stk672-070-e Sanyo Semiconductor Corporation, stk672-070-e Datasheet - Page 9

• Manufacturer Part Number: stk672-070-e
• Description: Unipolar Constant-current Chopper External Excitation Pwm Circuit With Built-in Microstepping Controller Stepping Motor Driver Sine Wave Drive Output Current 1.5a No Heat Sink*
• Manufacturer: Sanyo Semiconductor Corporation

• M1, M2, and M3 (Excitation mode and CLK input edge timing selection)
• RESET (Resets all parts of the system.)
• Vref (Sets the current level used as the reference for constant-current detection.)
Output Pin Functions
Output Signal Functions and Timing
• A, A, B, and B (Motor phase excitation outputs)
M3
1) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure
1) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure
2) Function:
3) Notes: When power is first applied to this hybrid IC, Vref must be established by applying a reset. Applications
1) Pin circuit type: Analog input structure
2) Function:
1) Function:
2) Function:
3) Valid mode setting timing: Applications must not change the mode in the period 5μs before or after a CLK signal
1
0
- In the 4 phase and 2 phase excitation modes, a 3.75μs (typical) interval is set up between the A and A and B and
M2
M1
Hybrid IC internal setting state
Pin No.
- Constant-current control can be applied to the motor excitation current at 100% of the rated current by applying a
- Applications can apply constant-current control proportional to the Vref voltage, with this value of 2.5V as the
B output signal transition times.
- All circuit states are set to their initial values by setting the RESET pin low. (Note that the pulse width must be
voltage less than the control system power supply voltage V CC 2 minus 2.5V.
upper limit.
14
at least 10μs.)
At this time, the A and B phases are set to their origin, regardless of the excitation mode. The output current
goes to about 71% after the reset is released.
1-2 phase excitation
2 phase excitation
must apply a power on reset when the V CC 2 power supply is first applied.
Phase excitation clock
Mode switching clock
0
0
System clock
Symbol
Mode setting
MOI
CLK input
W1-2 phase excitation
1-2 phase excitation
rising or falling edge.
Phase excitation origin monitor
0
1
Function
Mode Setting Acquisition Timing
STK672-070-E
2W1-2 phase excitation
M1 to M3
W1-2 phase excitation
1
0
Standard CMOS structure
Mode switching timing
Pin circuit type
Excitation counter up/down
2W1-2 phase excitation
4W1-2 phase excitation
1
1
Phase switching clock edge timing
Rising and falling edges
Rising edge only
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