L6474 datasheet(34/51 Pages) STMICROELECTRONICS

34 / 51 page

Programming manual

L6474

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Doc ID 022529 Rev 2

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 Sections 7.2

and 7.3 for details):

Table 12.

T_FAST register

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

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

31.25 mA

62.5 mA

3.969 A

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

0.5 µs

1 µs

7.5 µs

8 µs

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