Datasheet

DocID022729 Rev 3 45/70

L6472 Programming manual

9.1.11 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

on page 34 and 7.3 on page 36 for details):

The available range for both parameters is from 2 µs to 32 µs.

Any attempt to write to the register when the motor is running causes the command to be

ignored and NOTPERF_CMD to rise (see Section 9.1.19 on page 52).

9.1.12 TON_MIN

The TON_MIN register contains the minimum ON time value used by the current control

system (see Section 7.2 on page 34).

The available range for both parameters is from 0.5 µs to 64 µs.

Any attempt to write to the register when the motor is running causes the command to be

ignored and the NOTPERF_CMD to rise (see Section 9.1.19).

Table 13. T_FAST register

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

TOFF_FAST FAST_STEP

Table 14. 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 30 µs

1 1 1 1 32 µs

Table 15. Minimum ON time

TON_MIN [6 … 0] Time

0 0 0 0 0 0 0 0.5 µs

0 0 0 0 0 0 1 1 µs

…

1 1 1 1 1 1 0 63.5 µs

1 1 1 1 1 1 1 64 µs