Datasheet

DocID16737 Rev 7 43/73
L6470 Programming manual
73
9.1.6 DEC
The DEC register contains the speed profile deceleration expressed in step/tick
2
(format
unsigned fixed point 0.40).
In order to convert DEC value in step/s
2
, 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 14.55 to 59590 step/s2 with a resolution of 14.55 step/s2.
Any attempt to write the register when the motor is running causes the command to be
ignored and the NOTPERF_CMD flag to rise (see Section 9.1.22 on page 55).
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.
The available range is from 0 to 976.3 step/s with a resolution of 0.238 step/s.
step/s
2

DEC 2
40–

tick
2
-----------------------------=
step/s
MAX_SPEED 2
18–

tick
-----------------------------------------------------=
Table 11. 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
24–

tick
---------------------------------------------------=