點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

ST1114E/ST1114K/ST1114P

SP-ST1114EKP-A.011

Version

：A.011

Page

：1

ST1114E / ST1114K / ST1114P

Double Coil Brushless

DC Motor Driver ( 1.8 to 16 Volts )

General Specifications

The devices are designed specifically for electronic commutation of double

coil DC motor applications.

There are intended to be used as an interface

between a HALL effect latch and a double coil load.

Each device includes a fan

tachometer, a lock detection circuit to shut down the drivers for overheat

prevention, and two drivers for sinking large load on a single silicon chip.

The fan tachometer is designed for fan speed output as open-drain output

with a built-in pull-up resistor about 100KΩ and these devices are designed for

different applications, ST1114E is for 4 poles fan application, ST1114K is for 8

poles fan application and ST1114P is for rotation detection output. With suitable

output pull up resistance, this fan tachometer output can be used directly with

bipolar or MOS logic for motor speed monitoring/control.

The output driver node “O1” will be “turned to sink” for V(HIN) = logic low.

Similarly, the output node “O2” will be “turned to sink” for V(HIN) = logic high.

The devices also provide lock and auto-restart function without any timing

capacitor. If the motor rotation is stalled by external force or obstacles, overdrive

current ( or lock current ) may incur coil overheat/burning.

To prevent coil

overheat/burning, these devices incorporate lock detection circuit to shut down

the drivers.

After the motor locking is released, the drivers can be powered up

using an automatic self-restart circuit. For 12V application, the drivers are shut

down roughly 1 to 3 seconds after the motor is locked. After the drivers are shut

down, the automatic self-restart circuit will try to power up the drivers every 1 to

3 seconds.