Diodes AH173 User Manual
AH173
INTERNAL PULL-UP HALL EFFECT LATCH FOR HIGH
TEMPERATURE
Description
AH173 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, a comparator to
provide switching hysteresis for noise rejection, and an
output driver with a pull-up resistor (Rpu). 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 AH173 is available in SIP-3L and SC59 packages.
Pin Assignments
(Top View)
SIP-3L
(Top View)
GND 2.
SC59
Applications
Features
• Bipolar Hall-Effect latch sensor
• 3V to 20V DC operating voltage
• Built-in pull-up resistor
• 25mA output sink current
• Operating temperature: -40°C to +125°C
• SIP-3L and SC59 packages
(SC59 is commonly known as SOT23 in Asia)
• Green Molding Compound (No Br, Sb) (Note 1)
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.
• Rotor Position Sensing
• Current Switch
• Encoder
• RPM Detection
3.
2.
1.
3. OUT
1. Vcc
OUT
GND
Vcc
Typical Application Circuit
IA
IB
Driver
&
IC
Ia
Ib
Ic
Control Logic
HA
HB
HC
Hall Motor Driver
AH173
Document number: DS31044 Rev. 10 - 2
M
RPM sensing
3 Phase Hall Motor
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Digital Hall Effect Sensor
M: Three Phase Hall Motor
July 2010
© Diodes Incorporated
INTERNAL PULL-UP HALL EFFECT LATCH FOR HIGH
Pin Descriptions
Pin Name Pin # Description
Vcc 1 Positive Power Supply
GND 2 Ground
OUT 3 Output Stage
Functional Block Diagram
V
CC
1
AH173
TEMPERATURE
REG.
AMP
Absolute Maximum Ratings (T
Symbol Characteristics Values Unit
VCC Supply Voltage 20 V
V
(off) Output “Off” Voltage 20 V
OUT
IO (sink) Output “On” Current 25 mA
Ts Storage Temperature Range -65~+150
TJ Maximum Junction Temperature +150
PD Power Dissipation
= 25°C)
A
SIP-3L 550 mW
SC59 230 mW
Rpu
3
2
OUT
GND
°C
°C
Recommended Operating Conditions
Symbol Characteristic Conditions Min Max Unit
VCC Supply Voltage Operating 3 20 V
TA Operating Ambient Temperature Operating -40 125
AH173
Document number: DS31044 Rev. 10 - 2
2 of 9
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© Diodes Incorporated
°C
July 2010
AH173
INTERNAL PULL-UP HALL EFFECT LATCH FOR HIGH
TEMPERATURE
Electrical Characteristics (T
Symbol Characteristics Conditions Min Typ. Max Unit
V
OUT (SAT)
Output Saturation Voltage
ICC Supply Current VCC = 12V, OUT ”OFF” - 3.5 6 mA
Rpu Internal Pull-up Resistor 7 10 13
Vd Dropout Voltage
Magnetic Characteristics (T
A grade
Symbol Parameter Min Typ. Max Unit
Bops(south pole to brand side) Operation Point 15 - 60 Gauss
Brps(south pole to brand side) Release Point -60 - -15 Gauss
Bhy(|Bopx|-|Brpx|) Hysteresis - 80 - Gauss
B grade
Symbol Parameter Min Typ. Max Unit
Bops(south pole to brand side) Operation Point 5 - 80 Gauss
Brps(south pole to brand side) Release Point -80 - -5 Gauss
Bhy(|Bopx|-|Brpx|) Hysteresis - 80 - Gauss
Notes: 2. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
= 25°C)
A
V
= 12V, OUT ”ON”
CC
I
= 10mA
O
= V
CC
- VCe
V
d
= 25°C, Vcc = 12V, unless otherwise specified, Note 2)
A
- 300 400 mV
- - 0.3 V
(1mT = 10 Gauss)
KΩ
Operating Characteristics
S
Marking Side
N
(SC59)
AH173
Document number: DS31044 Rev. 10 - 2
S
N
(SIP-3L)
Marking Side
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V
out
V
cc
High
Voltage)
B
(Output
V
SAT
rp
B
0
(Magnetic Flux Density)
V
d
hy
Low
op
B
July 2010
© Diodes Incorporated
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