AH1887 MICROPOWER, ULTRA-SENSITIVE HALL EFFECT SWITCH Description Pin Assignments AH1887 is with two Hall effect plates and dual CMOS output ( Top View ) driver, mainly designed for batterypowered, hand-held equipment (such as Cellular and Cordless Phone, PDA). The Out 2 1 5 Out 1 total operation power is down to 15uW in the 1.8V supply. Either north or south pole of sufficient strength will turn the GND 2 output on. The output will be turned off under no magnetic field. NC 3 4 Vdd While the magnetic flux density (B) is larger than operate SOT553 point Bop(s), the output1 will be turned on (low), the output is held until B is lower than release point Brp(s), then turned off (high). While the magnetic flux density (B) is larger than operate point Bop(n), the output2 will be turned on (low), the output is held until B is lower than release point Brp(n), then turned off (high). Features Applications Cellular phone Micropower operation PDA Operation with North or South Pole Cordless phone 1.65V to 3.3V battery operation Chopper stabilized Superior temperature stability Extremely Low Switch-Point Drift Insensitive to Physical Stress Good RF noise immunity -40C to 85C operating temperature ESD 4KV in human body mode Package: SOT553 Green Molding Compound Typical Application Circuit Vdd Output 1 AH1887 Output 2 GND 1 of 7 August 2010 AH1887 Diodes Incorporated www.diodes.com Document number: DS31313 Rev. 4 - 2 Offset Offset Cancelling Cancelling AH1887 MICROPOWER, ULTRA-SENSITIVE HALL EFFECT SWITCH Pin Descriptions Pin Name P/I/O Pin Description Out 2 O 1 Output Pin ( active Low ) (Note 1) GND P/I 2 Ground NC 3 No Connection Vdd P/I 4 Power Supply Voltage Out 1 O 5 Output Pin ( active Low ) (Note 1) Notes: 1. Output1 responds to South pole Output2 responds to North pole. Functional Block Diagram Vdd Power switch Hall Plate Latch Amp Out1 GND Logical Vdd Hall Plate Amp Latch Out2 GND Absolute Maximum Ratings (T = 25 C) A Symbol Characteristics Values Unit Vdd Supply voltage 5 V B Magnetic flux density Unlimited T Storage Temperature Range -65 to +150 C S P Package Power Dissipation 230 mW D T Maximum Junction Temperature 150 C J Recommended Operating Conditions (T = 25C) A Symbol Parameter Conditions Rating Unit Vdd Supply Voltage Operating 1.65 to 3.3 V T Operating Temperature Range Operating -40 to +85 C A 2 of 7 August 2010 AH1887 Diodes Incorporated www.diodes.com Document number: DS31313 Rev. 4 - 2