Diodes AH211 User Manual

Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

General Description

The AH211 is an integrated Hall sensor with output
driver and frequency generator designed for electronic
commutation of brush-less DC motor applications. The
device includes an on-chip Hall sensor for magnetic
sensing, an amplifier that amplifies the Hall voltage, a
Schmitt trigger to provide switching hysteresis for
noise rejection, a temperature compensation circuit to
compensate the temperature drift of Hall sensitivity,
two complementary open-collector drivers for sinking
large load current. It also includes an internal band-gap
regulator which is used to provide bias voltage for
internal circuits.

Place the device in a variable magnetic field, while the
magnetic flux density is larger than threshold BOP, DO
will be turned on (low) and DOB (and FG) will be
turned off (high). This output state is held till the mag­netic flux density reversal falls below BRP causing DO
to be turned off (high) and DOB (and FG) turned on
(low).

AH211 is available in TO-94 (SIP-4L) package.

Features

· On-Chip Hall Sensor

· 3.5V to 16V Supply Voltage

· 400mA (avg) Output Sink Current

o

· -20

· Built-in FG Output

· Low Profile TO-94 (SIP-4L) Package

· ESD Rating: 600V (Machine Model)

C to 85oC Operating Temperature

Applications

· Dual-Coil Brushless DC Motor

· Dual-Coil Brushless DC Fan

· Revolution Counting

· Speed Measurement

TO-94

Figure 1. Package Type of AH211

Feb. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited

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Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Pin Configuration

Z4 Package

(TO-94)

Pin Description

Pin Number Pin Name Function

1 FG Frequency Generation

2 DO Output 1

3 DOB Output 2

4 GND Ground

4

3

2

1

Figure 2. Pin Configuration of AH211 (Front View)

GND

DOB
DO

FG

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Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Functional Block Diagram

Regulator

Hall

Sensor

Amplifier

Ordering Information

Temperature

Compensation

Schmitt

Trigger

1

FG

Figure 3. Functional Block Diagram of AH211

Output

Driver

2

DO

3

DOB

4

GND

AH211 -

Circuit Type

Package

Z4: TO-94 (SIP-4L)

E1: Lead Free
G1: Green

Magnetic Characteristics
A: 5 to 60 Gauss
B: 90 Gauss

Package

TO-94

BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green package.

Temperature

Range

o

-20 to 85

C

Lead Free Green Lead Free Green

AH211Z4-AE1 AH211Z4-AG1 AH211 AH211Z4-G1 Bulk

AH211Z4-BE1 AH211Z4-BG1 AH211 AH211Z4-G1 Bulk

Part Number Marking ID

Packing

Typ e

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Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Absolute Maximum Ratings (Note 1)

(T

=25oC)

A

Parameter Symbol Value Unit

Supply Voltage V

CC

20 V

Magnetic Flux Density B Unlimited Gauss

400 mA

Output Current

Continuous

Hold 600 mA

I

O

Peak (Start up) 800 mA

FG Voltage V

FG Current I

Power Dissipation P

Die to Atmosphere θ

FG

FG

D

JA

30 V

20 mA

550 mW

227

o

C/W

Thermal Resistance

Die to Package Case θ

Storage Temperature T

JC

STG

49

-50 to 150

o

C/W

o

C

ESD (Machine Model) 600 V

ESD (Human Body Model) 6000 V

Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under "Recommended Operating Conditions" is not implied. "Absolute Maximum Ratings" for extended period may affect
device reliability.

Recommended Operating Conditions

(TA=25oC)

Parameter Symbol Min Max Unit

Supply Voltage

Ambient Temperature

V

CC

T

A

Feb. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited

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3.5 16 V

-20 85

o

C

Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Electrical Characteristics

(TA=25oC, VCC=14V, unless otherwise specified)

Parameter Symbol Test Condition Min Typ Max Unit

B>150Gauss, VCC=3.5V,

, IDO=100mA

, I

, IDO=400mA

=400mA)

DOB

=3.5V,

CC

=100mA)

DO=VCC

1.1 V

,

1.05 1.3 V

Output Saturation Voltage

V

DOB=VCC

(or B<-150Gauss, V

V

DO=VCC

V

SAT

B>150Gauss,
V

DOB=VCC

(or B<-150Gauss, V

I

DOB

FG Saturation Voltage

FG Leakage Current

Supply Current

V

SATF

I

OLF

I

Output Rise Time tr R

Output Fall Time tf R

Switch Time Differential ∆tR

Output Zener Breakdown Voltage V

B<-150Gauss, VDO=VCC,

I

=20mA

FG

B>150Gauss, V

=16V

V

FG

B>150Gauss, V

CC

(or B<-150Gauss, V

=1kΩ, CL=10pF 3.0 10 µs

L

=1kΩ, CL=10pF 0.3 1.0 µs

L

=1kΩ, CL=10pF 3.0 10 µs

L

Z

DOB=VCC

DOB=VCC

DO=VCC

0.35 0.6 V

,

,

)

0.1 10 µA

48mA

31 V

Magnetic Characteristics

(TA=25oC)

Parameter Symbol Grade Min Typ Max Unit

Operating Point

Releasing Point

Hysteresis B

B

B

OP

RP

HYS

A 5 30 60 Gauss

B90Gauss

A-60-30-5Gauss

B -90 Gauss

60 Gauss

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Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Magnetic Characteristics (Continued)

+14V

S

Marking Side

N

DO (V)

V

CC

-40 -20 0 20 40

Magnetic Flux Density B (Gauss)

16

14

12

10

8

6

4

2

FG

12

R1

1kΩ

R2

1kΩ

R3

1kΩ

Figure 4. Basic Test Circuit

V

SAT

C1

10pF

V

SAT

-40 -20 0 20 40

AH211

DO DOB GND

4

3

C2 C3

10pF 10pF

DOB (V)

16

14

12

10

8

6

4

2

Magnetic Flux Density B (Gauss)

FG (VFG)

DO (V

DOB (V

OUT1

OUT2

)

)

V

CC

Figure 5. V

vs. Magnetic Flux Density

DO

Figure 6. V

vs. Magnetic Flux Density

DOB

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Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Typical Performance Characteristics

4.4

4.2

4.0

3.8

3.6

(mA)

3.4

CC

I

3.2

3.0

2.8

2.6

2.4
4 6 8 1012141618

I

PIN2

I

PIN3

VCC (V)

Figure 7. I

80

60

40

CC

vs. V

CC

TA=25oC

80

60

40

(GS)

20

HYS

/B

RP

0

/B

OP

B

-20

-40

-60

4.0 6.0 8.0 10.0 12.0 14.0 16.0

B

OP

B

RP

B

HYS

VCC (V)

800

600

Figure 8. B

OP/BRP/BHYS

vs. V

CC

20

(Gauss)

HYS

/B

0

RP

/B

OP

B

-20

-40

-60

B

OP

B

RP

B

HYS

-20-100 1020304050607080

TA (oC)

Figure 9. BOP/BRP/B

vs. Ambient Temperature

HYS

400

(mW)

D

P

200

0

-25 0 25 50 75 100 125 150

TA (oC)

Figure 10. PD vs. Ambient Temperature

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Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Typical Performance Characteristics (Continued)

5.5

5.0

4.5

4.0

(mA)

3.5

CC

I

3.0

2.5

2.0

-40-200 20406080

I

PIN2

I

PIN3

VCC=14V

TA (oC)

Figure 11. Supply Current vs. Ambient Temperature

250

200

150

(mV)

SATF

V

100

1100

VCC=14V

I

=400mA

1050

V

1000

(mV)

SAT

V

950

900

-40-20 0 20406080

V

OUT

PIN2

PIN3

TA (oC)

Figure 12. V

320

300

280

V

I

OUT

PIN2

=20mA

vs. Ambient Temperature

SAT

=14V

(mV)

SATF

V

260

50

0

0 5 10 15 20

I

(mA)

OUT

Figure 13. FG Saturation Voltage vs.

Output Current

240

220

-40 -20 0 20 40 60 80

TA (oC)

Figure 14. FG Saturation Voltage vs.

Ambient Temperature

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Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Application Information

Figure 15 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 (V

up voltage (V

R1=(V

DD-VON

). The calculation formula is:

DD

) / IFG

), sink current (IFG), and pull-

ON

According AH211's specification, if V

=5V, R1 must

DD

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:

=5V for TTL level.

V

DD

If saturation voltage is 0.6V (IC specification)

=20mA ( ≤20mA) , then R1=220Ω ;

I

FG

If saturation voltage is 0.1V, I

=1mA (=<20mA) , the

FG

value of R1=4.9kΩ

VCC (Red Wire)

C1

FG

12

V

DD

R1 1kΩ

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.

D1

AH211

COIL1 COIL2

DO DOB GND

4

3

FG (Yellow Wire)

GND (Black Wire)

Figure 15. AH211 Typical Application Circuit

Feb. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited

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Data Sheet

TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT AH211

Mechanical Dimensions

Unit: mm(inch)TO-94

0.500(0.020)

0.700(0.028)

1.520(0.059)

1.720(0.067)

0.700(0.028)

0.900(0.035)

1.250(0.050)

Package Sensor Location

14.000(0.550)

15.300(0.602)

3.780(0.149)

4.080(0.161)

4.980(0.196)

5.280(0.208)

1.850(0.073)

0.380(0.015)

0.550(0.022)

45°TYP

0.360(0.014)

0.510(0.020)

3.450(0.136)

3.750(0.148)

0.360(0.014)

0.500(0.020)

1.270(0.050) TYP

3.710(0.146)

3.910(0.154)

Feb. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited

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BCD Semiconductor Manufacturing Limited

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