點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
ST1114E/ST1114K/ST1114P
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.
SP-ST1114EKP-A.011
Version：A.011
Page：1
SITI [ SILICON TOUCH TECHNOLOGY INC. ]
