MT6303 Series Omni-polar, Low Power, MR Switch Sensor

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Homer Booth
5 years ago
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1 Feature AMR+CMOS monolithic structure High sensitivity B OP = 18Gauss, B RP = 13Gauss Low power consumption Average supply current <1.3uA (Typical) Wide operating temperature range -40~125 C Open-drain Output RoHs compliant 2011/65/EU Application Position Detection Proximity Detection Speed Detection Flow meters including water meter, gas meter and heat meter Product Description The MT6303 is a monolithic IC with built-in MR magneto-resistive element and CMOS switch. The IC internally includes a MR bridge, a voltage regulator for operation with supply voltage from 1.8V to 5.5V, a sleep/awake logic for low power consumption, small signal amplifier and Schmitt trigger comparator with dynamic offset cancellation, and an output driver with open-drain output. When combined with a magnet, it becomes a non-contact switch with low current consumption, high sensitivity and reliability. A horizontal magnetic field parallel to the electrode of the package can be detected by an arbitrary polarity. The MT6303 is ideal for use to gather speed and detect position, particularly suited for applications that require accurate duty cycle or accurate edge detection and low power consumption such as speed detection in smart meters. Pin definition Name Number Description VDD 1 Power Supply GND 2 Ground OUT 3 Output Signal Family members Part Number MT6303A MT6303AT Description Flat TO-92 package, bulking packaging(1000pcs/bag) SOT-23 package,tape and reel packaging(3000pcs/bag) 1 / 8

2 Block Diagram VDD Regulator Sleep/Awak e Logic Dynamic offset cancellation ESD ESD OUT R1 R2 AMP COMP Output Driver ESD R3 R4 GND Function Description Definition of magnetic parameters B OP : Operating point, magnetic flux density that turns the output driver ON (V OUT =Low) B RP : Release point, magnetic flux density that turns the output driver OFF (V OUT =High) B HYST : Hysteresis window, B OP -B RP Definition of Switching Function V OUT (V) V OUT (V) North Pole B OP (N) B RP (N) 0 0 B RP (S) B OP (S) South Pole 2 / 8

Drawing Illustrating Detectable Magnetic Field Flat TO-92 package SOT-23 package Detection of magnetic field To operate the MR switch, the magnetic field

MT6303 series are designed to be ON-state (Low-level output) when the horizontal direction magnetic field is applied in parallel to the marked side of

MT6303 series detect the horizontal direction magnetic field, and it does not respond to vertical direction magnetic field.

impaired.functional operability is not necessarily implied.

3 Drawing Illustrating Detectable Magnetic Field Flat TO-92 package SOT-23 package Detection of magnetic field To operate the MR switch, the magnetic field should be applied to the sensor with sufficient magnetic flux density and correct direction. MT6303 series are designed to be ON-state (Low-level output) when the horizontal direction magnetic field is applied in parallel to the marked side of sensor, with sufficient magnetic flux (B OP value) regardless of polarity of magnet. MT6303 series detect the horizontal direction magnetic field, and it does not respond to vertical direction magnetic field. Absolute Maximum Rating Absolute maximum ratings are limiting values to be applied individually, and beyond which the serviceability of the circuit may be impaired.functional operability is not necessarily implied. Exposure to absolute maximum rating conditions for an extended period of time may affect device reliability. Absolute maximum ratings: all voltages listed are referenced to GND Symbol Parameters Min Max Unit V DD Supply Voltage V I OUT Continuous Output Current - 10 ma V OUT Output voltage V B Magnetic flux Gauss T A Operating Temperature Range C T S Storage Temperature Range C 3 / 8

4 Electrical Characteristics At TA=-40 C to 125 C, V DD =1.8V to 5.5V (Unless other specified) Symbol Parameters Test Conditions Min Typ Max Units V DD Supply voltage Operating V I DD Supply current V DD =3.6V ua V OL Output low voltage I OUT =5mA, B > B OP V V OH Output high voltage I OUT =5mA, B < B RP V DD V I OFF Output leakage current V OUT =5.5V, B < B RP ua T PO 1 Power on time dv S /dt>3.6v/us, B>B OP(MAX) us Fsw 1 Switching frequency V DD =3.6V Hz T AW 1 T SL 1 Awake Time V DD =3.6V us Sleep Time V DD =3.6V ms D.C. 1 Duty Cycle V DD =3.6V % RTH Flat TO-92package thermal resistance SOT-23package thermal resistance C/W C/W ESD Electro-Static Discharge AEC-Q100 Class 3 1 Guaranteed by device design and characterization Magnetic Characteristics At V DD =1.8V to 5.5V Symbol Parameters Test Conditions Min Typ Max Units B OP Magnetic operating point At TA=25 C - ±18 ±25 Gauss B RP Magnetic release point At TA=25 C ±3 ±13 - Gauss B HYST Hysteresis window At TA=25 C, B OP -B RP Gauss 4 / 8

5 Characteristic Performance MT6303 Electrical Characteristics Average Supply Current versus Temperature Magnetic Characteristics versus Temperature (V DD =3.6V) Magnetic Characteristics versus Supply Voltage Hysteresis window versus Temperature (T A =25 C) (V DD =3.6V) 5 / 8

6 Application Information Typical Application Circuit Operating Waveform Power On Output Waveform Note: V DD rise time <1us, Tpo is the time from V DD becoming stable to output becoming valid. 6 / 8

7 PACKAGE DESIGNATOR (MT6303A) Flat TO-92 Symbol Dimensions in Millimeters 7 / 8 Dimensions in Inches Min Max Min Max A A b b C D D E e TYP TYP e L x 2.025TYP 0.080TYP y 1.545TYP 0.061TYP z 0.500TYP 0.020TYP θ 45 TYP 45 TYP

8 PACKAGE DESIGNATOR (MT6303AT) SOT-23 Symbol Dimensions in Millimeters 8 / 8 Dimensions in Inches Min Max Min Max A A A b c D E E e TYP TYP e L x 1.460TYP 0.057TYP y 0.800TYP 0.032TYP z 0.600TYP 0.024TYP θ

MT6325 Series Omni-polar, Low Power, MR Switch Sensor

MT6325 Series Omni-polar, Low Power, MR Switch Sensor Feature MR+CMOS monolithic structure High sensitivity B OP = 17Gauss, B RP = 14Gauss Low power consumption Average supply current