STK672-600 查看數據表（PDF） - SANYO -> Panasonic

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STK672-600

2-phase Stepping Motor Driver

SANYO -> Panasonic 

Precautions

STK672-600

[Damage to the internal MOSFET]

• The RESETB pin must be fixed low when applying 5V power. If the RESETB pin is allowed to go high at the same

time as the 5V power, simultaneous ON of the output phase will result, causing damage to the internal MOSFET.

[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

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.

• If the driver region VSS pin (Pin 16), S.G pin (Pin 18), P.G1 pin (Pin 2), and P.G2 pin (Pin 6) cannot be connected

to a single ground, make sure to connect the VSS pin to the control system S.GND, and the S.G pin to the P.G1 pin

and P.G2 pin.

[Input pins]

• If VDD is not being applied to the hybrid IC, do not apply voltage to input Pins 10, 12, 13, 14, 15, or 17. In addition,

if VDD is being applied, use care that each input pin does not apply a negative voltage less than -0.3V to VSS, Pin 16,

and do not apply a voltage greater than or equal to VDD voltage.

• Do not wire by connecting the circuit pattern on the P.C.B side to Pins 7, 8, or 11 on the N.C. shown in the internal

block diagram.

• Insert resistor RO3 (47 to 100Ω) so that the discharge energy from capacitor CO4 is not directly applied to the CMOS

IC in this hybrid device. If the diode D1 has Vf characteristics with Vf less than or equal to 0.6V (when If = 0.1A),

this will be smaller than the CMOS IC input pin diode Vf. If this is the case RO3 may be replaced with a short without

problem.

• Both TTL and CMOS levels are used for the pin 10, 12, 13, 15 and 17 inputs.

• Since the input pins do not have built-in pull-up resistors, when the open-collector type pins 10, 12, 13, 15, and 17 are

used as inputs, a 1 to 15kΩ pull-up resistor (to VDD) 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 0.6V at Low level (less than 0.6V at Low level when IOL=5mA).

• If input pins are connected to GND (VSS) using a pull-down resistor, be sure to mount a resistor having a resistance

of 120Ω or less. If designs call for a pull-down resistor having a resistance in the range 120Ω to 30kΩ, be absolutely

sure to mount a 1,000pF capacitor between the input pins and the VSS Pin. Because sufficient VIL cannot be

maintained due to the effect of input leak current, IIL=±10μA max, do not connect a pull-down resistor having a

resistance of 30kΩ or higher.

• The sample application circuit includes a simple reset circuit using D1, R03, C02, and R04. If 5V power rises while

voltage still remains in C02, the reset signal cannot be detected as LOW and the driver may be damaged because ON

operations result at the same time that driver output is in A or AB phase or B or BB phase. The voltage of C02 must

therefore be less than 0.6V when the 5V power rises.

In addition, if a RESETB signal is to be input based on an external signal such as the CLOCK signal, RESETB must

always be fixed to a Low level when the 5V power signal rises.

• To prevent malfunction due to chopping noise, we recommend that you mount a 1000pF capacitor between Pin 16 and

each of the input Pins 10, 12, 13, 14, 15, and 17. Be sure to mount the capacitor as close as possible to the pins of

hybrid IC.

If input is fixed Low, directly connect to Pin 16.

If input is fixed High, directly connect to the 5V power line.

[Current setting Vref]

• Considering the specifications of the Vref input bias current, IIB, a value of 1kΩ or less is recommended for R02.

• If the motor current is temporarily reduced, the circuit given below (STK672-600: IOH>0.2A, STK672-610:

IOH>0.3A) is recommended.

• Although the driver is equipped with a fixed current control function, it is not equipped with an overcurrent protection

function to ensure that the current does not exceed the maximum output current, IOH max. If Vref is mistakenly set to

a voltage that exceeds IOH max, the driver will be damaged by overcurrent.

No. A0755-5/19

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