Document
NEW PRODUCT
AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Description
The AH1804 is a micropower Omnipolar Hall effect switch IC with a single output driver with internal pull up and pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs the average supply current is only 12µA at 3.3V. To support battery powered equipment the AH1804 can operate over the supply range of 2.5V to 3.6V and uses a hibernating clocking system to minimize the power consumption.
Pin Assignments
( Top View )
GND NC
4
3
1
2
VDD Output
DFN1216-4
The output is activated with either a north or south pole of sufficient strength. When the magnetic flux density (B) 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 AH1804 is available in SC59 and small low profile DFN1216-4 packages.
(Top View)
GND 2. SC59
3. Output 1 . VDD
Features
• Omnipolar operation (North or South pole) • Low supply voltage 2.5V to 3.6V • Micropower operation • No external pull up resistors required • Chopper stabilized design
o Superior temperature stability o Extremely Low Switch-Point Drift o Insensitive to Physical Stress • Good RF noise immunity • -40°C to 85°C operating temperature • Small low profile DFN1216-4 and SC59 packages • ESD (HBM) > 5KV • “Green” Molding Compound
Applications
• Cover switch in clam-shell and slide cellular phones • Cover switch in portable PC’s, Tablets and PDA • Display screen open/close detect in Digital
camcorders • Contact-less switch in portable battery powered
consumer and industrial products
Typical Application Circuit
VDD 2.5V to 3.6V
Cin
AH1804
Output
GND
Note: Cin is for power stabilization and to strengthen the noise immunity, C = 100nF or higher must be used.
AH1804
Document number: DS35314 Rev. 2 - 2
1 of 9 www.diodes.com
September 2011
© Diodes Incorporated
NEW PRODUCT
AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Pin Descriptions
Pin Name
P/I/O
Description
VDD GND
P/I Power Supply Input P/I Ground
Output
O
Output Pin
NC
NC No Connection (Note 1)
Notes: 1. NC is “No Connection” which is not connected internally. This pin can be left open or tied to ground.
Functional Block Diagram
VDD
Hall Plate
Hall Plate
Offset Cancellation
Amp Amp
Sleep/Awake Logic and Power Switch
Latch Latch
Output Driver Controller
Output GND
Offset Cancellation
AH1804
Document number: DS35314 Rev. 2 - 2
2 of 9 www.diodes.com
September 2011
© Diodes Incorporated
NEW PRODUCT
AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Absolute Maximum Ratings (TA = 25°C, Note 2)
Symbol
Characteristics
Values
Unit
VDD
Supply voltage (Note 3)
5.0
V
VDD rev B
Reverse supply voltage Magnetic flux density
-0.3
V
Unlimited
Ts
Storage Temperature Range
-65 to +150
°C
PD
Package Power Dissipation
DFN1216-4 SC59
230 mW
270
TJ
Maximum Junction Temperature
150
°C
Notes:
2. 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
3. The absolute maximum of 5V is a transient stress rating and is not meant as functional operating conditions. 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)
Symbol
Characteristics
Conditions
VDD Supply Voltage TA Operating Temperature Range
CIN =0.1µF (Note 4) Operating
Notes: 4. Decoupling capacitor CIN = 100nF or higher must be used for full 2.5V to 3.6V supply range.
Rating 2.5 to 3.6 -40 to +85
Unit V °C
Electrical Characteristics (TA = 25°C, VDD = 3.3V, unless otherwise specified)
Symbol VOL VOH
Idd(en) Idd(dis) Idd(avg) Tawake Tperiod
D.C.
Characteristics Output Low Voltage (on) Output High Voltage (off)
Supply current
Awake Time Period Duty Cycle
Conditions IOUT = 1mA IOUT = -1mA Chip enable Chip disable Average supply current, (Note 5) (Note 5)
Min ⎯ VDD-0.2 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯
Typ. 0.1 VDD-0.1 4 8 12 50 50 0.1
Notes: 5. When power is initially on, the operating VDD (2.5V to 3.6V) must be applied to be guaranteed for the output sampling. The output state is valid after the second operating phase (typical 100ms).
Max 0.2 ⎯⎯ ⎯ ⎯ ⎯ 100 100 ⎯
Unit V V mA µA µA µs ms %
AH1804
Document number: DS35314 Rev. 2 - 2
3 of 9 www.diodes.com
September 2011
© Diodes Incorporated
NEW PRODUCT ( Output Voltage ) ( Output Voltage )
AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Magnetic Characteristics (TA = 25°C, VDD = 3.3V, Note 6)
Symbol Bops(south pole to brand side) Bopn(north .