POWERSTEP01 datasheet(58/92 Pages) STMICROELECTRONICS

58 / 92 page

Programming manual

powerSTEP01

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DocID025022 Rev 5

11.1.16

TVAL_HOLD, TVAL_RUN, TVAL_ACC and TVAL_DEC

These registers are specific for current mode driving (see Section 9 on page 43).

The TVAL_HOLD register contains the reference voltage that is assigned to the torque

regulation DAC when the motor is stopped.

The TVAL_RUN register contains the reference voltage that is assigned to the torque

regulation DAC when the motor is running at constant speed.

The TVAL_ACC register contains the reference voltage that is assigned to the torque

regulation DAC during acceleration.

The TVAL_DEC register contains the reference voltage that is assigned to the torque

regulation DAC during deceleration.

The available range is from 7.8 mV to 1 V with a resolution of 7.8 mV, as shown in Table 16.

11.1.17

T_FAST

This register is specific for current mode driving (see Section 9).

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 (Section 9.2 on

page 44 and Section 9.3 on page 46 for details):

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

Table 18. Torque regulation by TVAL_HOLD, TVAL_ACC, TVAL_DEC and TVAL_RUN

registers

TVAL_X [6…0]

Peak reference voltage

00000

7.8 mV

00000

15.6 mV

11111

992.2 mV

11111

1 V

Table 19. T_FAST register

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

TOFF_FAST

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