Diodes AH373 User Manual
A
H373
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
-40C 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)
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.
Pin Assignments
(TOP View)
SC59 and SOT23
(TOP View)
SIP-3L
Applications
Rotor Position Sensing for Motor Commutation
Encoder
Speed Measurement – RPM Monitor
Contact-less Current Switch
3.
OUT
GND
2.
V
1.
DD
Typical Application Circuits
Driver
&
Control Logic
Hall Motor Driver
AH373
Document number: Draft DS31173 Rev. 11 - 2
HA
HB
HC
IA
IB
IC
Ia
Ib
Ic
RPM sensing
3 Phase Hall Motor
M
Digital Hall Effect Sensor
M: Three Phase Hall Motor
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Typical Application Circuits (cont.)
Typical AH373 Circuit
Note: 4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical
H373
Pin Descriptions
Package: SC59, SOT23 and SIP-3L
Pin Number Pin Name Function
Functional Block Diagram
V
DD
1
Regulator
1
2 GND Ground
3 OUTPUT Output
V
DD
Power Supply Input
Hall
plate
Amp
Rpu
OUTPUT
3
2
2
GND
AH373
Document number: Draft DS31173 Rev. 11 - 2
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H373
Absolute Maximum Ratings (Note 5) @T
Symbol Characteristics Values Unit
VDD
V
(Off)
OUT
IO (sink)
B Magnetic Flux Density Unlimited
PD
TS
TJ
Notes: 5. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
6. The absolute maximum V
Supply Voltage (Note 6) 28 V
Output “Off” Voltage 28 V
Output “On” current (sink) 25 mA
Package Power Dissipation
Storage Temperature Range -65 to +150 °C
Maximum Junction Temperature +150 °C
of 28V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate
the device at the absolute maximum rated conditions for any period of time.
DD
Recommended Operating Conditions (@T
Symbol Characteristic Conditions Rating Unit
VDD
TA
Note: 7. The output of IC will be switched after the supply voltage is over 2.2V, but the magnetic characteristics will not be normal until the supply is over 2.5V.
Electrical Characteristics (@T
Symbol Characteristic Conditions Min Typ Max Unit
V
OUT
IDD
I
OFF
Rpu Internal Pull-up Resistor — 7 10 13 kΩ
AH373
Document number: Draft DS31173 Rev. 11 - 2
Supply Voltage (Note 7) Operating 2.2 to 20 V
Operating Temperature Range Operating -40 to +125 °C
= +25°C, VDD = 12V, unless otherwise specified.)
A
Output On Voltage
Supply Current B < Brp — 2 4 mA
Output Leakage Current Output off — < 0.1 10 µA
= +25°C, unless otherwise specified.)
A
SIP-3L 550 mW
SC59 and SOT23 230 mW
= +25°C, unless otherwise specified.)
A
I
= 20mA
OUT
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— 300 400 mV
September 2013
© Diodes Incorporated
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H373
Magnetic Characteristics (Note 8) (@T
Symbol Characteristic Min Typ Max Unit
Bop (South pole to part marking side for SIP-3L and SOT23;
North pole to part marking side for SC59 )
Brp (South pole to part marking side for SIP-3L and SOT23;
North pole to part marking side for SC59 )
Bhy (|Bopx|-|Brpx|) Hysteresis — 60 —
Note: 8. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
= +25°C, VDD = 2.5V to 20V, unless otherwise specified.)
A
Operation Point 5 30 60
Release Point -60 -30 -5
(1mT=10 Gauss)
( Output Voltage )
Gauss
AH373
Document number: Draft DS31173 Rev. 11 - 2
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© Diodes Incorporated
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