AMIS30512C5122RG ON Semiconductor, AMIS30512C5122RG Datasheet - Page 11

• Manufacturer Part Number: AMIS30512C5122RG
• Description: IC MOTOR DVR MICRO STEP 24SOIC
• Manufacturer: ON Semiconductor

Specifications of AMIS30512C5122RG

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: 800mA
• Voltage - Supply: 6 V ~ 30 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Step Translator
Step Mode
means of SPI register Stepmode: SM[2:0], SPI register
DIRCNTRL, and input pins DIR and NXT. It is translating
consecutive steps in corresponding currents in both motor
coils for a given step mode.
through SPI−bits SM[2:0] (Table 26: SPI Control Parameter
Overview SM[2:0]) After power−on or hard reset, the
coil−current translator is set to the default 1/32
micro−stepping at position ‘0’. Upon changing the step
Table 8. Square Translator Table for Full Step and Uncompensated Half Step
The step translator provides the control of the motor by
One out of seven possible stepping modes can be selected
MSP[6:0]
000 0000
001 0000
010 0000
011 0000
100 0000
101 0000
110 0000
111 0000
Icoil
Duty Cycle
T PWM
< 50%
Uncompensated Half−Step
Actual value
101
0*
1
2
3
4
5
6
7
Figure 8. Automatic Duty Cycle Adaptation
Duty Cycle > 50%
Stepmode ( SM[2:0] )
http://onsemi.com
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mode, the translator jumps to position 0* of the
corresponding stepping mode. When remaining in the same
step mode, subsequent translator positions are all in the same
column and increased or decreased with 1. Table 9 lists the
output current versus the translator position.
projected approximately on a circle in the (I
There is, however, one exception: uncompensated half step.
In this step mode the currents are not regulated to a fraction
of Imax but are in all intermediate steps regulated at 100
percent. In the (I
on a square. Table 8 lists the output current versus the
translator position for this case.
As shown in Figure 9 the output current−pairs can be
Full Step
110
Duty Cycle < 50%
0*
−
1
−
2
−
3
−
x
,I
y
) plane the current−pairs are projected
Set value
Coil x
−100
−100
−100
100
100
100
0
0
% of Imax
t
x
,I
y
Coil y
) plane.
−100
−100
−100
100
100
100
0
0