L6472 datasheet(45/69 Pages) STMICROELECTRONICS

45 / 69 page

L6472

Programming manual

Doc ID 022729 Rev 1

45/69

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

and 7.3 for details):

The available range for both parameters is from 0.5 µs to 8 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).

9.1.12

TON_MIN

This parameter is used by the current control system when current mode operation is

selected.

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.

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).

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

0.5 µs

1 µs

7.5 µs

8 µs

Table 14.

Minimum ON time

Time

0.5 µs

1 µs

63.5 µs

64 µs

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