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STK672-400 bảng dữ liệu(PDF) 9 Page - ON Semiconductor

tên linh kiện STK672-400
Giải thích chi tiết về linh kiện  2-phase Stepping Motor Driver
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STK672-400
No.A0751-9/19
Usage Notes
1. Input pins and functional overview
[Input pins]
Hybrid IC pin No.
Symbol
Function
Pin type
19
Vref
Current setting
Input impedance: 200k
Ω (typical)
10, 11, 13
MODE1, MODE2, MODE3
Excitation mode setting
TTL level Schmitt input
12
CLK
Phase switching clock
(speed command)
Same as the above
13
CWB
Motor direction setting
Same as the above
14
RESET
System reset
Same as the above
15
ENABLE
Motor current off
Same as the above
2. Input signal functions
[CLK (Phase switching clock)]
(1) Input frequency: DC to 50kHz
(2) Minimum pulse width: 10
μs
(3) Pulse width duty: 40 to 60%
(4) Pin circuit type: TTL level Schmitt trigger input
(5) A multi-stage noise exclusion circuit is included.
(6) Function
• M3:1
When M3 is 1:The excitation phase is advanced one step on each CLK signal rising edge.
• M3:0
When M3 is 0:The excitation phase is advanced one step alternately on each CLK signal rising or falling edge.
• Timing chart
[CWB (Motor direction setting)]
(1) Pin circuit type: TTL level Schmitt trigger input
(2) Function
• When CWB = 0: The motor turns in the clockwise direction
• When CWB = 1: The motor turns in the counterclockwise direction
(3) Note: The value of the CWB input must not be changed in the period from 7
μs before a CLK input rising or falling
edge until 7
μs after that edge.
[ENABLE (Forces the excitation drive outputs A, AB, B, and BB to the off state and selects the hybrid IC's internal
state to be operating or hold)]
(1) Pin circuit type: TTL level Schmitt trigger input
(2) Function
a) When ENABLE is 1: Normal operating state
b) When ENABLE is 0: The motor current is turned off and the excitation drive output is turned off forcibly. At
this time, the hybrid IC's system clock is stopped and the hybrid IC is not influenced by
changes to any input pins other than the reset input.
Excitation counter up/down
CLK input
System clock
Phase excitation
counter clock
Control output timing
Control output switching timing


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