stk672-640b-e Sanyo Semiconductor Corporation, stk672-640b-e Datasheet - Page 22

• Manufacturer Part Number: stk672-640b-e
• Description: 2-phase Stepping Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

8. Other Notes on Use
In addition to the “Notes” indicated in the Sample Application Circuit, care should also be given to the following
contents during use.
(1) Allowable operating range
(2) Input pins
(3) Power connectors
(4) Input Signal Lines
Reg.
Operation of this product assumes use within the allowable operating range. If a supply voltage or an input
voltage outside the allowable operating range is applied, an overvoltage may damage the internal control IC or
the MOSFET.
If a voltage application mode that exceeds the allowable operating range is anticipated, connect a fuse or take
other measures to cut off power supply to the product.
If the input pins are connected directly to the PC board connectors, electrostatic discharge or other overvoltage
outside the specified range may be applied from the connectors and may damage the product. Current generated
by this overvoltage can be suppressed to effectively prevent damage by inserting 100Ω to 1kΩ resistors in lines
connected to the input pins.
Take measures such as inserting resistors in lines connected to the input pins.
If the motor power supply V CC is applied by mistake without connecting the GND part of the power connector
when the product is operated, such as for test purposes, an overcurrent flows through the V CC decoupling
capacitor, C1, to the parasitic diode between the V DD of the internal control IC and GND, and may damage the
power supply pin block of the internal control IC.
To prevent destruction in this case, connect a 10Ω resistor to the V DD pin, or insert a diode between the V CC
decoupling capacitor C1 GND and the V DD pin.
1) Do not use an IC socket to mount the driver, and instead solder the driver directly to the PC board to minimize
2) To reduce noise caused by electromagnetic induction to small signal lines, do not design small signal lines
5V
3) Pin 7 and Pin 11 of this product are N.C pins. Do not connect any wiring to these pins.
fluctuations in the GND potential due to the influence of the resistance component and inductance component
of the GND pattern wiring.
(sensor signal lines, and 5V or 3.3V power supply signal lines) that run parallel in close proximity to the motor
output line A (Pin 4), AB (Pin 5), B (Pin 3), or BB (Pin 1) phases.
Overcurrent protection measure: Insert a diode.
Overcurrent protection measure: Insert a resistor.
V DD =5V
18
9
MODE1
CLOCK
CWB
RESETB
ENABLE
MODE2
FAULT1
Vref
S.G
STK672-640B-E
V DD
V SS
FAO
FABO
FBO
FBBO
AI
BI
Vref
Over-current path
A
4
R1
AB
5
B
3
R2
GND
BB
1
2
6
C1
open
V CC
No. A1739-22/24
Reg.
24V