L6480 datasheet(45/73 Pages) STMICROELECTRONICS

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L6480

Programming manual

Doc ID 023278 Rev 3

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9.1.6

DEC

The DEC register contains the speed profile deceleration expressed in step/tick2 (format

unsigned fixed point 0.40).

In order to convert the DEC value in step/s2 the following formula can be used:

Equation 6

where DEC is the integer number stored in the register and tick is 250 ns.

The available range is from 14.55to 59590 step/s2 with a resolution of 14.55 step/s2.

When the device is working in infinite acceleration mode this value is ignored.

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).

9.1.7

MAX_SPEED

The MAX_SPEED register contains the speed profile maximum speed expressed in

step/tick (format unsigned fixed point 0.18).

In order to convert it in step/s, the following formula can be used:

Equation 7

where MAX_SPEED is the integer number stored in the register and tick is 250 ns.

The available range is from 15.25 to 15610 step/s with a resolution of 15.25 step/s.

9.1.8

MIN_SPEED

The MIN_SPEED register contains the following parameters:

The MIN_SPEED parameter contains the speed profile minimum speed. Its value is

expressed in step/tick and to convert it in step/s the following formula can be used:

Equation 8

where MIN_SPEED is the integer number stored in the register and tick is the ramp 250 ns.

step/s

[] DEC 2

–

⋅

tick

-------------------------------

step/s

[] MAX_SPEED 2

–

⋅

tick

--------------------------------------------------------

Table 13.

MIN_SPEED register

Bit 12

Bit 11

Bit 10

Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

LSPD_OPT

MIN_SPEED

step/s

[] MIN_SPEED 2

–

⋅

tick

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