AH373A-WA

AH373 Internal Pull-up Hall Effect Latch Features - Bipolar Hall effect latch sensor - 2.2V to 20V DC operation voltage - Built-in pull-up resistor - 25mA output sink current - Operating temperature: −40°C ~ +125°C - Package: SIP3, SOT23 General Description AH373 is a single-digital-output Hall-effect 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 (Rpu). An internal bandgap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range. While the magnetic flux density (B) is larger than operate point (Bop), the OUT pin turns on (low). If B moves toward release point (Brp), the OUT pin is latched “on” state prior to B < Brp. When B < Brp, the OUT pin go into “ off ” state. Applications - Rotor position sensing - Current switch - Encoder - RPM detection Pin Assignment Pin Descriptions Name Description Positive Power Supply Ground Output Pin 373 2 373 1 3 VCC (Top view) 1 : VCC 2 : GND 3 : OUT GND OUT ( SOT23 package) 123 (SIP3 package) Ordering Information AH373 X - X X X Wafer Body Blank or A~Z : if necessary to specify Package P: SIP-3L W: SOT23-3L Lead L : Lead Free Blank: Normal Packing Blank : Tube or Bulk A : Tape & Reel This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev. 0.0 Jan 31, 2005 1/6 AH373 Internal Pull-up Hall Effect Latch Block Diagram VCC 1 Regulator Hall plate Rpu 3 2 OUT Amp 2 GND Functional Application Circuit IA IB M Digital Hall Effect Sensor M: Three Phase Hall Motor Driver & Control Logic IC Ia Ib Ic RPM sensing HA HB HC Hall Motor Driver 3 Phase Hall Motor Absolute Maximum Ratings ( at Ta= 25°C ) Characteristics Supply voltage Output “off ” voltage Output “on” current Operating temperature range Storage temperature range Power dissipation SIP SOT23 Symbol VCC Vout (off) Io (sink) Top Tstg PD Values 20 28 25 -40~+125 -65~+150 550 230 Unit V V mA °C °C mW mW Anachip Corp. www.anachip.com.tw 2/6 Rev 0.0 Jan 31, 2005 AH373 Internal Pull-up Hall Effect Latch Electrical Characteristics ( Ta= 25°C, Vcc=12V ) Characteristics Supply voltage Output saturation voltage Output Leakage Current Supply current Internal pull-up resistor Symbol Vcc Vout(sat) Ioff Icc Rpu Conditions — Iout =20mA B < Brp OUT ”OFF” — Min. 2.2* 7 Typ. 300