LC898240_16 Datasheet, PDF (9/23 Pages) ON Semiconductor – High Efficient Stepper Motor Controller

REGISTER DESCRIPTION
LC898240
E2PROM
Register Map
Addre
ss
from
to
0000h 002Fh
0030h
0040h
03B0h
03C0h
0730h
0740h
0AB0h
0AC0h
0E30h
0E40h
11B0h
11C0h
1530h
1540h
18B0h
18C0h
1C30h
1C40h
1FB0h
003Fh
03AFh
03BFh
072Fh
073Fh
0AAFh
0ABFh
0E2Fh
0E3Fh
11AFh
11BFh
152Fh
153Fh
18AFh
18BFh
1C2Fh
1C3Fh
1FAFh
1FFFh
Description
initial default settings for the
main chip registers
unused (filled by FFh)
acceleration curve #0
unused (filled by FFh)
acceleration curve #1
unused (filled by FFh)
acceleration curve #2
unused (filled by FFh)
acceleration curve #3
unused (filled by FFh)
acceleration curve #4
unused (filled by FFh)
acceleration curve #5
unused (filled by FFh)
acceleration curve #6
unused (filled by FFh)
acceleration curve #7
unused (filled by FFh)
acceleration curve #8
unused (filled by FFh)
Initial Default Settings
After the reset is released, the data written in the address
0000h to 002Fh of the E2PROM will be downloaded to
the same address of the main chip registers. This
function allows to set the initial default value for the
registers. The register setting can be overwritten
through the SPI.
Acceleration Curve
The E2PROM has the registers for nine acceleration
curves with 440 steps for each. The step interval time is
represented in 16-bit code.
𝑇𝑇_{𝑆𝑆𝑆𝑆𝑆𝑆} = (𝐷𝐷_{í µí±…í µí±…í µí±…í µí±…í µí±…í µí±} + 1) × 𝑇𝑇_{𝐶𝐶𝐶𝐶𝐶𝐶}
Where,
𝑇𝑇_{𝑆𝑆𝑆𝑆𝑆𝑆}: step interval time [s]
𝐷𝐷_{í µí±…í µí±…í µí±…í µí±…í µí±…í µí±}: E2PROM data. MSB in even address,
and LSB in odd address.
𝑇𝑇_{𝐶𝐶𝐶𝐶𝐶𝐶}: clock period [s]
The end of the acceleration curve sequence is set by
𝐷𝐷_{í µí±…í µí±…í µí±…í µí±…í µí±…í µí±} = FFFFh, and the motor rotation is kept in
the constant speed.
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