AH373-WG-7

AH373 INTERNAL PULL-UP HALL EFFECT LATCH Description AH373 is a single-digital-output Hall-Effect latch sensor with 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 bandgap regulator provides a temperature compensated supply voltage for internal circuits and allows a wide operating supply range. When the magnetic flux density (B) is larger than operate point (Bop), output is switched on (OUT pin is 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 switched off. The AH373 is available in SIP-3L and SC59 packages. Pin Assignments (Top View) 3. OUT 2. GND 1. Vdd SIP-3L (Top View) 3. OUT GND 2. 1. Vdd SC59 Features • • • • • • • Bipolar Hall-Effect latch sensor 2.2V to 20V DC operating voltage Built-in pull-up resistor 25mA output sink current Operating temperature: -40°C ~ +125°C SIP-3L and SC59 packages (SC59 is commonly known as SOT23 in Asia) Green Molding Compound (No Br, Sb) (Note 1) Applications • • • • Rotor Position Sensing Current Switch Encoder RPM Detection Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit IA IB M Digital Hall Effect Sensor Driver & Control Logic IC Ia Ib Ic RPM sensing M: Three Phase Hall Motor HA HB HC Hall Motor Driver 3 Phase Hall Motor AH373 Document number: DS31173 Rev. 6 - 2 1 of 9 www.diodes.com July 2010 © Diodes Incorporated AH373 INTERNAL PULL-UP HALL EFFECT LATCH Pin Descriptions Pin Name Vdd GND OUT P/I/O P P O Pin # 1 2 3 Description Positive Power Supply Ground Output Pin Functional Block Diagram Vdd 1 Regulator Hall plate Amp Rpu 3 2 OUT 2 GND Absolute Maximum Ratings (TA = 25°C) Symbol Vdd VOUT (off) IO (sink) Ts PD Characteristics Supply Voltage Output “Off” Voltage Output “On” Current Storage Temperature Range Power Dissipation SIP-3L SC59 Values 20 28 25 -65~+150 550 230 Unit V V mA °C mW mW Recommended Operating Conditions Symbol Vdd TA Notes: Parameter Supply Voltage (Note 2) Operating Ambient Temperature Conditions Operating Operating Min 2.2 -40 Max 20 125 Unit V °C 2. The output of IC will be switched after the supply voltage is over 2.2V, but the magnetic characteristics won't be normal until the supply is over 2.5V. 2 of 9 www.diodes.com July 2010 © Diodes Incorporated AH373 Document number: DS31173 Rev. 6 - 2 AH373 INTERNAL PULL-UP HALL EFFECT LATCH Electrical Characteristics (TA = 25 °C, Vdd = 12V) Symbol VOUT (SAT) Ioff Idd Rpu Characteristics Output Saturation Voltage Output Leakage Current Supply Current Internal Pull-up Resistor Conditions Iout = 20mA B < Brp OUT “OFF” — Min 7 Typ. 300