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参数资料
| 型号： | 4255 |
| 厂商： | Allegro MicroSystems, Inc. |
| 英文描述： | OSC 5V 14PIN TTL |
| 中文描述： | 8位微控制器 |
| 文件页数： | 3/8页 |
| 文件大小： | 142K |
| 代理商： | 4255 |
4255
8-BIT
MICROCONTROLLER
www.allegromicro.com
format, reset, 1/8th vs 1/16th sub-steps, etc. Note that
during power up, shift clock (SCLK) is sampled for a pull-
up or pull-down resistor to establish the fractional step
limit. A pull up sets up a 1/8th-step format (for the
A3955) and pull down sets up 1/16th-operation (for the
A3957).
Table 2 lists the microcontroller terminal descriptions
and provides the essence of the circuit operation (a
schematic illustrating a typical stepper design follows). A
brief description of the microcontroller I/O should clarify
the connections of the various elements of the drive
electronics.
FUNCTIONAL DESCRIPTION (cont’d)
Table 1 — Controller/sequencer IC operational logic
Binary inputs
Operating mode
Comments
DIR
MS2
MS1
MS0
(Command executed on L
→ H of CLK)
(Applicable power ICs)
0000
CW, Full step (single-phase)
A3955/57
0001
CW, Half step (constant torque)
A3955/57
0010
CW, 1/4 step (constant torque)
A3955/57
0011
CW, 1/8th step (constant torque)
A3955/57
0100
CW, 1/16th step (constant torque)
A3957 only
0101
Disable A3955/57 holding torque
At present position
0110
Enable A3955/57 holding torque
From present position
0111
Reset A4255 sequencer IC
A3955/57
1000
CCW, full step (single-phase)
A3955/57
1001
CCW, half step (constant torque)
A3955/57
1010
CCW, 1/4 step (constant torque)
A3955/57
1011
CCW, 1/8th step (constant torque)
A3955/57
1100
CCW, 1/16th step (constant torque)
A3957 only
1101
Disable A3955/57 holding torque
At present position
1110
Enable A3955/57 holding torque
From present position
1111
Reset A4255 sequencer IC
A3955/57
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 4255 | 制造商:3M Electronic Products Division 功能描述:RESPIRATOR A2P2 |
| 42550 | 制造商:Desco Industries Inc 功能描述:MAT 3-LYR VNYL BL .125''X16''X24 制造商:Desco Industries Inc 功能描述:MAT, STATFREE Z2, 3-LAYER VINYL, BLUE, 0.125x16x24 |
| 425-50,8MM(R06933) | 制造商:3M Electronic Products Division 功能描述:Aluminium adhesive tape 3M 425 50 mm |
| 425-5020-530 | 制造商:TERADYNE 功能描述:HEADER CONNECTOR,PCB MNT,RECEPT,80 CONTACTS,PIN,0.100 PITCH,PC TAIL TERMINAL |
| 42550X55 | 制造商:3M Electronic Products Division 功能描述:425 aluminium foil tape,55m Lx50mm W |
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