DRV8711_15 Datasheet, PDF (13/44 Pages) Texas Instruments – DRV8711 Stepper Motor Controller IC

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DRV8711
SLVSC40E – JUNE 2013 – REVISED MARCH 2015
When driving in PWM mode, the chopping current is calculated as follows:
ICHOP
=
2.75V · TORQUE
256 · ISGAIN · RISENSE
(1)
Where TORQUE is the setting of the TORQUE bits, and ISGAIN is the programmed gain of the ISENSE
amplifiers (5, 10, 20, or 40).
7.3.3 Microstepping Indexer
Built-in indexer logic in the DRV8711 allows a number of different stepping configurations. The MODE bits in the
CTRL register are used to configure the stepping format as shown in Table 3.
MODE3
0
0
0
0
0
0
0
0
1
Table 3. Microstepping Indexer Logic
MODE2
0
0
0
0
1
1
1
1
0
MODE1
0
0
1
1
0
0
1
1
0
MODE0
0
1
0
1
0
1
0
1
0
STEP MODE
Full-step (2-phase excitation)
with 71% current
1/2 step
1/4 step
1/8 step
1/16 step
1/32 step
1/64 step
1/128 step
1/256 step
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