L6474 Datasheet, PDF (34/51 Pages) STMicroelectronics – easySPIN – fully integrated microstepping motor driver

Programming manual
Table 11. Torque regulation register
TVAL [6..0]
0000000
0000001
L6474
Output current amplitude
31.25 mA
62.5 mA
9.1.5
1111110
1111111
3.969 A
4A
T_FAST
The T_FAST register contains the maximum fast decay time (TOFF_FAST) and the
maximum fall step time (FALL_STEP) used by the current control system (see Sections 7.2
and 7.3 for details):
Table 12. T_FAST register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TOFF_FAST
FAST_STEP
The available range for both parameters is from 0.5 µs to 8 µs.
Table 13.
0
0
Maximum fast decay times
TOFF_FAST [3..0]
FAST_STEP[3..0]
0
0
0
0
0
1
Fast decay time
0.5 µs
1 µs
9.1.6
1
1
1
0
1
1
1
1
7.5 µs
8 µs
Any attempt to write to the register when the outputs are enabled causes the command to
be ignored and the NOTPERF_CMD to rise (see Section 9.1.13).
TON_MIN
The TON_MIN register contains the minimum ON time value used by the current control
system (see Section 7.2).
The available range for both parameters is from 0.5 µs to 64 µs.
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