STK672-080 Sanyo Semicon Device, STK672-080 Datasheet - Page 9

• Manufacturer Part Number: STK672-080
• Description: Stepping Motor Driver (Sine Wave Drive) Output Current : 2.8 A (No Heat Sink)
• Manufacturer: Sanyo Semicon Device

• 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)
• M1, M2, and M3 (Excitation mode and CLK input edge timing selection)
Function:
Valid mode setting timing: Applications must not change the mode in the period 5 µs before or after a CLK signal rising
M3
Pin No.
Pin circuit type: Built-in pull-up resistor (20 kΩ, typical) CMOS Schmitt trigger structure
Function
—All circuit states are set to their initial values by setting the RESET pin low. (Note that the pulse width must be at
Notes: When power is first applied to this hybrid IC, Vref must be established by applying a reset. Applications must
Pin circuit type: Analog input structure
Function
—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 2.5 V as the
Function
—In the 4 phase and 2 phase excitation modes, a 3.75 µs (typical) interval is set up between the A and A and B and B
Pin circuit type: Built-in pull-up resistor (20 kΩ, typical) CMOS Schmitt trigger structure
14
1
0
least 10 µs.)
voltage less than the control system power supply voltage V
upper limit.
output signal transition times.
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.
Hybrid IC internal setting state
M2
M1
apply a power on reset when the V
1-2 phase excitation
2 phase excitation
Phase excitation clock
Symbol
Mode switching clock
MoI
0
0
System clock
Mode setting
CLK input
Phase excitation monitor
or falling edge.
W1-2 phase excitation
Function
1-2 phase excitation
0
1
Mode Setting Acquisition Timing
CC
2 power supply is first applied.
Standard CMOS structure
2W1-2 phase excitation 4W1-2 phase excitation
W1-2 phase excitation
Pin circuit type
M1 to M3
STK672-080
1
0
Mode switching timing
CC
2 minus 2.5 V.
2W1-2 phase excitation
Excitation counter up/down
1
1
Phase switching clock edge timing
Rising and falling edges
Rising edge only
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