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ST1111N Fiches technique(PDF) 2 Page - Silicon Touch Technology Inc. |
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ST1111N Fiches technique(HTML) 2 Page - Silicon Touch Technology Inc. |
2 / 7 page 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ST1111N SP-ST1111N-A.004(2007-07-12) Version : A.004 Page :1 ST1111N Single Coil Brushless DC Motor Drivers ( 1.5 to 7.5 Volts ) General Specifications The device is designed specifically for electronic commutation of single coil DC motor applications. They are intended to be used as an interface between HALL effect latch and a single coil load. Each device includes a power reverse protected diode, a fan tachometer for dividing the frequency of tachometer pulses from the driver with 2, a lock detection circuit to shut down the drivers for overheat prevention, and complementary bi-directional drivers for driving and sinking large load on a single silicon chip. Though the DC brushless motor driver can be started as low voltage as 1.5 Volt to 2 Volt and the device permits operation with supply voltage of 1.5 to 7.5 Volts, the design, specifications and performance have been optimized for 3V and 5V brushless DC motor applications. The output driver node O1/O2 will be “turned to sink/drive” for V(HIN) = logic low. Similarly, the output O1/O2 will be “turned to drive/sink” for V(HIN) = logic high . 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. 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 |
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