Diodes AH1891 User Manual

Description

AH1891

MINIATURE MICROPOWER OMNIPOLAR

HALL EFFECT SWITCH

Pin Assignments

The AH1891 is a miniature micropower Omnipolar Hall effect
switch IC with dual outputs specifically designed for portable
and battery powered equipment such as cellular phones and
portable PCs. To support battery powered equipment the
AH1891 has been optimized to operate over the suppl y range
of 1.8V to 3.3V and uses a sleep function to give an aver age
supply current of only 7uA. To minimize PCB space the
AH1891 is packaged in the small CSP package
(0.8mmx0.8mm) and the design integrates the external pull
up resistors to simplify the applications circuit.

The outputs of the AH1891 are switched with either a North or
South pole of sufficient strength. When the magnetic flux
density (B) is larger than operate point (Bop), Output 1 will
pull low and Output 2 will be inverted (high). The output states
are held until B is lower than release point (Brp).

NEW PRODUCT

The AH1891 is available in U-WLB0808-4 package.

Features

• Omnipolar (North or South) operation

• Low supply voltage of 1.8V to 3.3V

• Micropower operation

• Dual outputs for design flexibility

• Internal pull up and pull down capability

• Chopper stabilized design for:

o Superior temperature stability
o Superior temperature stability
o Superior temperature stability

• Good RF noise immunity

• -40°C to 85°C Operating Temperature

• ESD ＞ 4KV in Human Body Mode

• Miniature CSP package 0.8mm x 0.8mm

Typical Application Circuit

(Top View)

A1 A2

B1 B2

(Bottom View)

A2 A1

B2 B1

Applications

• Cellular phones

• Portable PCs and PDAs

• Digital cameras

• Portable and battery powered applications

AH1891

Document number: DS35207 Rev. 1 - 2

Vdd

GND

AH1891

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Output 1

Output 2

April 2011

© Diodes Incorporated

Pin Descriptions

Pin # Pin Name Description

A1 Out 1 Output Pin (active low)
A2 Out 2 Output Pin (active high)
B1 GND Ground
B2 Vdd Power Supply Voltage

Functional Block Diagram

NEW PRODUCT

Hall

Plate

AH1891

MINIATURE MICROPOWER OMNIPOLAR

HALL EFFECT SWITCH

Vdd

Power

Cancelling

Offset

Amp

switch

Latch

Out1

Hall

Plate

Cancelling

Output

Controller

Offset

Amp

Latch

GND

Vdd

Absolute Maximum Ratings (T

Symbol Parameter Values Unit

Vdd Supply voltage 5 V

B Magnetic flux density Unlimited
TA Operating Temperature Range -40 to +85 °C
Ts Storage Temperature Range -65 to +150 °C
PD Package Power Dissipation 166 mW
TJ Maximum Junction Temperature 150 °C

Recommended Operating Conditions (T

Symbol Parameter Conditions Rating Unit

Vdd Supply Voltage Operating 1.8 to 3.3 V

= 25°C)

A

= 25°C)

A

Out2

GND

AH1891

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AH1891

r

Electrical Characteristics (T

Symbol Parameter Conditions Min Typ. Max Unit

VOH Output On Voltage (High side) IO= -0.5mA Vdd-0.2 - - V

VOL Output On Voltage (Low side) IO= 0.5mA - - 0.2 V

Ioff Output Leakage Current Output off -

Idd(en)

Idd(dis) Chip disable - 5 8 uA
Idd(avg) Average supply current - 7 12 uA
Tawake Awake Time - 50 100 µs

Tperiod Period - 50 100 ms

D.C. Duty Cycle - 0.1 - %

Supply Current

Magnetic Characteristics (T

NEW PRODUCT

Symbol

Bops(south pole to brand side)
Bopn(north pole to brand side) -60 -40 -20
Brps(south pole to brand side)
Brpn(north pole to brand side) -50 -25 -12
Bhy(|Bopx|-|Brpx|) Hysteresis 15

Notes: 1. Typical data is at TA = 25°C, Vdd = 3V, and for design information only.

2. Operate point and release point will vary with supply voltage and operating temperature.

= 25°C, Vdd = 1.8V, unless otherwise specified)

A

Chip enable - 2 4 mA

= 25°C, Vdd = 1.8V~3.3V, Note 1)

A

Paramete

(Note 2)

Operate Point

Release Point

MINIATURE MICROPOWER OMNIPOLAR

HALL EFFECT SWITCH

<0.1

Min Typ. Max Unit

20 40 60

12 25 50

1 µA

(1mT=10 Gauss)

Gauss

AH1891

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Typical Operating Characteristics

Switchpointsvs.Temperature

Vdd=1.8V

Temperature (oC)

NEW PRODUCT

60

40

20

0

Gauss(G)

‐20

‐40

‐60

‐55 ‐40 ‐25 ‐105 203550658095

MINIATURE MICROPOWER OMNIPOLAR

Switch Points Bop and Brp vs. Temperature

Switchpointsvs.Temperature

Vdd=3.3V

60

T

=25oC

A

40

20

0

Gauss(G)

‐20

‐40

‐60

‐55 ‐40 ‐25 ‐10 5 203550658095

Tempe rature(oC)

Bops

Brps

Bopn

Brpn

Bhy_S

Bhy_N

Switch Points Bop and Brp vs. Supply Voltage

Switchpointsvs.Supplyvoltage

60

AH1891

HALL EFFECT SWITCH

Bops

Brps

Bopn

Brpn

Bhy_S

Bhy_N

40

20

0

Gauss(G)

‐20

‐40

‐60

1.5 1.8 2.1 2.4 2.7 3 3.3

SupplyvoltageVdd(V)

Bops

Brps

Bopn

Brpn

Bhys_S

Bhys_N

Average Supply Current vs. Temperature Average Supply Current vs. Supply Voltage

Averagesupplycurrentvs.Temperature

40

35

30

25

20

15

10

5

Avg.SupplyCu rrentIdd(uA)

0

‐55 ‐40 ‐25 ‐105 203550658095

Vdd=1.8Vand3.3V

Temperature(oC)

1.8V

3.3V

20

18

15

13

10

Avg.SupplyCurrent Idd(uA)

Averagesupplycurrentvs.Supplyvoltage

T

=25oC

A

8

5

3

0

1.51.82.12.42.7 3 3.3

SupplyvoltageVdd(V)

Idd(avg)

AH1891

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AH1891

Performance Characteristics

(1) U-WLB0808-4

TA (°C) 25 50 60 70 80 85 90 100 110 120 130 140 150

PD (mW) 166 132 120 105 93 86 79 66 53 39 26 13 0

D

(mW)

P

200

150

Power Di ssipation Cur ve (AH1891-C SP)

MINIATURE MICROPOWER OMNIPOLAR

HALL EFFECT SWITCH

NEW PRODUCT

100

50

0

0 25 50 75 100 125 150

TA (oC)

85-40

Ordering Information

AH1891 - CA4 - 7

Package

U-WLB0808-4

Packing

7 : Tape & Reel

Device

(Note 3)

AH1891-CA4-7 CA4 U-WLB0808-4 3000/Tape & Reel -7

Notes: 3. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.

4. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.

Package

Code

Packaging

(Note 4)

Quantity Part Number Suffix

7” Tape and Reel

AH1891

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Marking Information

(1) U-WLB0808-4

(Top View)

A1 A2

XX

Y W X

B1 B2

Part Number Package Identification Code

AH1891-CA4-7 U-WLB0808-4 A2

Package Outline Dimensions (All Dimensions in mm)

NEW PRODUCT

(1) Package type: U-WLB0808-4

XX

Y : Year : 0~9

W

X

MINIATURE MICROPOWER OMNIPOLAR

: Identification Code

: Week : A~Z : 1~26 week;

a~z : 27~52 week; z represents

52 and 53 week

: A~Z : Internal Code

AH1891

HALL EFFECT SWITCH

4x-

4

0

0.15 A

4x

Pin ID

0.05 C

0.08 C

-

?

0

.0

5

M

C

L

.2

1

5

±

0

.

0

1

C

A

B

0.80±0.040

C

L

0.40Ref.

Top Mark

0.40±0.020

C

L

A

0.40Ref.

C

L

Hall sensor location

0.351±0.01

0.155±0.01

0.40±0.020

B

0.40±0.020

C

L

0.80±0.040

C

L

Land Pattern Recommendation

(unit:mm)

0.506Ref.

C

1

0

.

0

±

2

7

1

.

0

?

-

x

4

0.40±0.020

AH1891

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AH1891

MINIATURE MICROPOWER OMNIPOLAR

HALL EFFECT SWITCH

NEW PRODUCT

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DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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IMPORTANT NOTICE

LIFE SUPPORT

AH1891

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