605-00005 Parallax

10-Bit ADC 4-Bit ADC MLX90217 Hall-Effect Cam Sensor Features and Benefits Rotary Position Gear Tooth Sensor Short Circuit Protection On-chip 10 bit A/D Converter Self-Adjusting Magnetic Range High Speed Operation No Chopper Delay Zero Speed Detection No Rotary Orientation Concerns Applications Camshaft Sensor Geartooth Sensor Linear Encoder Rotary Encoder Direction Detection* *See applications example Ordering Information Part No. Temperature Suffix Package Code o o MLX90217 L (-40 C to 150 C) UA (TO-92 flat) Functional Diagram Description The MLX90217 is a self adjusting digital output rotary position gear tooth sensor designed for use in automotive camshaft sensing as well as other Hall Plate speed sensing applications. It is designed to be used with a bias magnet south facing the back Amplifier (non-marked) side of the IC. The device has an open collector output which is short circuit protected. The MLX90217 is a sophisticated IC featuring an Logic on-chip 10-bit A/D Converter and logic that acts as a digital sample and hold circuit. A separate 4- bit A/D converter provides a fixed hysteresis. The Voltage Protected 90217 does not have a chopper delay. The 90217 Regulator Output uses a single Hall plate which is immune to rotary alignment problems. The bias magnet can be from 50 to 400mT. 1 2 3 As the signal is sampled, the logic recognizes an increasing or decreasing flux density. The output Pin 1 - V (Supply) DD will turn on (BOP) after the flux has reached its Pin 2 - V (Ground) SS peak and decreased by an amount equal to the Pin 3 - Output hysteresis. Similarly the output will turn off (BOP) Note: Static sensitive device, please observe ESD after the flux has reached its minimum value and precautions. increased by an amount equal to the hysteresis. 3901090217 Page 1 Jun/04 Rev. 009 MLX90217 Hall-Effect Cam Sensor MLX90217 Electrical Specifications o o DC Operating Parameters T = -40 C to 150 C, V = 3.5V to 24V (unless otherwise specified). A DD Parameter Symbol Test Conditions Min Typ Max Units Supply Voltage VDD Operating 3.5 - 24 V Supply Current I V = 12V 1.5 3.0 4.5 mA DD DD Supply Current IDD VDD = 3.5V to 24V 1 - 6 mA Leakage Current I V = 3.5V to 24V - - 10 LEAK OUT A Output Current IOUT Operating - - 25 mA Output Saturation Voltage V V = 12V, I = 25mA - - 600 mV SAT DD OUT Output Short Circuit Current IFAULT Fault 50 100 150 mA Output Short Circuit Shutdown T Fault 100 - 200 S FAULT Clock Frequency f Operating 300 500 800 kHz CLK Output Rise Time t V =12V R = 880W C = 20pf - 400 nS r DD 1 1 Output Fall Time t V =12V R = 880W C = 20pf - 400 nS f DD 1 1 Bandwidth BW Operating - - 15 kHz o Thermal Resistance R Operating - - 200 C/Watt TH MLX90217 Magnetic Specifications o o DC Operating Parameters T = -40 C to 150 C, V = 3.5V to 24V (Unless otherwise specified) A DD Parameter Symbol Test Conditions Min Typ Max Units Back Bias Range B Operating -30 - 400 mT BIAS Linear Region V = 12V 50 - 500 mT DD Hysteresis B V = 3.5V to 24V 1.8 3.5 10 mT hys DD Notes: 1 mT = 10 Gauss 3901090217 Page 2 Jun/04 Rev. 009 j