AMIS-30521 AMI Semiconductor, Inc., AMIS-30521 Datasheet - Page 11

• Manufacturer Part Number: AMIS-30521
• Description: Micro-stepping Motor Driver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30521 Micro-stepping Motor Driver
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>.
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 11: Timing Table NXT Pin
Symbol
t
t
t
t
NXT_HI
NXT_LO
DIR_SET
DIR_HOLD
AMI Semiconductor – June 2007, M-20683-001
www.amis.com
(Table 14: SPI Control Register
(Table 14: SPI Control Register
Parameter
NXT minimum, high pulse width
NXT minimum, low pulse width
NXT hold time, following change of DIR
NXT hold time, before change of DIR
NXT
DIR
1/4
SM[2:0] = 011
Start = 0
th
1), the next step is initiated either on the rising edge or the falling edge of the NXT input.
t
micro step
DIR_SET
Iy
VALID
1)
Step 1
Figure 8: Translator Table: Circular and Square
t
Step 2
DIR_HOLD
Figure 9: NXT-input Timing Diagram
Step 3
t
0,5 V
NXT_HI
Ix
CC
Uncompensated Half Step
11
SM[2:0] = 101
t
NXT_LO
Start = 0
Iy
Step 1
Step 2
Step 3
Min.
500
500
2
2
Ix
PC20070604.5
PC20070609.1
Typ.
Max.
Data Sheet
Unit
µs
µs
µs
µs