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STK672-440B-E bảng dữ liệu(PDF) 10 Page - ON Semiconductor

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Giải thích chi tiết về linh kiện  2-phase Stepping Motor Driver
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STK672-440B-E
No.A1734-10/26
Usage Notes
1. I/O Pins and Functions of the Control Block
[Pin description]
HIC pin
Pin Name
Function
7
MOI
Output pin for the excitation monitor
19
Vref
Current value setting
10
MODE1
11
MODE2
17
MODE3
Excitation mode selection
12
CLOCK
External CLOCK (motor rotation instruction)
13
CWB
Sets the direction of rotation of the motor axis
14
RESETB
System reset
15
ENABLE
Motor current OFF
16
FAULT1
8
FAULT2
Motor terminal open/Overcurrent/over-heat detection output
Description of each pin
[CLOCK (Phase switching clock)]
Input frequency: DC-20kHz (when using both edges) or DC-50kHz (when using one edge)
Minimum pulse width: 20
μs (when using both edges) or 10μs (when using one edge)
Pulse width duty: 40% to 50%
Both edge, single edge operation
M3:1 The excitation phase moves one step at a time at the rising edge of the CLOCK pulse.
M3:0 The excitation phase moves alternately one step at a time at the rising and falling edges of the CLOCK pulse.
[CWB (Motor direction setting)]
When CWB=0: The motor rotates in the clockwise direction.
When CWB=1: The motor rotates in the counterclockwise direction.
Do not allow CWB input to vary during the 7
μs interval before and after the rising and falling edges of CLOCK input.
[ENABLE (Forcible OFF control of excitation drive output A, AB, B, and BB, and selecting operation/hold status
inside the HIC)]
ENABLE=1: Normal operation
When ENABLE=0: Motor current goes OFF, and excitation drive output is forcibly turned OFF.
The system clock inside the HIC stops at this time, with no effect on the HIC even if input pins other than RESET
input vary. In addition, since current does not flow to the motor, the motor shaft becomes free.
If the CLOCK signal used for motor rotation suddenly stops, the motor shaft may advance beyond the control position
due to inertia. A SLOW DOWN setting where the CLOCK cycle gradually decreases is required in order to stop at the
control position.
[MODE1, MODE2, and MODE3 (Selecting the excitation mode, and selecting one edge or both edges of the CLOCK)]
Excitation select mode terminal (See the sample application circuit for excitation mode selection), selecting the
CLOCK input edge(s).
Mode setting active timing
Do not change the mode within 7
μs of the input rising or falling edge of the CLOCK signal.
[RESETB (System-wide reset)]
The reset signal is formed by the power-on reset function built into the HIC and the RESETB terminal.
When activating the internal circuits of the HIC using the power-on reset signal within the HIC, be sure to connect Pin
14 of the HIC to VDD.


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