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Diodes Semiconductor Electronic Components Datasheet

AH1898 Datasheet

PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH

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AH1898 pdf
AH1898
PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH
Description
The AH1898 is a micropower magnetic range selectable (Bop/Brp)
Omnipolar Hall effect switch IC with internal pull up and pull down
capability, designed for portable and battery powered consumer
equipment such as cellular phones and portable PCs. To support
battery powered equipment and low voltage microcontrollers, the
AH1898 can operate over the supply range of 1.6V to 3.6V and uses
a hibernating clocking system to minimize the power consumption.
The average supply current is only 4.3µA typical at 1.80V. The
AH1898 has an 8kV ESD rating on the supply and output pins. To
minimize PCB space the AH1898 is packaged in the small
CSP package (0.81mm x 0.81mm typical).
The output is activated with either a north or south pole of sufficient
magnetic field strength. The user can select one of two magnetic
sensitivity bands via the BSEL pin without the addition of any external
components allowing a flexible but small solution. The band select
can be hardwired or be changed on the fly via a logic source such as
a micro-controller. When the magnetic flux density (B) perpendicular
to the package is larger than operate point (Bop), the output will be
turned on (pulled low) and held until B is lower than release point
(Brp). The output will remain off when there is no magnetic field.
Pin Assignments
(Top View)
(Bottom View)
U-WLB0808-4
Features
Omnipolar Operation (North or South pole)
Programmable Operate and Release Points
Supply Voltage of 1.6V to 3.6V
Micropower Operation
Chopper Stabilized Design Provides
Superior Temperature Stability
Minimal Switch Point Drift
Enhanced Immunity to Physical Stress
No External Pull-up Resistors Required
Good RF Noise Immunity
-40°C to +85°C Operating Temperature
8kV Human Body Model ESD Capability
Miniature U-WLB0808-4 (CSP 0.81mm x 0.81mm typical)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
http://www.D
Open and Close Detect for Cellular Phones
Holster or Cover Detect for Cellular Phones and Tablet PCs
Cover or Display Switch in Portable PCs
Digital Still, Video Cameras and Handheld Gaming Consoles
Proximity and Position Switches
a
t
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
AH1898
Document number: DS36028 Rev. 1 - 2
1 of 11
www.diodes.com
February 2013
© Diodes Incorporated
d
a



Diodes Semiconductor Electronic Components Datasheet

AH1898 Datasheet

PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH

No Preview Available !

AH1898 pdf
Typical Applications Circuit
AH1898
Note:
4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical.
Pin Descriptions
Package: U-WLB0808-4
Pin Number
A1
Pin Name
BSEL
A2 GND
B1 VDD
B2 OUTPUT
Function
Band Select Pin to select operating and release gauss points
Ground Pin
Power Supply Input
Output Pin
Functional Block Diagram
http://www.DataSheet4U.net/
AH1898
Document number: DS36028 Rev. 1 - 2
2 of 11
www.diodes.com
February 2013
© Diodes Incorporated
datasheet pdf - http://www.DataSheet4U.net/



Diodes Semiconductor Electronic Components Datasheet

AH1898 Datasheet

PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH

No Preview Available !

AH1898 pdf
AH1898
Absolute Maximum Ratings (Note 5) (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
VDD_REV
IOUTPUT
B
PD
Ts
TJ
ESD HBM
Supply Voltage (Note 6)
Reverse Supply Voltage
Output Current (source and sink)
Magnetic Flux Density
Package Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
Parameter
Human Body Model (HMB) ESD capability
U-WLB0808-4
VDD, GND and OUT pins
BSEL pin
Rating
6
-0.3
2.5
Unlimited
160
-65 to +150
150
8
6
Unit
V
V
mA
mW
°C
°C
kV
kV
Notes:
5. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
6. The absolute maximum VDD of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to
operate the device at the absolute maximum rated conditions for any period of time.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
TA
Parameter
Supply Voltage
Operating Temperature Range
Conditions
Operating
Operating
Rating
1.6V to 3.6V
-40 to +85
Unit
V
C
Electrical Characteristics (@TA = +25°C, VDD = 1.8V, unless otherwise specified.)
Symbol
Parameter
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Conditions
Min Typ
VOL
VOH
VSEL_LB
VSEL_HB
RPU_BSEL
IDD(awake)
IDD(sleep)
IDD(avg)
Tawake
Tperiod
D.C.
Output Low Voltage (on)
Output High Voltage (off)
Bans select voltage for low band
Bans select voltage for high band
BSEL pin internal pull-up resistor
Supply Current
Average Supply Current
Awake Time
Period
Duty Cycle
IOUT = 1mA
IOUT = -1mA
(Note 7)
During ‘awake’ period
During ‘sleep’ period
VDD = 1.8V
VDD = 3.6V
(Note 8)
(Note 8)
VDD -0.2
0
1.4
0.1
VDD -0.1
50
2.1
2.5
4.3
7.2
50
50
0.1
tBAND
Band transition time
(Note 9)
— 100.0
Notes:
7. BSEL pin internal pull-up resistor is only active during AWAKE time.
8. When power is initially turned on, the operating VDD (1.6V to 3.6V) must be applied to guarantee the output sampling.
The output state is valid after the second operating phase (typical 100ms).
9. Transition time varies dependant on the timing of BSEL activation during the sleep and awake phases.
Max
0.2
0.5
3.6
8
13
100
100
200.1
Unit
V
V
V
V
k
mA
mA
µA
µA
µs
ms
%
ms
AH1898
Document number: DS36028 Rev. 1 - 2
3 of 11
www.diodes.com
February 2013
© Diodes Incorporated
datasheet pdf - http://www.DataSheet4U.net/




Part Number AH1898
Description PROGRAMMABLE MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH
Maker Diodes
Total Page 11 Pages
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