Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch General Description Features The AH9248 is an ultra-sensitive Hall-effect switch with digital latched output, mainly designed for battery-operation, hand-held equipments. • • • Special CMOS process is used for low-voltage and low-power requirement. A chopper stabilized amplifier improves stability of magnetic switch points. A sleep-awake logic controls the IC in sleep time or awake time. This function will reduce the average operating current of the IC. During the awake time, the output is changed with the magnetic flux density. During the sleep time, the output is latched in its previous state and the current consumption will reduce to some μA. • • • • AH9248 Micropower Operation 2.5 to 5.5V Power Supply Switching for Both Poles of a Magnet (Omnipolar) Stabilized Chopper Superior Temperature Stability Digital Output Signal Built-in Pull-up Resistor (AH9249) Applications • • • The IC switching behaviour is omnipolar, either north or south pole sufficient strength will turn the output on. If the magnetic flux density is larger than operating point (BOP), the output will be turned on; if it is less than releasing point (BRP), the output will be turned off. Cover Switch in Notebook PC/PDA Handheld Wireless Application Awake Switch Magnet Switch in Low Duty Cycle Applications The AH9248 is available in TO-92S-3, SOT-23-3 and DFN-2×2-3 packages which are optimized for most applications. TO-92S-3 SOT-23-3 DFN-2×2-3 Figure 1. Package Types of AH9248 Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 1 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Pin Configuration OUTPUT 2 GND 1 VCC GND 2 3 OUTPUT 1 N Package (SOT-23-3) VCC 3 Z3 Package (TO-92S-3) (Front View) (Top View) DN Package (DFN-2×2-3) Pin 1 Dot by Marking VCC 1 3 OUTPUT GND 2 (Top View) Figure 2. Pin Configuration of AH9248 Pin Description Pin Number Pin Name Function TO-92S-3 SOT-23-3 DFN-2×2-3 1 1 1 VCC Power supply pin 2 3 3 GND Ground pin 3 2 2 OUTPUT Output pin Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 2 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Functional Block Diagram A (B) A for TO-92S-3 B for SOT-23-3 and DFN-2×2-3 Figure 3. Functional Block Diagram of AH9248 Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 3 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Ordering Information AH9248 - G1: Green Circuit Type Blank: Bulk TR: Tape and Reel or Ammo Package Z3: TO-92S-3 N: SOT-23-3 DN: DFN-2×2-3 Package Temperature Range Part Number Marking ID Packing Type AH9248Z3-G1 9248 Bulk AH9248Z3TR-G1 9248 Ammo AH9248NTR-G1 GL1 Tape & Reel AH9248DNTR-G1 JA Tape & Reel TO-92S-3 -40 to 85°C SOT-23-3 DFN-2×2-3 BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 4 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Absolute Maximum Ratings (TA=25°C, Note 1) Parameter Symbol Value Unit Supply Voltage VCC 7 V Supply Current (Fault) ICC 6 mA Output Voltage VOUT 7 V Output Current IOUT 2 mA Magnetic Flux Density B Unlimited Gauss Power Dissipation PD TO-92S-3 SOT-23-3 DFN-2×2-3 400 230 230 mW Storage Temperature TSTG -55 to 150 °C Junction Temperature TJ 150 °C ESD 200 V ESD (Machine Model) (Note 2) Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Note 2: Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products. Recommended Operating Conditions Parameter Symbol Min Max Unit Supply Voltage VCC 2.5 5.5 V Operating Temperature TOP -40 85 °C Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 5 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Electrical Characteristics VCC =3V, TA =25°C, unless otherwise specified. Parameter Supply Voltage Supply Current Symbol Conditions Min Typ Max Unit 2.5 3 5.5 V VCC Operating IAW Awake 2 4 mA ISL Sleep 6 10 μA IAVG Average 10 15 μA 1.0 mA 1 μA 0.4 V Output Current IOUT Output Leakage Current ILEAK B<︱BRP︱ Saturation Voltage VSAT IOUT =1.0mA Awake Mode Time tAW Operating 150 Sleep Mode Time tSL Operating 90 Duty Cycle D 0.15 % Chopper Frequency fC 15 kHz <0.1 μs 120 ms Magnetic Characteristics (Note 3) VCC =3V, TA=25°C, unless otherwise specified. Parameter Symbol BOPS Operating point BOPN BRPS Releasing Point BRPN Hysteresis BHYS Conditions South pole to branded side B>BOPS,VOUT=low(output on) North pole to branded side B>BOPN,VOUT=low(output on) South pole to branded side B<BRPS,VOUT=high(output off) North pole to branded side B<BRPN,VOUT=high(output off) ︱BOPX - BRPX︱(Note 4) Min Typ Max Unit 30 55 Gauss -55 -30 Gauss 5 20 Gauss -20 10 -5 Gauss Gauss Note 3: The specifications stated here are guaranteed by design. 1 Gauss=0.1mT Note 4: BOPX=operating point(output turns on); BRPX=releasing point(output turns off) Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 6 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Output Voltage Magnetic Characteristics (Continued) Figure 4. Output Voltage vs. Magnetic Flux Density Test Conditions Figure 5. Average Supply Current (Note 5, 6) Note 5: ICC represents the average supply current. OUTPUT is open during measurement. Note 6: The device is put under magnetic field with B<BRP. Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 7 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Test Conditions (Continued) Figure 6. Output Saturation Voltage (Note 7, 8) Note 7: The output saturation voltage VSAT is measured at VCC=2.5V and VCC=5.5V. Note 8: The device is put under magnetic field with B>BOP. Figure 7. Magnetic Thresholds (Note 9, 10) Note 9: BOP is determined by putting the device under magnetic field swept from BRP(min) to BOP(max) until the output is switched on. Note 10: BRP is determined by putting the device under magnetic field swept from BOP(max) to BRP(min) until the output is switched off. Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 8 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Typical Performance Characteristics 50 50 40 TA=25 C 30 30 20 20 10 BOP1 0 BOP2 -10 BRP1 BOP/BRP (GS) BOP/BRP (GS) 40 o -20 -30 -30 -40 -40 3.00 3.25 BRP1 -10 BRP2 2.75 BOP2 0 -20 -50 2.50 BOP1 10 BRP2 -50 -40 3.50 -30 -20 -10 0 10 20 30 40 50 60 70 80 O TA ( C) VCC (V) Figure 8. BOP/BRP vs. Supply Voltage Figure 9. BOP/BRP vs. Ambient Temperature 300 15 14 o o 250 TA=25 C TA=25 C 13 200 tAW (μs) IAVG (μA) 12 11 10 150 100 9 8 50 7 6 2.50 2.75 3.00 3.25 0 2.50 3.50 3.00 3.25 3.50 VCC (V) VCC (V) Figure 10. Average Supply Current vs. Supply Voltage Jul. 2011 2.75 Figure 11. Awake Mode Time vs. Supply Voltage Rev. 1. 6 BCD Semiconductor Manufacturing Limited 9 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Typical Performance Characteristics (Continued) 450 120 400 110 350 100 300 PD (mW) tSL (ms) TO-92S-3 SOT-23-3/DFN-2X2-3 o TA=25 C 90 80 250 200 150 70 100 60 50 2.50 50 0 2.75 3.00 3.25 0 3.50 25 50 75 100 125 150 O TA ( C) VCC (V) Figure 12. Sleep Mode Time vs. Supply Voltage Jul. 2011 Figure 13. Power Dissipation vs. Ambient Temperature Rev. 1. 6 BCD Semiconductor Manufacturing Limited 10 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Typical Application Figure 14. Typical Application of AH9248 Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 11 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Mechanical Dimensions TO-92S-3 Unit: mm(inch) ° ° Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 12 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Mechanical Dimensions (Continued) SOT-23-3 Unit: mm(inch) 2.820(0.111) 3.020(0.119) 0.100(0.004) 0.200(0.008) 0.300(0.012) 0.600(0.024) 2.650(0.104) 2.950(0.116) 1.500(0.059) 1.700(0.067) 1.45(0.057) TYP 0.200(0.008) 0.900(0.035) TYP 1.800(0.071) 2.000(0.079) 0 8 0.300(0.012) 0.500(0.020) 1.450(0.057) MAX. 0.950(0.037) TYP ° ° 0.000(0.000) 0.150(0.006) 0.900(0.035) 1.300(0.051) Jul. 2011 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 13 Data Sheet High Sensitivity Micropower Omnipolar Hall-Effect Switch AH9248 Mechanical Dimensions (Continued) DFN-2×2-3 Unit: mm(inch) 1.220(0.048) 1.420(0.056) 1.900(0.075) 2.100(0.083) 0.300(0.012) 0.500(0.020) N3 Package Sensor Location (For Hall IC) 1.900(0.075) 2.100(0.083) 0.780(0.031) 0.980(0.039) Pin 1 Dot by Marking N2 0.850(0.033) 1.150(0.045) 0.990(0.039) 1.290(0.051) 0.650(0.026) TYP N1 0.200(0.008) MIN. 0.700(0.028) 0.800(0.031) 0.180(0.007) 0.300(0.012) Jul. 2011 0.000(0.000) 0.050(0.002) 0.203(0.008) REF Rev. 1. 6 BCD Semiconductor Manufacturing Limited 14 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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