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AMIS-30522 Folha de dados(PDF) 9 Page - AMI SEMICONDUCTOR |
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AMIS-30522 Folha de dados(HTML) 9 Page - AMI SEMICONDUCTOR |
9 / 28 page AMIS-30522 Micro-stepping Motor Driver Data Sheet 8.2.2. Automatic Duty Cycle Adaptation In case the supply voltage is lower than 2*Bemf, then the duty cycle of the PWM is adapted automatically to >50% to maintain the requested average current in the coils. This 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 (Table 16: SPI Control Register 1). Actual value Duty Cycle < 50% Duty Cycle >50% Duty Cycle < 50% t Icoil Set value TPWM PC20070604.2 Figure 7: Automatic Duty Cycle Adaption 8.3 Step Translator 8.3.1. Step Mode The step translator provides the control of the motor by 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. One out of seven possible stepping modes can be selected through SPI-bits SM[2:0] (Table 28: 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 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 10 lists the output current vs. the translator position. As shown in Figure 8 the output current-pairs can be projected approximately on a circle in the (Ix,Iy) plane. 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 (Ix,Iy) plane the current-pairs are projected on a square. Table 9 lists the output current vs. the translator position for this case. Table 9: Square Translator Table for Uncompensated Half Step SM[2:0] = 101 Stepmode ( SM[2:0] ) % of Imax 101 Uncompensated Half Step Coil x Coil y 0* 0 100 1 100 100 2 100 0 3 100 -100 4 0 -100 5 -100 -100 6 -100 0 7 -100 100 9 AMI Semiconductor – June 2007, M-20684-001 www.amis.com |
Nº de peça semelhante - AMIS-30522 |
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Descrição semelhante - AMIS-30522 |
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