6

24

7

24

8

24

9

24

10

24

11

24

12

24

13

24

14

24

LS8292

M0

M1

DCYM

STEP/

RESET/

FWD

EN/

HOME/

XTLO

XTLI

DGND

SYNC/

TDCYU

THLD

15

24

16

24

17

24

18

24

19

24

20

24

21

24

22

24

23

24

24

24

25

24

26

24

27

24

28

24

Vrefh

Vref

AGND

SENSE2

SENSE1

TDCYD

TBLNK

PHD

PHC

PHD

PHB

PHA

INH2/

INH1/

VDD

8292-021811-3