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OCH178
Micro Power Omnipolar Hall-effect Sensor Switch
General Description
The OCH178 Omnipolar Hall-effect Sensor IC is
fabricated from mixed signal CMOS technology. It is
comprised of two Hall plates and a CMOS output
driver, mainly designed for battery-operation,
hand-held equipment (such as Cellular and Cordless
Phone, PDA). The total power consumption in normal
operation is typically 24μW with a 3V power source.
Either north or south poles of sufficient strength will
turn the output on. The output will be turned off under
no magnetic field. While the magnetic flux density (B)
is larger than operating point (BOP), the output will be
turned on (low), the output is held until B is lower than
release point (BRP), and then turned off.
The OCH178 is available in many flexible
packaging options, such as DFN1616-6L and
DFN1616-3L. Operating temperature range of the
OCH178 is from -40°C to 85°C.
To minimize the BOM cost, capacitors of the
MLCC type are supported, and only one external
component are needed to complete the application
circuit.
Features
Micro power consumption ideal for
battery-powered applications
Omnipolar (operation with magnetic field of either
north or south pole), easy to use as output
switches with both North and South pole
Input Voltage Range: 2.4V to 5.5V
Very High Sensitivity Hall Sensor
Chopper stabilized amplifier stage
Good RF noise immunity
DFN1616-6L and DFN1616-3L package
ESD (HBM) 4KV
Not need the push-high resistance
Applications
Cover switch in clam-shell cellular phones
Cover switch in Notebook PC/PDA
Contact-less switch in consumer products
Solid State Switch
Handheld Wireless Handset Awake Switch
Lid close sensor for battery-powered devise
Magnet proximity sensor for reed switch
replacement in low duty cycle applications
Pin Configuration
(1) DFN1616_6L (Top View)
(2) DFN1616_3L (Top View)
Note: NC is “No Connection” which is recommended to be tied to ground.
Pin
Name
VDD
GND
OUTPUT
N.C
Pin No.
DFN1616-6L DFN1616-3L
42
21
63
1,3,5
-
Pin Function
Power Supply Input
Ground
Output Pin
Not Connected
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Ver. 1.3, Feb .27, 2018
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Typical Application Circuit
OCH178
Micro Power Omnipolar Hall-effect Sensor Switch
Note: C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF~100nF.
Ordering Information
OCH178XXX
Package
V: DFN1616-6L
V3DFN1616-3L
Packing
Blank: Tube or Bulk
A: Tape & Reel
Temperature Grade
D: -40°C~85°C
Part Number Package Type
OCH178VAD DFN1616-6L
OCH178V3AD DFN1616-3L
Package Qty
7-in reel
3000pcs/reel
7-in reel
3000pcs/reel
Brp
(Gauss)
±10 ~ ±50
Bop
(Gauss)
±20 ~ ±60
Temperature
-4085
±10 ~ ±50 ±20 ~ ±60 -4085
Eco
Plan
Green
Green
Lead/Ball
Finish
Cu
NIPDAU
Cu
NIPDAU
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Ver. 1.3, Feb .27, 2018
源于灿瑞 磁传天下