stk672-632b-e Sanyo Semiconductor Corporation, stk672-632b-e Datasheet - Page 5

• Manufacturer Part Number: stk672-632b-e
• Description: 2-phase Stepping Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

Precautions
[GND wiring]
• To reduce noise on the 5V system, be sure to place the GND of C01 in the circuit given above as close as possible to
[Input pins]
• If V DD is being applied, use care that each input pin does not apply a negative voltage less than -0.3V to S.G, Pin 18,
• Do not wire by connecting the circuit pattern on the P.C.B side to Pin 7 and Pin 11 on the N.C. shown in the internal
• Apply 2.5V high level input to pins 10, 12, 13, 14, 15, and 17.
• Since the input pins do not have built-in pull-up resistors, when the open-collector type pins 10, 12, 13, 14, 15, and 17
[Current setting Vref]
• Motor current peak value I OH setting
Pin 2 and Pin 6 of the hybrid IC. Also, to achieve accurate current settings, be sure to connect Vref GND to Pin 18
(S.G) used to set the current and to the point where P.G1 and P.G2 share a connection.
and do not apply a voltage greater than or equal to V DD voltage.
block diagram.
are used as inputs, a 1 to 20kΩ pull-up resistor (to V DD ) must be used.
At this time, use a device for the open collector driver that has output current specifications that pull the voltage down
to less than 0.8V at Low level (less than 0.8V at Low level when I OL =5mA).
If the motor current is temporarily reduced, the circuit given below (STK672-632B-E, 632A-E, 630A-E : I OH >0.2A,
STK672-642B-E, 640B-E, 640A-E: I OH >0.3A) is recommended.
I OH =(Vref÷4.9) ÷Rs
The value of 4.9 in Equation above represents the Vref voltage as divided by a circuit inside the control IC.
Vref=(R02÷ (R01+R02)) ×5V(or 3.3V)
Rs is an internal current detection resistor value of the hybrid IC.
Rs=0.141Ω when using the STK672-632B-E, 632A-E, 630A-E
Rs=0.089Ω when using the STK672-642B-E, 640B-E, 640A-E
R3
I OH
0
5V
R02
R01
Vref
STK672-632B-E
R3
5V
R02
R01
Vref
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