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

：5

Application Notes

The FGR pin is an open-drained output with built-in pull-up resistor about 100K

Ω and outputs the same frequency with HIN pin for ST1114E, the half

frequency of HIN pin for ST1114K, and rotation detection result for ST1114P. An

additional resistor can be used to pull up the FGR voltage to the appropriate level

which depends on the voltage level of the monitoring/control system. For the

ST1114P, the output of RD is at logical low state when fan is operating and

logical high state when fan is lock.

The resistor R1 connected between system power and VDD of HALL IC and

driver increase system stability. The suggestion value of R1 is about 75Ω for

12V application.

There is no requirement of the capacitor between VDD and GND in normal

applications. The connection of this capacitance will increase stability of

operation, special when the motor is operating at large current or low voltage.

The power dissipated by the IC varies widely with the supply voltage, the output

current, and loading.

It is important to ensure the application does not exceed

the allowable power dissipation of the IC package.

The recommended motor

driver power dissipation versus temperature is depicted as follows:

Power Dissipation-Temperature

0

50

100

150

200

250

300

350

400

0

25

50

75

100

125

150

Ambient Temperature ( ℃ )