AH37 Series CMOS Bipolar Latch Hall Effect Sensor

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Alicia Harris
6 years ago
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1 AH37 Series CMOS Bipolar Latch Hall Effect Sensor Outline AH37 Series Hall sensor is a digital output Hall IC based on CMOS process, bipolar excitation, with latch function in the output signal. The sensor chip is made based on CMOS process, has lower power consumption, with built-in reverse voltage protection, voltage regulators, temperature compensation circuit, Hall voltage generator, Schmitt trigger and output driver etc circuit unit. Excellent voltage regulator and temperature compensation circuit ensure the sensor s stable operation within a wide voltage range and temperature range, the reverse voltage protection circuit avoids the sensor to be damaged by reverse voltage. Magnetic and electric transfer characteristic Bipolar Latch Hall Effect Sensor Magnetic and Electric Transfer Characteristic: When the S pole of magnet faces the mark surface of the sensor and is closed to sensor(b Bop),the sensor outputs low level; When the N pole faces the mark surface and is closed to sensor (B Brp),the sensor outputs high level. When the magnet if far away with the sensor (B=0), the output status of the sensor is latched and remains constant. In order to change the output status, the applied magnetic field must be opposite polarity. The latch function enables the sensors more stable switch state. The bipolar latch Hall effect sensor s magnetic and electric transfer characteristic curve is shown as the figure: Vcc Vo Bh Vo -B -B Brp 0 Bop +B

2 Ordering Information Parts No. and order mark AH Operating Temperature code Package form code Part No. code Company trademark code Company trademark code: AH Nanjing AH Electronic Science & Technology CO.,LTD Parts No. code 37 Bipolar single end digital output series XX Type. No. Package form code M SOT-23-3L(SMD) S SOT-89(SMD) UA TO-92UA/TO-92S(DIP) Note: M and S type are in reel, M type is 3k pcs/reel, S type is 1kpcs/reel, UA type is in bag, 1kpcs/bag or 0.5kpcs/bag. Operating Tempt. Code: E -20 ~+85 L -40 ~+150

3 Features: Rated working voltage 2.5 V~16 V, the limit voltages as low as 2.0 V; switch signal stability, no shaking moment, high reliability and safety; Operating temperature range: -30 ~ Latch function enables the sensor s strong 100 ; immunity from interference and more stable Rated output current(sink) : 10 ma,the switch status. maximum output current(sink): 20 ma; Strong Resistant to mechanical stress and Switch response time is about 1μs, the thermal stress capability; operating frequency DC ~ 100 khz; It can connect directly to digital circuit; Small drift between operating point Products meet the EU RoHS instruction and release point temperature; 2011/65 / EU and REACH regulations There has variety of magnetic 1907/2006 / EU requirements. induction sensitivity options; Variety of packages and outer packing options; No mechanical contact, no spark, Application Contactless switch Brushless DC motor Position detection and control Liquid level alarm Flowmeter; air velocity transducer DC Brushless Fan Speed detection Electronic meter Heat meter Current alarm Rain gauge Smart Home appliance Magnetic Encoder;

4 Limit Condition Parameter Symbol Min. Limit Value Max Unit Storage Temp. Ts Power Supply V CC V Magnetic Strength B unlimited unlimited mt(note) Output off-state Voltage V O (off) 18 V Output(sink)Current I O 20 ma Note:Unit is mt,1mt (mt)=10(gs),the same below Operating Condition Value Parameter Symbol Min. Max. Unit Supply Voltage V CC V Operating Temp. TA Output Current I O 15 ma

5 Electrical Characteristic Parameter Symbol Test Condition Typ. Value Max. Unit Output low level voltage V OL V CC1 = 4.5V,V CC2 =16V, I O =15mA,B B OP V Output leak current I OH V CC2 =16 V,V CC1 Open Circuit μa Supply Current I CC V CC1 =16V,V O Open Circuit 5 10 ma Output rise time Output fall time t R t F V CC1 =V CC2 =5V, R L =0.82kΩ,C L =20pF μs Magnetic Characteristic Excitation and Switch mode Type Package BOP BRP BH Max Min. Min. Max. AH3701(AH3601) M,UA Bipolar latch type AH3702(AH3602B) M AH3707(AH72X-B) UA Note 1: Pole S is vertical to the mark surface of the product,the field defined into B>0 Note2: More information about our product please visit our website: or call us. Note3: The operating field of M type (SOT23-3L) is subject to pole N.

6 Block Diagram Vcc Voltage Regulator Vo Hall effect Element Differential Amplifier Schmitt Trigger Output Stage GND Pin Function Pin No. Pin Symbol Pin Name Function When B B OP When B B RP 1 Vcc Supply Voltage Power Supply(+) 2 GND Ground Power Supply(-) 3 Vo Output Low Level High Level

7 Icc(mA) VoL (V) Typical application circuit Vcc1 Vcc2 RL 1 C 3 Vo 2 GND Note: a) C is filter capaciter,c=0.1μf; b) RL is pull-up resistor,rl=1kω~50kω c) Vcc2 work with Vcc1short circuit. Typical Characteristic Curve Electrical Characteristic Vcc=16V Vcc=16V Io=15mA Ta( ) Ta ( ) Supply current Ambient Temp. curve Output low level voltage Ambient Temp. curve

8 Switch Point (mt) Swich Point (mt) Switch Point (mt) Magnetic Characteristic Bh Bh 5 0 Bop 5 0 Bop Brp Brp Ta ( ) AH3701 Switch point Ambient Temp. curve Ta ( ) AH3702 Switch point Ambient Temp.curve 20 Bh Bop Brp Ta ( ) AH3707 Switch point Ambient Temp. Curve

9 Package Outline and Pin Identify SOT-23-3L(M Type)Package Figure(Unit:mm) TO-92UA/TO-92S(UA type)package Figure(Unit:mm) Note: In the package outline figure, Pin 1 is Vcc, Pin 2 is GND, Pin 3 is output

10 Mark Mark XX or AHXX means abbreviated parts No., the second line XXXX means product lot No. Pin configuration a) M Type: It faces product mark, and two pins are downward, towards the left, clockwise, the pin No. is in turn. b) UA Type: It faces product mark, and the pins are downward, from left to right, the pin No. is in turn. Important Declaration The document s version is Aug 2013, and the copyright belongs to Nanjing AH Electronic Science & Technology CO.,Ltd. The description about product function in the document meets our company s product specification. In order to improve the design and reliability, our company reserve the right, from time to time, to update the product function specification. Before ordering, the user needs to carefully check the information that depends on is correct. The information in the document is believed to be correct and reliable. Our company assumes no responsibility for its use, nor for any infringement of patents or other rights of third parties which may result from its use.

AH30 Series Bipolar Latch Hall Effect Sensor

AH30 Series Bipolar Latch Hall Effect Sensor Outline AH30 Series Hall sensor is one of bipolar excitation single-ended digital output Hall IC. The sensor chip has built-in reverse voltage protection, voltage