STK681-300

No. A0760-6/10

(6) Sample Timing Diagram

(7) Smoke Emission Precautions: There is a possibility of smoke emission if the hybrid IC is subjected to physical or

electrical damage as the result of being used without compliance with the specifications.

I/O Functions of Each Pin

Pin Name

Pin No.

Function

IN1

12

Input pin for turning TR1 and F1 ON and OFF

At high level, TR1: ON and F1: OFF; at low level TR1: OFF and F1: ON

IN2

13

Input pin for turning TR2 and F2 ON and OFF

At high level, TR2: ON and F2: OFF; at low level, TR2: OFF and F2: ON

INH

14

Pin for turning TR1 and TR2 OFF; At high level TR1 and TR2: OFF

This pin is usually low or open.

OUT1

8

This pin connects to the motor and outputs source/sync current depending on conditions at IN1 and IN2.

OUT2

6

This pin connects to the motor and outputs source/sync current depending on conditions at IN1 and IN2.

Vref1a

Vref1b

16

18

This pin is used for current setting for constant-current operation performed with the Vrefa and Vrefb pins

connected

A voltage of 0.29V at Tc=25

°C results for Vref1.

0.29V is set by connecting 82k

Ω and 5.1kΩ in series.

Current detection resistance is Rs=0.10

Ω. Set using IO peak=Vref1÷Rs.

Vref2

17

Be sure to usually leave this pin open.

The overheating control circuit can be made to stop operating by connecting this pin to the GND or S.P pin.

S.P

2

Vref1 voltage can be lowered by connecting a resistor between the Vref1 and S.P pins.

RSO

3

This pin is used to monitor the voltage across the current sensing resistor, Rs. Must be connected to the RSI

pin.

RSI

19

This pin is connected to the RSO pin and serves as an input to the circuit that compares the input with Vref1.

Forward

rotation

Brake

Reverse

rotation

IN1

IN2

INH

Stop 1

Stop 2

Stop 1

IN1

IN2

INH

Stop 1

Stop 1

Stop 2

Forward

rotation

Forward

rotation

Forward

rotation

Brake

Brake

Brake

Reverse

rotation

Reverse

rotation

Reverse

rotation