Cosemitech
CH912/CH912L
Automotive Product Group
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 2.0
FEATURES and FUNCTIONAL DIAGRAM
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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 1.8V to 5.25V range
Push-pull Output (1 mA current ability)
Solid-state reliability
Wide Operating temperature range: -40 to 150 oC
Small package sizes TO-92S, SOT-23
RoHS-compliant material meets directive 2011/65/EU
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 1.8V 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 TO92S. Each package type is lead (Pb) free (suffix, –T), with a 100% matte-tin-plated leadframe.
Page 1/9
Cosemitech
CH912/CH912L
Automotive Product Group
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 2.0
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
CH912/CH912L
Automotive Product Group
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 2.0
1. Product Family Members
Part Number
Marking ID
CH912SR
C912
CH912TB
C912
CH912LSR
912L
CH912LTB
912L
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
TO-92S
(T)
1
2
3
Name
Type
VDD
Supply
Supply Voltage pin
3
OUT
Output
Push-pull Output pin
2
GND
Ground
Ground pin
SOT-23-3L
SOT-23-3L
Function
TO-92S
TO-92S
3. Absolute Maximum Ratings
Parameter
Supply Voltage
VDD Reverse Voltage VDD
Supply Current
Symbol
VDD
VRDD
IDD
Min
-0.3
-
Max
6
3
Units
V
V
mA
Output Voltage
VOUT
-0.3
VDD+0.3
V
Output Current
IOUT
-
3
mA
Operating Ambient Temperature
TA
-40
150
°C
Storage Temperature
TS
-50
150
°C
Junction temperature
TJ
-50
165
°C
Magnetic Flux
B
No Limit
Gauss
Note: Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolutemaximum- rated conditions for extended periods may affect device reliability.
Page 3/9
Cosemitech
CH912/CH912L
Automotive Product Group
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 2.0
4. ESD Protections
Parameter
Value
Unit
All pins 1)
+/-8000
V
All pins 2)
+/-400
V
All pins 3)
+/-1500
V
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
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
CH912/CH912L
Automotive Product Group
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 2.0
8. Parameters Specification (VCC=3V supply, TA= -40 ºC to 150 ºC except
where otherwise specified.)
Symbol
VCC
ICC(awake)
ICC(sleep)
ICC(avg)
Operating, TJ < 165°C
Min.
Typ.
1.8
Max.
Unit
5.25
V
During awake period, TA =
CH912L Supply Current 25°C, VCC=3.3V
–
1.1
1.6
mA
–
1.1
1.6
mA
CH912 Supply Current
–
0.7
–
uA
–
0.7
–
uA
CH912 Supply Current
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
1.09
uA
1.62
uA
CH912L Average supply TA = 25°C, VDD = 1.8V
current
TA = 25°C, VDD = 3.3V
0.52
uA
0.92
uA
Output low voltage(on)
IOUT =1 mA
–
0.1
0.2
V
VOH
Output high voltage(off)
IOUT = -1mA
VCC0.2
VCC0.1
–
V
CH912 Awake time
(note3)
–
40
75
us
CH912L Awake time
(note3)
–
40
75
us
CH912 Period
(note3)
–
50
100
ms
CH912L Period
(note3)
–
200
350
mS
Duty cycle CH912
–
–
0.08
–
%
Duty cycle CH912L
–
–
0.02
–
%
–
500
–
kHz
–
1
μA
±33
±75
Gauss
±23
±65
Gauss
10
–
Gauss
Tperiod
D.C.
fC
3.
Supply Voltage
Test Conditions
VOL
Tawake
1.
2.
Characteristic
Chopping Frequency
IOFF
Output Leakage Current
Bop
Operate point
Brp
Release point
Hys
Hysteresis
VOUT = 5.25V; Switch state
–
= Off
VDD = 1.8V to 5.25V
±20
TA = 25°C
VDD = 1.8V to 5.25V
±10
TA = 25°C
VDD = 1.8V to 5.25V
–
TA = 25°C
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 (1.8V 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
characteristics, the switch must be placed in a uniform magnetic field.
Page 5/9
Cosemitech
CH912/CH912L
Automotive Product Group
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 2.0
9. Application Information
9.1 Typical Application
It is recommended that an external capacitor CIN is connected to the supply. This can reduce
the noise injected into the device. Normal 0.1uF is suggested.
Typical Application Circuit
9.2 Device Output
If the device is powered on with a magnetic field strength between BRP and BOP, then the
device output is indeterminate and can either be high or Low. If the field strength is greater than
BOP, then the output is pulled low. If the field strength is less than BRP, then the output is pulled
high.
Page 6/9
Cosemitech
CH912/CH912L
Automotive Product Group
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 2.0
10. Package Information:
Package Designator
TO-92S
Symbol
A
b
b1
c
D
E
E1
e
e1
L
L1
θ1
θ2
θ3
θ4
Min.
2.9
0.35
0.36
3.9
1.42
13.5
Dimensions in Millimeters
Typ.
Max.
3
3.1
0.39
0.56
0.44
0.38
0.51
4
4.1
1.52
1.62
0.75
1.27
2.54
14.5
15.5
1.6
6°
3°
45°
3°
Page 7/9
Cosemitech
CH912/CH912L
Automotive Product Group
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 2.0
Page 8/9
Cosemitech
CH912/CH912L
Automotive Product Group
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 2.0
Information furnished is believed to be accurate and reliable. However, Cosemitech assumes no
responsibility for the consequences of use of such information nor for any infringement of patents or
other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Cosemitech. Specification mentioned in this publication
are subject to change without notice. This publication supersedes and replaces all information
previously supplied. Cosemitech products are not authorized for use as critical components in life
support devices or systems without express written approval of Cosemitech.
The Cosemitech logo is a registered trademark of Cosemitech
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