AH373 INTERNAL PULL-UP HALL EFFECT LATCH Description Pin Assignments AH373 is a single-digital-output Hall-Effect latch sensor with internal (TOP View) pull-up resistor for high temperature operation. The device includes an on-chip Hall voltage generator for magnetic sensing, an amplifier to amplify Hall voltage, and a comparator to provide switching hysteresis for noise rejection, and an output driver with a pull-up resistor. An internal band-gap regulator provides a temperature SC59 and SOT23 compensated supply voltage for internal circuits and allows a wide operating supply range. (TOP View) When the magnetic flux density (B) perpendicular to the package is 3. OUT larger than operate point (Bop), output is switched on (OUT pin is 2. GND pulled low). The output state is held on until a magnetic flux density reversal falls below Brp. When B is less than Brp, the output is 1. V DD switched off. SIP-3L The AH373 is available in SIP-3L, SC59 and SOT23 packages. Features Applications Bipolar Hall Effect Latch Operation Rotor Position Sensing for Motor Commutation 2.2V to 20V Operating Range Encoder Single Output with Built-in Pull-up Resistor Speed Measurement RPM Monitor 25mA output Sink Capability Contact-less Current Switch -40 C to +125C Operating Temperature Industry Standard SIP-3L, SC59 and SOT23 Packages 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 AH373 Typical Application Circuits (cont.) Typical AH373 Circuit Note: 4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical IN Pin Descriptions Package: SC59, SOT23 and SIP-3L Pin Number Pin Name Function 1 V Power Supply Input DD 2 GND Ground 3 OUTPUT Output Functional Block Diagram V DD 1 Rpu Regulator 3 OUTPUT 2 Hall plate Amp 2 GND 2 of 12 September 2013 AH373 Diodes Incorporated www.diodes.com Document number: Draft DS31173 Rev. 11 - 2