Diodes AH175 User Manual
AH175
HALL EFFECT LATCH FOR HIGH TEMPERATURE
Description
AH175 is a single-digital-output Hall-Effect latch sensor 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, an open-collector output predriver. 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) 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 AH175 is available in SIP-3L and SC59 packages.
Features
• Bipolar Hall-Effect latch sensor
• 3.5V to 20V DC operating voltage
• Open collector pre-driver
• 25mA output sink current
• Built-in power reverse protection
• Operating Temperature: -40ºC~+150ºC
• 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.
Pin Assignments
(Top View)
SIP-3L
(Top View)
GND 2.
SC59
Applications
• 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
AH175
Document number: DS31043 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
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Pin Descriptions
Pin Name Pin # Description
Vcc 1 Positive Power Supply
GND 2 Ground
OUT 3 Output Stage
Functional Block Diagram
V
CC
1
AH175
HALL EFFECT LATCH FOR HIGH TEMPERATURE
REG.
3
OUT
AMP
2
GND
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
°C
°C
Recommended Operating Conditions
Symbol Characteristic Conditions Min Max Unit
VCC Supply Voltage Operating 3.5 20 V
TA
Notes: 2. The device PD and Safety Operation Area should not be exceeded.
AH175
Document number: DS31043 Rev. 10 - 2
Operating Ambient Temperature
(Note 2)
Operating -40 150
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°C
July 2010
AH175
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
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 30 80 120 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 10 80 160 Gauss
Notes: 3. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
= 25°C)
A
V
= 12V, OUT ”ON”
CC
I
= 10mA
O
= 25°C, Vcc = 12V, unless otherwise specified, Note 3)
A
- 300 400 mV
(1mT = 10 Gauss)
Operating Characteristics
S
Marking side
N
(SC59)
S
N
(SIP-3L)
Marking side
V
out
V
cc
High
Voltage)
(Output
V
SAT
rp
B
0
(Magnetic Flux Density)
d
V
hy
B
Low
op
B
AH175
Document number: DS31043 Rev. 10 - 2
3 of 9
www.diodes.com
July 2010
© Diodes Incorporated
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