AMIS-30624 AMI Semiconductor, Inc., AMIS-30624 Datasheet - Page 15

• Manufacturer Part Number: AMIS-30624
• Description: I2c Microstepping Motordriver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30624 I
13.5.1. Position Ranges
A position is coded by using the binary two’s complement format. According to the positioning commands used and to the chosen
stepping mode, the position range will be as shown in Table 11.
Table 11: Position Range
Command
SetPosition
When using the command SetPosition, although coded on 16 bits, the position word will have to be shifted to the left by a certain
number of bits, according to the stepping mode.
13.5.2. Secure Position
A secure position can be programmed. It is coded in 11-bits, thus having a lower resolution than normal positions, as shown in
Table 12. See also the command GotoSecurePosition.
Table 12: Secure Position
Important Notes:
13.5.3. Shaft
A shaft bit which can be programmed in
counter-clockwise rotation (an outer or an inner motion for linear actuators):
AMI Semiconductor – Apr. 2007, Rev 3.1, M-20664-003
www.amis.com
(1)
(2)
• Shaft = 0 ⇒ MOTXP is used as positive pin of the X coil, while MOTXN is the negative one
• Shaft = 1 ⇒ opposite situation.
T
The resolution of the secure position is limited to 9 bit at start-up. The OTP register is copied in RAM as illustrated below. SecPos1 and SecPos0 = 0.
he secure position is disabled in case the programmed value is the reserved code “10000000000” (0x400 or most negative position).
SecPos10
SecPos10
1/16
1/4
1/8
Stepping Mode
Half-stepping
th
th
th
microstepping
microstepping
microstepping
2
C Microstepping Motordriver
SecPos9
SecPos9
1/16
1/4
1/8
Stepping Mode
Half stepping
th
th
th
microstepping
microstepping
microstepping
OTP
SecPos8
SecPos8
or with command SetMotorParam, defines whether a positive motion is a clockwise or
-16384 to +16383
-32768 to +32767
15
-4096 to +4095
-8192 to +8191
Position Range
SecPos2
SecPos2
Secure Position Resolution
SecPos1
32 micro-steps (1/16
16 micro-steps (1/8
8 micro-steps (1/4
Full Range Excursion
4 half-steps
16384 micro-steps
32768 micro-steps
65536 micro-steps
8192 half-steps
SecPos0
th
th
)
th
)
)
RAM
OTP
Data Sheet
Number of Bits
13
14
15
16