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AH1804 Dataheets PDF



Part Number AH1804
Manufacturers Diodes
Logo Diodes
Description MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Datasheet AH1804 DatasheetAH1804 Datasheet (PDF)

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 mini.

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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 .


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