ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 1 of 9 www.diodes.com june 2011 ? diodes incorporated new product 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 12a 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. the output is activated with ei ther 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) . 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 package ? esd (hbm) 5kv ? ?green? molding compound pin assignments 2 4 1 v dd nc output gnd ( top view ) dfn1216-4 3 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 products typical application circuit ah1804 2.5v to 3.6v output gnd cin note: cin is for power stabilization and to strengthen th e noise immunity, c = 100nf or higher must be used. v dd
ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 2 of 9 www.diodes.com june 2011 ? diodes incorporated new product pin descriptions notes: 1. nc is ?no connection? which is not connected internally. this pin can be left open or tied to ground. functional block diagram output driver controller latch latch sleep/awake logic and power switch v dd hall plate amp hall plate amp output gnd offset cancellation offset cancellation absolute maximum ratings (t a = 25 c, note 2) symbol characteristics values unit v dd supply voltage (note 3) 5.0 v v dd rev reverse supply voltage -0.3 v b magnetic flux density unlimited ts storage temperature range -65 to +150 c p d package power dissipation dfn1216-4 230 mw t j maximum junction temperature 150 c notes: 2. absolute maximum ratings are those values beyond whic h the life of a device may be impaired. exposure to absolute m aximum rating condition for extended periods may affect device reliability. 3. the absolute maximum of 5v is a transient stress rating and is not meant as functional operating conditions. it is not rec ommended to operate the device at the absolute maximum rated conditions for any period of time. pin name p/i/o description v dd p/i power supply input gnd p/i ground output o output pin nc nc no connection (note 1)
ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 3 of 9 www.diodes.com june 2011 ? diodes incorporated new product recommended operating conditions (t a = 25 c) symbol characteristics conditions rating unit v dd supply voltage c in =0.1f (note 4) 2.5 to 3.6 v t a operating temperature rang e operating -40 to +85 c notes: 4. decoupling capacitor c in = 100nf or higher must be used for full 2.5v to 3.6v supply range . electrical characteristics (t a = 25 c, v dd = 3.3v, unless otherwise specified) symbol characteristics conditions min typ. max unit v ol output low voltage (on) i out = 1ma ? 0.1 0.2 v v oh output high voltage (off) i out = -1ma v dd -0.2 v dd -0.1 ?? v idd(en) s upply current chip enable ? 4 ? ma idd(dis) chip disable ? 8 ? a idd(avg) average supply current, ? 12 ? a tawake awake time (note 5) ? 50 100 s tperiod period (note 5) ? 50 100 ms d.c. duty cycle ? 0.1 ? % notes: 5. when power is initially on, the operating v dd (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).
ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 4 of 9 www.diodes.com june 2011 ? diodes incorporated new product magnetic characteristics (t a = 25 c, v dd = 3.3v, note 6) (1mt=10 gauss) symbol characteristics min typ. max unit bops(south pole to brand side) operation point 20 40 60 gauss bopn(north pole to brand side) -60 -40 -20 brps(south pole to brand side) release point 15 32 - brpn(north pole to brand side) - -32 -15 bhy (|bopx|-|brpx|) hysteresis 8 - notes: 6. the magnetic characteristics may vary with operating temperature and after soldering. b hy v sat v cc ( output voltage ) b opn b rpn 0 ( magnetic flux density b ) output turn on turn off ( off-state ) ( on-state ) b hy v sat v cc ( output voltage ) b rps b ops 0 ( magnetic flux density b ) output turn off turn on ( off-state ) ( on-state )
ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 5 of 9 www.diodes.com june 2011 ? diodes incorporated new product typical characteristics typical switch point bop and brp vs. temperature typical switch points bop and brp vs. supply voltage average supply current vs. temperature average supply current vs. supply voltage
ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 6 of 9 www.diodes.com june 2011 ? diodes incorporated new product ordering information ah1804 - fa - 7 x package fa : dfn1216-4 7 : tape & reel magentic characteristics - blank : option 1 (note 7) packing device (note 8) package code packaging (note 9) 7? tape and reel magentic characteristics (note 7) quantity part number suffix AH1804-FA-7 fa dfn1216-4 3000/tape & reel -7 -blank notes: 7. please refer the magnetic characteristics table. 8. eu directive 2002/95/ec (rohs). all applicable ro hs exemptions applied. please visit our website at http://www.diodes.c om/products/lead_free.html . 9. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at http://www.diodes.c om/datasheets/ap02001.pdf marking information (1) dfn1216-4 ( top view ) xx pin 1 indicator y : year : 0~9 x : a~z : internal code xx : identification code w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week y w x part number package identification code AH1804-FA-7 dfn1216-4 kj
ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 7 of 9 www.diodes.com june 2011 ? diodes incorporated new product package outline dimensions (all dimensions in mm) (1) package type: dfn1216-4 bottom view side view 1.15/1.25 0.75/0.95 1.55/1.65 0.65typ. 0.15/0.25 0.2/0.3(4x) 0.55/0.75 0.47/0.53 0.13typ. 0.10 c 0.08 c seating plane a b c 0.10 c ab 0.25 a 2x- 0.25 b 2x- 0.175(4x) 4x 0/0.05 pin#1 (4x) c0.2 0.8 0.65typ. 0.25(4x) 1.0 top view land pattern recommendation (unit:mm) c l c l top mark 1.40 0.35(4x) hall sensor
ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 8 of 9 www.diodes.com june 2011 ? diodes incorporated new product taping orientation (note 10) dfn1216-4 notes: 10. the taping orientation of the other package type can be found on our website at http://www.diodes .com/datasheets/ ap02007.pdf.
ah1804 micropower omnipolar hall effect sensor switch ah1804 document number: ds35314 rev. 1 - 2 9 of 9 www.diodes.com june 2011 ? diodes incorporated new product important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2011, diodes incorporated www.diodes.com
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