AMIS-30522 Datasheet, PDF (11/28 Pages) AMI SEMICONDUCTOR – Micro-stepping Motor Driver

AMIS-30522 Micro-stepping Motor Driver
Data Sheet
Iy
Start = 0
Step 1
Step 2
Step 3
Ix
Iy
Start = 0
Step 1
Ix ^{Step 2}
Step 3
1/4^th micro step
SM[2:0] = 011
Uncompensated Half Step
SM[2:0] = 101
PC20070604.5
Figure 8: Translator Table: Circular and Square
8.3.2. Direction
The direction of rotation is selected by means of following combination of the DIR input pin and the SPI-controlled direction bit
<DIRCTRL>. (Table 16: SPI Control Register 1)
8.3.3. NXT input
Changes on the NXT input will move the motor current one step up/down in the translator table. Depending on the NXT-polarity bit
<NXTP> (Table 16: SPI Control Register 1), the next step is initiated either on the rising edge or the falling edge of the NXT input.
t_{NXT_HI}
t_{NXT_LO}
NXT
0,5 VCC
t_{DIR_SET}
t_{DIR_HOLD}
DIR
VALID
Figure 9: NXT-input Timing Diagram
PC20070609.1
Table 11: Timing Table NXT Pin
Symbol
Parameter
t_{NXT_HI}
NXT minimum, high pulse width
t_{NXT_LO}
NXT minimum, low pulse width
t_{DIR_SET}
NXT hold time, following change of DIR
t_{DIR_HOLD}
NXT hold time, before change of DIR
Min.
2
2
500
500
Typ.
Max.
Unit
µs
µs
µs
µs
AMI Semiconductor – June 2007, M-20684-001
11
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