L6480 datasheet(48/73 Pages) STMICROELECTRONICS

48 / 73 page

Programming manual

L6480

48/73

Doc ID 023278 Rev 3

9.1.14

FN_SLP_DEC

The FN_SLP_DEC register contains the BEMF compensation curve slope that is used when

the speed is greater than the intersect speed during deceleration (Section 7.4 for details). Its

value is expressed in s/step and the available range is from 0 to 0.004 with a resolution of

0.000015.

When ST_SLP, FN_SLP_ACC and FN_SLP_DEC parameters are set to zero, no BEMF

compensation is performed.

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

ignored and the NOTPERF_CMD flag to rise (Section 9.1.24).

9.1.15

K_THERM

The K_THERM register contains the value used by the winding resistance thermal drift

compensation system (Section 7.6).

The available range is from 1 to 1.46875 with a resolution of 0.03125, as shown in Table 16.

9.1.16

ADC_OUT

The ADC_OUT register contains the result of the analog to digital conversion of the ADCIN

pin voltage; the result is available even if the supply voltage compensation is disabled.

Any attempt to write to the register causes the command to be ignored and the

NOTPERF_CMD flag to rise (Section 9.1.24).

Table 16.

Winding resistance thermal drift compensation coefficient

K_THERM [3..0]

Compensation coefficient

1.03125

1.4375

1.46875

Table 17.

ADC_OUT value and motor supply voltage compensation feature

VADCIN / VREG

ADC_OUT

[4..0]

Compensation

coefficient

Greater than VS,nom + 50%

> 24/32

0.65625

VS,nom + 50%

24/32

1000

0.65625

VS,nom

16/32

0000

VS,nom – 50%

8/32

1000

1.968875

Lower than VS,nom – 50%

< 8/32

1.968875

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