AH8501 HIGH ACCURACY LOW POWER / MICROPOWER LINEAR HALL EFFECT SENSOR Description Pin Assignments The AH8501 is a high accuracy, low power/micropower linear Hall effect sensor with an 8-bit output resolution. The output voltage is (Top View) ratiometric to the supply voltage and proportional to the magnetic flux density, perpendicular to the part marking surface. The output null voltage is at half the supply voltage. AH8501 is a trimmed device with typical sensitivity of 2.25mV/G and 3.8mV/G at 1.8V and 3V respectively with an accuracy of 3% at 25C. The device has a typical input referred rms noise of 0.36G and 0.24G at 1.8V and 3.0V. Designed for battery powered consumer equipment to office equipment, home appliances and industrial applications, the AH8501 can operate over the supply range of 1.6V to 3.6V and uses an U-DFN2020-6 externally controlled ENABLE pin clocking system to control operating modes and sampling rates to minimize the power consumption. The typical average operating supply current is between 8.9A during sleep mode and 1.16mA at maximum sampling rate at 1.8V. With a Applications conversion pulse every 50ms at the ENABLE pin, the device achieves a micropower operation with the power consumption of 22W typical High Accuracy Level, Proximity, Position and Travel Detection at 1.8V supply. Button Press Detection in Digital Still, Video Cameras and Handheld Gaming Consoles To minimize PCB space the AH8501 are available in small, low profile Accurate Door, Lids and Tray Position Detection U-DFN2020-6. Liquid Level Detection Joy Stick Control Gaming and Industrial Applications Features Contact-Less Level, Proximity and Position Measurement in Home Appliances and Industrial Applications High Accuracy Linear Hall Effect Sensor with +/-400G Sense Range and Output Voltage with 8-bit resolution Supply Voltage of 1.6V to 3.6V High Accuracy: Trimmed Sensitivity of 2.25mV/G and 3.8mV/G at 1.8V and 3V Respectively with Accuracy of 3% at +25C Low Offset Voltage Low Average Supply Current 8.9A Typical in Sleep Mode (Default) at 1.8V 1.01mA Typical in Auto-Run Mode (6.25kHz) at 1.8V 12A Typical in External Drive Mode with 20Hz Sample Rate at 1.8V 1.16mA Typical in External Drive Mode with 7.14kHz Sample Rate at 1.8V Chopper Stabilized Design with Superior Temperature Stability, Minimal Sensitivity Drift, Enhanced Immunity to Physical Stress Output Voltage Maintained at Sleep Mode -40C to +85C Operating Temperature High ESD Capability of 6kV Human Body Model Small Low Profile U-DFN2020-6 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AH8501 Typical Applications Circuit Note: 4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical and should be placed as close to IN the supply pin as possible. Pin Descriptions Package: U-DFN2020-6 Pin Number Pin Name Function 1 OUTPUT Output Pin 2 NC No Connection (Note 5) 3 V DD Power Supply Input Device Awake and Sleep control pin: An external PWM signal to the ENABLE pin controls the operating modes (Sleep Mode, Auto-Run Mode and External Drive Mode), awake and sleep periods to adjust the sampling rate and to minimize the power consumption to achieve micropower operation. When the ENABLE = GND continuously the device is in sleep mode consuming only 8.9A typical at 1.8V. When the ENABLE pin is left floating, the device defaults to sleep mode. The ENABLE pin is internally pulled low. 4 ENABLE When ENABLE = V (or Logic High) continuously, device is in auto-run DD mode with sampling rate of 6.25kHz typical consuming 1.01mA at 1.8V In external drive mode, an external PWM signal can be used to drive the ENABLE pin to adjust the sampling frequency up to 7.14kHz typical. A minimum pulse width needed on ENABLE pin to start one Awake/Sleep cycle (i.e. one sample/conversion cycle) is 20s typical. We recommended using a pulse width of 40s minimum. The minimum awake period for one sample/conversion cycle is140s typical. 5 GND Ground Pin 6 NC No Connection (Note 5) The center exposed pad No connection internally. Pad Pad The exposed pad can be left open (unconnected) or tied to the GND on the PCB layout. Note: 5. NC is No Connection pin and is not connected internally. This pin can be left open or tied to ground. 2 of 19 February 2015 AH8501 Diodes Incorporated www.diodes.com Document number: DS37512 Rev. 1 - 2 PRELIMINARY - CONFIDENTIAL