AMIS30542C5421RG ON Semiconductor, AMIS30542C5421RG Datasheet - Page 12

• Manufacturer Part Number: AMIS30542C5421RG
• Description: IC MOTOR DVR MICRO STEP 32QFP
• Manufacturer: ON Semiconductor
• Type: Micro Stepping Motor Driverr

Specifications of AMIS30542C5421RG

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: 2.2A
• Voltage - Supply: 6 V ~ 30 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-VSQFP
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 6 V to 30 V
• Supply Current: 8 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Automatic Duty Cycle Adaptation
duty cycle of the PWM is adapted automatically to > 50%
to maintain the requested average current in the coils. This
Step Translator and 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] (see Table 14 SPI Control
Parameter Overview ) 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
mode, the translator jumps to position 0* of the
Table 9. SQUARE TRANSLATOR TABLE FOR FULL STEP AND UNCOMPENSATED HALF STEP
In case the supply voltage is lower than 2*Bemf, then the
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
< 50%
PWM
Uncompensated Half Step
Actual value
101
0*
1
2
3
4
5
6
7
Figure 9. Automatic Duty Cycle Adaption
Duty Cycle > 50%
Stepmode ( SM[2:0] )
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process is completely automatic and requires no additional
parameters for operation. The over−all current−ripple is
divided by two if PWM frequency is doubled (see Table 14
SPI Control Parameter Overview PWMF)
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 10 lists the
output current vs. the translator position.
projected approximately on a circle in the (I
There are, however, two exceptions: uncompensated half
step and full step. In these step modes the currents are not
regulated to a fraction of I
regulated at 100%. In the (I
projected on a square. Table 9 lists the output current vs. the
translator position for these cases.
As shown in Figure 10 the output current−pairs can be
Full Step
110
−
1
−
2
−
3
−
0
Duty Cycle < 50%
max
x
, I
but are in all intermediate steps
Set value
Coil x
y
−100
−100
−100
100
100
100
) plane the current−pairs are
0
0
% of I
t
max
Coil y
x
−100
−100
−100
100
100
100
, I
0
0
y
) plane.