點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

FD212

SP-FD212-A.003

Version

：A.003

Page

：4

Power Dissipation-Temperature (SOT25)

0

50

100

150

200

250

300

350

400

450

500

0

25

50

75

100

125

150

Ambient Temperature ( ℃ )

Power Dissipation-Temperature (LFCSP8)

0

100

200

300

400

500

600

700

800

0

25

50

75

100

125

150

Ambient Temperature ( ℃ )

Block Diagram & Application Circuit

Application Notes

There is no requirement of the bypass capacitor or Zener Diode between VDD

and GND in normal applications. The connection of this capacitor or Zener Diode

will increase stability of operation, if required.

The FG pin is an open-drained output. The output frequency is corresponding to

the rotation speed sensed by the built-in Hall effect position sensor. With suitable

output pull-up, the fan tachometer output can be used directly with bipolar or

MOS logic for motor speed monitoring/control.

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 of SOT25 and LFCSP8 are depicted

as follows:

HALL

IC

LOGIC

BLOCK

+

-

POWER

FG

LOCK DETECTION

TACHO

GENERATOR

DRIVERS

VDD

GND

FG

O1

O2

Power