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AH211Z4-BE1

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT

BCD Semiconductor 

Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT

AH211

Application Information

Figure 13 is the typical application circuit for AH211.

Usually, there are three wires for fan connection: the

red is input of power supply; the yellow is the output of

FG; the black is the ground. R1 is an external pull-up

resister for the use of measuring FG signal from fan.

The value of R1 could be decided by the transistor

saturation voltage (VON), sink current (IFG), and pull-

up voltage (VDD). The calculation formula is:

R1=(VDD-VON) / IFG

According AH211's specification, if VDD=5V, R1 must

be larger than 220Ω.

D1 is the reverse protection diode. If the red and black

wires reversely connected, the current will flow from

the ground via IC and coils L1 and L2 to power supply.

Under such circumstances, the IC and coils are easy to

be burned out. Therefore, the reverse protection diode

D1is necessary. However, D1 will also cause an extra

voltage drop on the supply voltage.

For example:

VDD=5V for TTL level.

If saturation voltage is 0.6V (IC specification)

IFG=20mA ( ≤20mA) , then R1=220Ω ;

C1 is a capacitor to reduce the ripple noise caused by

the transient of the output stages. The amplitude of the

ripple noise depends on the coil impedance and its

characteristics.

If saturation voltage is 0.1V, IFG=1mA (=<20mA) , the

value of R1=4.9kΩ

VCC (Red Wire)

D1

VDD

FG (Yellow Wire)

GND (Black Wire)

AH211

C1

FG DO DOB GND

1234

R1 1kΩ

COIL1 COIL2

Mar. 2007 Rev. 1.3

Figure 13. AH211 Typical Application Circuit

BCD Semiconductor Manufacturing Limited

9

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