Cosemitech
Automotive Product Group
FEATURES and FUNCTIONAL DIAGRAM
Micro-power Omnipolar-Switch Hall Sensor
Multiple Sensitivity Options (BOP / BRP):
±33
/
±23
Gauss;
Push-pull output ability
Chopper stabilized design provides:
- Superior temperature stability
- Minimal switch point drift
- Enhanced immunity to physical stress
On board voltage regulator for 1.65V to 5.5V range
Push-pull Output (1 mA current ability)
Solid-state reliability
Wide Operating temperature range: -40 to 150
o
C
Small package sizes TO-92S, SOT-23
RoHS-compliant material meets directive 2011/65/EU
CH912/CH912L
This is advanced information on a new product now
in development or undergoing evaluation. Details are
subject to change without notice and Cosemitech
assumes no obligation for future manufacture of this
product. Contact Cosemitech for the latest status.
Preliminary Datasheet 1.4
PACKAGE
TO-92S
SOT-23-3L
APPLICATIONS
-Open and Close Detect for
Flip/Slide Cellular Phones；
-Smart Cover or Dock Detect
for Cellular Phones and
Tablet PCs;
-Cover or Display Switch in
Portable PCs (eg: Ultrabook);
Digital Still, Video Cameras
and Handheld Gaming
Consoles；
-Door, Lids and Tray Position
Switches；
-Level, Proximity and Position
Switches；
-Contact-Less Switches in
Home Appliances and
Industrial Applications.
DESCRIPTION
The CH912/CH912L is a high-sensitivity extremely temperature-stable micro-power Omnipolar Hall
effect switch IC with internal pull up and pull down capability. Designed for portable and battery powered
consumer equipment such as cellular phones and portable PCs to office equipment, home appliances and
industrial applications, the average supply current is only 1.62μA at 3,3V for CH912 and 0.92uA at 3.3V for
CH912L. To support potable equipment, the CH912/CH912L can operate over the supply range of 1.65V
to 5.5V and uses a hibernating clocking system to minimize the power consumption.
The device includes a clocking system, a Hall-voltage generator, a small-signal amplifier, a chopper
stabilization, two Schmitt trigger, and an output driver controller.
The output is activated with either a north or south pole of sufficient magnetic field strength. When the
magnetic flux density (B) perpendicular to the package is larger than operate point (Bop), the output will be
turned on (pulled low) and held until B is lower than release point (Brp).
Two package styles provide a magnetically optimized package for most applications, SOT-23 and TO-
92S. Each package type is lead (Pb) free (suffix, –T), with a 100% matte-tin-plated leadframe.
Page 1/9
Cosemitech
Automotive Product Group
CH912/ CH912L
. This is advanced information on a new product now
in development or undergoing evaluation. Details are
subject to change without notice and Cosemitech
assumes no obligation for future manufacture of this
product. Contact Cosemitech for the latest status.
Preliminary Datasheet 1.4
Table of Contents
1. Product Family Members ....................................................................................................... 3
2. Pin Definitions and Descriptions ............................................................................................ 3
3. Absolute Maximum Ratings ................................................................................................... 3
4. ESD Protections ..................................................................................................................... 4
5. Function Description .............................................................................................................. 4
6. Magnetic Activation ................................................................................................................ 4
7. Temperature Characterization ............................................................................................... 6
8. Parameters Specification ....................................................................................................... 6
9. Application infromation........................................................................................................... 7
10. Package Information .......................................................................................................... 10
Page 2/9
Cosemitech
Automotive Product Group
1. Product Family Members
Part Number
CH912SR
CH912TB
CH912LSR
CH912LTB
Marking ID
C912
C912
912L
912L
CH912/CH912L
This is advanced information on a new product now
in development or undergoing evaluation. Details are
subject to change without notice and Cosemitech assumes
no obligation for future manufacture of this product.
Contact Cosemitech for the latest status.
Preliminary Datasheet 1.4
Description
Micro-power Omnipolar-Switch, Hall-effect digital sensor IC, SOT-23-3L
package, tape and reel packing (3000 units per reel)
Micro-power Omnipolar-Switch, Hall-effect digital sensor IC, flat, TO-92S
package, bulk packing (1000 units per bag)
Micro-power Omnipolar-Switch, Hall-effect digital sensor IC, SOT-23-3L
package, tape and reel packing (3000 units per reel)
Micro-power Omnipolar-Switch, Hall-effect digital sensor IC, flat, TO-92S
package, bulk packing (1000 units per bag)
2. Pin Definitions and Descriptions
SOT-23-3L
(S)
1
2
3
TO-92S
(T)
1
3
2
Name
VDD
OUT
GND
Type
Supply
Output
Ground
Function
Supply Voltage pin
Push-pull Output pin
Ground pin
SOT-23-3L
TO-92S
SOT-23-3L
3. Absolute Maximum Ratings
Parameter
Supply Voltage
VDD Reverse Voltage VDD
Supply Current
Output Voltage
Output Current
Operating Ambient Temperature
Storage Temperature
Junction temperature
Magnetic Flux
TO-92S
Symbol
V
DD
V
RDD
I
DD
V
OUT
I
OUT
T
A
T
S
T
J
B
Min
-
-0.3
-
-0.3
-
-40
-50
-50
No Limit
Max
6
3
VDD+0.3
3
150
150
165
Units
V
V
mA
V
mA
°C
°C
°C
Gauss
Note: Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-
maximum- rated conditions for extended periods may affect device reliability.
Page 3/9
Cosemitech
Automotive Product Group
4. ESD Protections
Parameter
All pins
1)
All pins
2)
All pins
3)
1) HBM (Human Body Mode) according to AEC-Q100-002
2) MM (Machine Mode) according to AEC-Q100-003
3) CDM (charged device mode) according to AEC-Q100-011
CH912/ CH912L
. This is advanced information on a new product now
in development or undergoing evaluation. Details are
subject to change without notice and Cosemitech
assumes no obligation for future manufacture of this
product. Contact Cosemitech for the latest status.
Preliminary Datasheet 1.4
Value
+/-8000
+/-400
+/-1500
Unit
V
V
V
5. Function Description
The CH912/CH912L exhibits Micro-power digital Omnipolar switching characteristics.
Therefore, it requires only south poles or north poles to operate properly.
When the applied magnetic flux density exceeds the BOP threshold, the chip push-pull output
goes low. The output stays low until the field decreases to less than BRP, and then the output
goes to high.
A magnetic hysteresis BHYST keeps BOP and BRP separated by a minimal value. This
hysteresis prevents output oscillation near the switching point.
6. Magnetic Activation
7. Temperature Characteristics
Page 4/9
Cosemitech
Automotive Product Group
CH912/CH912L
This is advanced information on a new product now
in development or undergoing evaluation. Details are
subject to change without notice and Cosemitech assumes
no obligation for future manufacture of this product.
Contact Cosemitech for the latest status.
Preliminary Datasheet 1.4
8. Parameters Specification (VCC=3V supply, TA= -40 ºC to 150 ºC except
where otherwise specified.)
Symbol
V
CC
I
CC(awake)
I
CC(sleep)
Characteristic
Supply Voltage
CH912 Supply Current
CH912 Supply Current
Test Conditions
Operating, TJ < 165°C
Min.
1.8
–
–
–
–
Typ.
1.1
1.1
0.7
0.7
1.09
1.62
0.52
0.92
Max.
5.25
1.6
1.6
–
–
Unit
V
mA
mA
uA
uA
uA
uA
uA
uA
During awake period, TA =
CH912L Supply Current 25°C, VCC=3.3V
During sleep period, TA =
CH912L Supply Current 25°C, VCC=3.3V
CH912 Average supply TA = 25°C, VDD = 1.8V
current
TA = 25°C, VDD = 3.3V
CH912L Average supply TA = 25°C, VDD = 1.8V
current
TA = 25°C, VDD = 3.3V
Output low voltage(on)
Output high voltage(off)
CH912 Awake time
CH912L Awake time
CH912 Period
CH912L Period
Duty cycle CH912
Duty cycle CH912L
Chopping Frequency
Output Leakage Current
Operate point
Release point
Hysteresis
I
OUT
=1 mA
I
OUT
= -1mA
(note4)
(note4)
(note4)
(note4)
–
–
I
CC(avg)
V
OL
V
OH
T
awake
T
period
D.C.
f
C
I
OFF
Bop
Brp
Hys
1.
2.
–
V
CC
-
0.2
–
–
–
–
–
–
–
0.1
V
CC
-
0.1
40
40
50
200
0.08
0.02
500
–
±33
±23
10
0.2
–
60
60
75
280
–
–
–
1
±46
±36
–
V
V
us
us
ms
mS
%
%
kHz
μA
Gauss
Gauss
Gauss
VOUT = 5.5 V; Switch state
–
= Off
VDD = 1.8V to 5.25V
±20
TA = -40°C to 150°C
VDD = 1.8V to 5.25V
±10
TA = -40°C to 150°C
VDD = 1.8V to 5.25V
–
TA = -40°C to 150°C
3.
1G (gauss) = 0.1 mT (millitesla).
Measured from 10% to 90% of the steady state output.
When power is initially turned on, the operating VCC (1.6V to 5.5V) must be applied to guaranteed the
output sampling. The output state is valid after the second operating cycle (typical 100ms).
NOTICE: The magnetic field strength (Gauss) required to cause the switch to change state (operate and release)
will be as specified in the magnetic characteristics. To test the switch against the specified magnetic
Page 5/9
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