Datasheet

L6474 Programming manual
Doc ID 022529 Rev 3 35/52
9.1.5 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 Section 7.2
and Section 7.3 for details):
Table 12. T_FAST register
The available range for both parameters is from 2 µs to 32 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).
9.1.6 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.
Table 11. Torque regulation register
TVAL [6..0] Output current amplitude
0 0 0 0 0 0 0 31.25 mA
0 0 0 0 0 0 1 62.5 mA
… … … … … … … …
1 1 1 1 1 1 0 3.969 A
1 1 1 1 1 1 1 4 A
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
TOFF_FAST FAST_STEP
Table 13. Maximum fast decay times
TOFF_FAST [3..0]
FAST_STEP[3..0]
Fast decay time
0 0 0 0 2 µs
0 0 0 1 4 µs
… … … … …
1 1 1 0 28 µs
1 1 1 1 32 µs