Diodes AH373 - Manual

AH373
Document number: Draft DS31173 Rev. 11 - 2
1 of 12
www.diodes.com
September 2013
© Diodes Incorporated
AH373
INTERNAL PULL-UP HALL EFFECT LATCH
Description
AH373 is a single-digital-output Hall-Effect latch sensor with internal
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
compensated supply voltage for internal circuits and allows a wide
operating supply range.
When the magnetic flux density (B) perpendicular to the package 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, SC59 and SOT23 packages.
Features
 Bipolar Hall Effect Latch Operation
 2.2V to 20V Operating Range
 Single Output with Built-in Pull-up Resistor
 25mA output Sink Capability
 -40C to +125°C 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)
Pin Assignments
(TOP View)
SC59 and SOT23
(TOP View)
1. V
DD
2. GND
3. OUT
SIP-3L
Applications
 Rotor Position Sensing for Motor Commutation
 Encoder

Speed Measurement – RPM Monitor
 Contact-less Current Switch
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Application Circuits
M
Driver
&
Control Logic
I a
I b
I c
I
A
I
C
I
B
H
B
H
A
H
C
M: Three Phase Hall Motor
Digital Hall Effect Sensor
Hall Motor Driver
RPM sensing
3 Phase Hall Motor