L6474 datasheet(41/51 Pages) STMICROELECTRONICS

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L6474

Programming manual

Doc ID 022529 Rev 2

41/51

The TQREG bit sets if the torque regulation (see Section 7.4) is performed through the

ADCIN voltage (external) or TVAL register (internal):

The TOFF time is used by current control system. If its value is lower than the TOFF_MIN

one, the OFF time is equal to TOFF_MIN.

Any attempt to write the CONFIG register when the outputs are enabled causes the

command to be ignored and the NOTPERF_CMD flag to rise (see Section 9.1.13).

9.1.13

STATUS

When HiZ flag is high, it indicates that the bridges are in high impedance state. Enable

command makes the device exit from High Z state unless error flags forcing a High Z state

are active.

Table 25.

Programmable power bridge output slew-rate values

POW_SR [1..0]

Output Slew-rate (1) [V/ìs] (1)

See SRout_r and SRout_f parameters in the electrical characteristics Table 5 for details.

180

290

530

Table 26.

External torque regulation enable

TQREG

External torque regulation enable

Internal registers

ADC input

Table 27.

OFF time

TOFF [4..0]

OFF time

4 µs

8 µs

124 µs

Table 28.

STATUS register

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

OCD

TH_SD

TH_WRN

UVLO

WRONG_CMD

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

NOTPERF_CMD

DIR

HiZ

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