ST1114C SITI [Silicon Touch Technology Inc.], ST1114C Datasheet - Page 6

• Manufacturer Part Number: ST1114C
• Description: Double Coil Brushless DC Motor Predriver
• Manufacturer: SITI [Silicon Touch Technology Inc.]

Application Notes
The FGR pin is an open-drained output and outputs the same frequency with HIN pin for
ST1114C, the half frequency of HIN pin for ST1114L, and rotation detection result for
ST1114M. For the rotation detecting output application by ST1114M, the FGR pin, with a
suitable external pull-up resistor, is at logical low state when fan is operating and logical high
state when fan is stopped.
The connection of the capacitance between VDD and GND will increase stability of operation.
The connection of the resistor R1 between VDD and pre-driver will protect device under 12V
operating. For 12V application, the recommended value of this resistor R1 is about 100Ω. For
24V or higher than 12V application, it is recommended that the operating voltage on IC must
be under 12V. As shown on application circuit, it is recommended to connect about 0.5KΩ~1K
Ω resistor R1 and 12Volts Zener Diode DZ between VDD and pre-driver and their values are
dependent on fan applications.
The period of locking detection and automatic-restart are a little different at different operating
voltage. In normal 12V applications, the lock detection time is about 250ms and auto-restart
time is about 250ms per 2 seconds..
The power dissipated by the IC varies widely with the supply voltage, the output current, and
loading.
dissipation of the IC package. The recommended motor driver power dissipation versus
temperature is depicted as follows:
SP-ST1114CLM-A.008
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
It is important to ensure the application does not exceed the allowable power
Above 12V(24V,48V)
Fan Application
12V
5V
400
350
300
250
200
150
100
50
0
0
25
Power Dissipation-Temperature
Ambient Temperature ( ℃ )
Suggestion for R1
50
Version
0.5KΩ~1KΩ
100Ω
75Ω
75
：
A.008
100
ST1114C / ST1114L / ST1114M
125
Zener Diode at IC VDD
150
<12V
-
-
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