AH8502 MICROPOWER LINEAR HALL EFFECT SENSOR Description Pin Assignments The AH8502 is a micropower linear Hall effect sensor with an 8-bit output resolution. The output voltage is ratiometric to the supply (Top View) voltage and proportional to the magnetic flux density, perpendicular to the part marking surface. The output null voltage is at half the supply 6 1 NC OUTPUT voltage. The AH8502 has a typical sensitivity of 2.1mV/G and 3.55mV/G at 2 5 NC GND 1.8V and 3V. The typical null voltage offset is less than 1% of V . DD The device has typical input referred rms noise of 0.36G and 0.24G at Exposed 1.8V and 3.0V. V 3 4 DD CNTRL Pad Designed for battery powered consumer equipment to office equipment, home appliances and industrial applications, the AH8502 U-DFN2020-6 can operate over the supply range of 1.6V to 3.6V. The device has a CNTRL pin to select the operating modes and sampling rate to minimize power consumption. The device operates in default Applications micropower mode with a sampling rate of 24Hz typical and consumes only 13A typical at 1.8V. In turbo mode with continuous 6.25kHz High Accuracy Level, Proximity, Position and Travel Detection sample rate the current consumption is 1mA typical. In external-drive Button Press Detection in Digital Still, Video Cameras and mode, the CNTRL can be used to change the sampling frequency up Handheld Gaming Consoles to 7.14KHz with current consumption of 1.16mA typical at 1.8V. Accurate Door, Lids and Tray Position Detection Liquid Level Detection To minimize PCB space, the AH8502 is available in small low profile Joy Stick Control Gaming and Industrial Applications U-DFN2020-6. Smart Meters Contact-Less Level, Proximity and Position Measurement in Home Appliances and Industrial Applications Features Linear Hall Effect Sensor with +/-430G Sense Range and Output Voltage with 8-bit Resolution Supply Voltage of 1.6V to 3.6V Sensitivity: 2.1mV/G and 3.55mV/G at 1.8V and 3V at +25C Low Offset Voltage Micropower (Default Mode), Turbo and External-Drive Modes Ultra Low Average Supply Current 13A Typical in Micropower Mode (Default) Period at 1.8V 1.01mA Typical in Turbo Mode at 1.8V 1.16mA Typical in External Drive Mode with 7.14kHz Sampling 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 AH8502 Typical Applications Circuit V DD CNTRL C AH8502 IN OUTPUT GND 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 the IN supply pin as possible. Pin Descriptions Pin Number Pin Name Function 1 OUTPUT Output Pin 2 NC No Connection (Note 5) 3 VDD Power Supply Input Device Control Pin: The CNTRL pin allows to select the modes of operation (Micropower Mode, Turbo Mode and External-Drive Mode) and to adjust the sampling rate in External Drive Mode to minimize the power consumption. When CNTRL = GND or floating, the device operates in default Micropower Mode with 24Hz sampling rate and consumes 13A typical at 1.8V. The CNTRL pin is internally pulled low. 4 CNTRL When CNTRL = V , the device is on and operates in Turbo Mode with continuous sampling rate of DD 6.25kHz typical consuming 1.01mA typical at 1.8V. In External Drive Mode, an external PWM signal can be used to drive the CNTRL pin to adjust the sampling frequency from 24Hz typical up to 7.14kHz typical. If external PWM pulse is used, the minimum pulse width needed on the CNTRL pin to start a sample/conversion is 20s typical. We recommend using a pulse width of 40s minimum. The minimum sample and 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 gro und. 2 of 19 AH8502 February 2015 Diodes Incorporated www.diodes.com Document number: DS37683 Rev. 1 - 2 NEW PRODUCT