ADLxxx Nanopower Digital Switches
ADLxxx Nanopower Digital Switches
Functional Diagrams
Features
2.4 V − 3.6 V operating voltage
Continuously operating or duty-cycled versions
Power as low as 150 nW at 2.4 V
Operate points as low as 20 Oe
Precise detection of low magnetic fields
Ultraminiature 1.1 x 1.1 mm package
•
•
•
•
•
•
VDD
Out
GMR
Sensor
Element
Comparator
Applications
• Portable instruments
• Utility meters
• Lithium cell powered applications
GND
ADL9xx
(continuous duty)
VDD
Oscillator
and Timing
Out
GMR
Sensor
Element
Comparator
Latch
GND
ADL0xx
(duty-cycled)
Idealized Magnetic Response
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Description
ADLxxx-Series sensors are Giant Magnetoresistive (GMR)
Digital Switch devices designed to operate from
3.3-volt power supplies or single lithium cells with
extremely supply low currents. The devices are
manufactured with NVE’s patented spintronic GMR
technology and low-power CMOS circuitry for unmatched
miniaturization, sensitivity, precision, and low power.
The output is configured as a magnetic “switch” where the
output turns on when the magnetic field is applied, and turns
off when the field is removed. Versions are available that are
either continuous duty or internally duty cycled operation to
further reduce power consumption. An integrated latch
ensures the output is available continuously in duty-cycled
versions.
The applied field can be of either polarity, and the operate
point is extremely stable over supply voltage and
temperature. The output is current-sinking, and can sink up
to 100 microamps.
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
Absolute Maximum Ratings
Parameter
Supply voltage
Output voltage
Output current
Storage temperature
Junction temperature
Applied magnetic field
Min.
−65
Max.
5.5
5.5
200
135
135
Unlimited
Units
Volts
Volts
μA
°C
°C
Operating Specifications
Tmin to Tmax; 2.4 V < VDD < 3.6 V unless otherwise stated.
Parameter
Symbol
Min.
Typ.
Max.
Supply voltage
VDD
2.4
3
3.6
Operating temperature
TMIN; TMAX
−40
125
Magnetic operate point
HOP
ADLx21
15
20
25
ADLx24
21
28
34
Operate/release differential
HOP−HREL
2
14
Quiescent current
ADL1xx
0.06
0.12
ADL0xx
0.13
0.26
IDDQ
ADL9xx
35
50
ADL1xx
0.25
0.38
ADL0xx
0.35
0.65
ADL9xx
85
120
ADL0xx / ADL1xx peak supply current
IDD-PK
60
100
Output drive current
IOL-ON
100
Output low voltage
Output leakage current
Update frequency
ADL1xx
ADL0xx
Frequency response (ADL9xx)
Units
Volts
°C
Oe
Oe
VDD = 2.4V
μA
VDD = 3.6V
μA
μA
VOL
0.2
V
IOL-OFF
0.005
μA
10
20
30
55
100
Test Condition
VDD = 3V
VDD = 3.6V;
IOL-ON = 100 μA
Hz
kHz
2
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
Operation
Direction of Magnetic Sensitivity
As the field varies in intensity, the digital output will turn on and off. Unlike Hall effect or other sensors, the direction of
sensitivity is in the plane of the package. The diagrams below show two permanent magnet orientations that will activate the
sensor in the direction of sensitivity:
Figure 1. Direction of magnetic sensitivity.
ADL-Series sensors are “omnipolar,” meaning the outputs turn ON when a magnetic field of either magnetic polarity is applied.
External Pull-Up Resistor
Outputs are logic low when the sensor is activated. The outputs are open-drain, and should have an external pull-up resistor. For
microcontroller interfaces, the microcontroller’s input pull-up resistors can be activated.
Typical Operation
Figure 2 shows typical ADL-Series sensor orientation. The arrow on the circuit board shows the direction of magnetic sensitivity:
ADL-Series Sensor
Figure 2. Typical operation; the circuit board arrow shows direction of sensitivity.
Typical magnetic operate and release distances for an inexpensive 4 mm diameter by 6 mm thick ceramic disk magnet, are
illustrated in the following table:
Part
ADLx21-14E
ADLx24-14E
Operate
Distance
(typ.)
10 mm
9 mm
Operate
Point (typ.)
20 Oe
28 Oe
Release
Distance
(typ.)
12 mm
11 mm
Larger and stronger magnets allow farther operate and release distances. For more calculations, use our digital sensor switching
versus distance Web application at: www.nve.com/spec/calculators.php.
3
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
Illustrative Application Circuits
Direct-Drive LED Indicator
Although ADLxxx-14E series sensors are not capable of driving legacy LEDs, high-efficiency LEDs such as the APT3216LSECK
are visible with the 100µA drive current provided by the sensors without an external driver.
This circuit illustrates a sensor powered by a single lithium button cell with a surface-mount indicator LED:
APT3216
LSECK
2
10K
3
3V
BR1225
4
ADL9xx-14E
Figure 3. Typical ADLxxx-14E application.
Two-Wire Sensor Interface Using a Voltage Regulator
ADL-Series sensors are perfect for two-wire applications, because their low supply voltage and low quiescent current provide
plenty of design margin. Two-wire interfaces need to operate over a wide power supply range. With the sensor off, the circuit must
draw a minimal residual current, typically less than 1.5 milliamps. With the sensor on, the circuit must provide enough current to
drive a significant load such as a motor or solenoid:
ADL924-14E
VDD
3.3 V
Out
a
DC
001-10
200K
b
NC7S
14M5X
IRLML
6346
LOAD
80 mA
max.
300
V+
5-30 V
IRLML
5103
MMSZ
4685
(3.6 V)
V-
Gnd
a. GMR Bridge b. Comparator
Figure 4. Typical two-wire circuit.
In this circuit, when a magnetic field is applied to the sensor, the MOSFETs turn on, turning on the LED and powering the load.
This circuit uses an NVE DC001-10 regulator, which provides better regulation and operating latitude over the input voltage range
than a Zener diode.
With no magnetic field and the sensor off, the residual current of the circuit is dominated by the DC001 regulator’s quiescent
current, which is less than one milliamp and relatively constant over input voltage. The Zener diode provides enough voltage to
power the circuitry when the load is powered.
4
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
Typical Performance
Average current increases with supply voltage but remains extremely low. The magnetic operate and release points are stable over
temperature and supply voltage. Update frequency increases somewhat with supply voltage.
40
Operate Point
30
300
Applied Field (Oe)
Supply Current (nA)
350
250
200
150
Release Point
20
10
0
-10
-20
Release Point
-30
100
2.4
2.6
2.8
3
3.2
Supply Voltage
3.4
Operate Point
-40
3.6
-40
-25
-10
5
20
35
50
65
80
95
110 125
Temperature (ºC)
Figure 5. Typical supply current
vs. supply voltage (ADL0xx; 25°C).
Figure 6. Typical magnetic operate and release
points vs. temperature (ADLx24; Vdd=3V).
33
60
50
Magnetic Field (Oe)
Update Frequency (Hz)
32
40
30
31
30
29
28
27
26
20
2.4
2.6
2.8
3
3.2
Supply Voltage
3.4
3.6
Figure 7. Typical update frequency
vs. supply voltage (ADL0xx; 25°C).
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
25
2.4
2.6
2.8
3
3.2
Supply Voltage
3.4
Figure 8. Typical magnetic operate point
vs. supply voltage (ADLx24; 25°C).
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
3.6
ADLxxx Nanopower Digital Switches
Part Numbering
The following example shows the ADL-Series part-numbering system:
ADL 0 21 - 14E
Base Part
ADL = 2.4 – 3.6 V
Nanopower digital switch
Duty Cycling
0 = 55 Hz typical
1 = 30 Hz typical
9 = Continuous duty
Typ. Magnetic
Operate Point
21 = 20 Oe
24 = 28 Oe
Package Type
14E = 1.1 mm x 1.1 mm
ULLGA (RoHS)
Available Parts
Available
Part
ADL021-14E
ADL024-14E
ADL121-14E
ADL124-14E
ADL921-14E
ADL924-14E
Duty
Cycled?
Y
Y
Y
Y
N
N
Update
Freq. (typ.)
55 Hz
55 Hz
30 Hz
30 Hz
Continuous
Continuous
Operate
Point (typ.)
20 Oe
28 Oe
20 Oe
28 Oe
20 Oe
28 Oe
Package
ULLGA
ULLGA
ULLGA
ULLGA
ULLGA
ULLGA
Package
Marking
V
C
B
D
M
N
6
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
C
VDD
OUT
R2 R1 LED
GND
Evaluation Kits
NVE offers two ADL-Series Demonstration Boards, one with a battery and one without. These inexpensive evaluation kits include
demo boards with the ultraminiature, ultralow-power ADL021 magnetic switch included. An LED shows the sensor output. A
miniature bar magnet is included so you can see for yourself how these remarkable sensors work. These miniature evaluation
boards are just 1.57 by 0.25 inches (40 x 6 mm). Images are actual size:
VDD
OUT
R2 R1 LED
GND
AG040-06
www.nve.com
AG040-06
www.nve.com
AG040C: ADL021 Externally-Powered Evaluation Board
This board has a digital output, and can be powered from a 3.3-volt nominal supply. An LED
shows the output.
AG040B: ADL021 Battery-Powered Demonstration Board
This board is powered by a three-volt lithium coin cell (included), and the sensor quiescent power
consumption is so low that the battery will last indefinitely.
Bare Circuit Boards
NVE offers two bare circuit boards designed for easy connections to ULLGA sensors. Note that since these boards use very small
sensors, they require reflow or hot-air soldering techniques. Images are actual size:
OUT
VCC
R
C1
www.nve.com
GND
AG904-06: ULLGA General-Purpose PCB
1.2 x 0.25 inch (30 x 6 mm) PCB for demonstrating 1.1 x 1.1 mm ULLGA4 sensors (-14E sensor
suffix).
AG039-06
AG039-06: ULLGA Digital Sensor Demonstration Bare Board
A 1.57 x 0.25 inch PCB for demonstrating ADL-Series sensors (sensors sold separately). In
addition to space for the sensor, the boards have locations for 0402-size pull-up resistors and
bypass capacitors.
7
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
1.1 mm x 1.1 mm ULLGA Package (-14E suffix)
1.05
1.15
0.30
0.40
Bottom View
0.35
1.10
0.65
0.30
3
4
2
1
0.40
0.20
0.60
0.10
Side View
1.05
1.15
Top View
0.05
RoHS
Direction of Sensitivity
Pin 1
Pin 2
Pin 3
Pin 4
COMPLIANT
Dimensions in mm; ±0.10 mm
unless otherwise noted.
No Connect
VDD
Out
Ground
Soldering profile per JEDEC J-STD-020C, MSL 1.
These products have been tested for electrostatic sensitivity to the limits stated in the specifications. However, NVE
recommends that all integrated circuits be handled with appropriate care to avoid damage. Damage caused by
inappropriate handling or storage could range from performance degradation to complete failure.
8
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
Revision History
SB-00-017
November 2017
Change
• Added “Typical Operation” section and image (p. 3).
• Added Evaluation Kits and bare boards (p. 7).
SB-00-017
October 2017
Change
• Revised package outline dimensions.
SB-00-017
May 2017
Changes
• Added application circuit.
• Revised quiescent current specifications.
• Added selector guide.
• Obsoleted ADLx22 versions/
• Cosmetic changes.
SB-00-017
December 2008
Change
• Initial Release.
9
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
Datasheet Limitations
The information and data provided in datasheets shall define the specification of the product as agreed between NVE and its customer, unless NVE and
customer have explicitly agreed otherwise in writing. All specifications are based on NVE test protocols. In no event however, shall an agreement be
valid in which the NVE product is deemed to offer functions and qualities beyond those described in the datasheet.
Limited Warranty and Liability
Information in this document is believed to be accurate and reliable. However, NVE does not give any representations or warranties, expressed or
implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information.
In no event shall NVE be liable for any indirect, incidental, punitive, special or consequential damages (including, without limitation, lost profits, lost
savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on
tort (including negligence), warranty, breach of contract or any other legal theory.
Right to Make Changes
NVE reserves the right to make changes to information published in this document including, without limitation, specifications and product descriptions
at any time and without notice. This document supersedes and replaces all information supplied prior to its publication.
Use in Life-Critical or Safety-Critical Applications
Unless NVE and a customer explicitly agree otherwise in writing, NVE products are not designed, authorized or warranted to be suitable for use in life
support, life-critical or safety-critical devices or equipment. NVE accepts no liability for inclusion or use of NVE products in such applications and such
inclusion or use is at the customer’s own risk. Should the customer use NVE products for such application whether authorized by NVE or not, the
customer shall indemnify and hold NVE harmless against all claims and damages.
Applications
Applications described in this datasheet are illustrative only. NVE makes no representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and operation of their applications and products using NVE products, and NVE accepts no liability for any
assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NVE product is suitable and fit for
the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customers. Customers should
provide appropriate design and operating safeguards to minimize the risks associated with their applications and products.
NVE does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s
applications or products, or the application or use by customer’s third party customers. The customer is responsible for all necessary testing for the
customer’s applications and products using NVE products in order to avoid a default of the applications and the products or of the application or use by
customer’s third party customers. NVE accepts no liability in this respect.
Limiting Values
Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the
device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the recommended
operating conditions of the datasheet is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the
quality and reliability of the device.
Terms and Conditions of Sale
In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NVE hereby expressly objects to
applying the customer’s general terms and conditions with regard to the purchase of NVE products by customer.
No Offer to Sell or License
Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication
of any license under any copyrights, patents or other industrial or intellectual property rights.
Export Control
This document as well as the items described herein may be subject to export control regulations. Export might require a prior authorization from national authorities.
Automotive Qualified Products
Unless the datasheet expressly states that a specific NVE product is automotive qualified, the product is not suitable for automotive use. It is neither
qualified nor tested in accordance with automotive testing or application requirements. NVE accepts no liability for inclusion or use of non-automotive
qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall
use the product without NVE’s warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the
product for automotive applications beyond NVE’s specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies
NVE for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NVE’s
standard warranty and NVE’s product specifications.
10
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation
ADLxxx Nanopower Digital Switches
An ISO 9001 Certified Company
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
www.nve.com
e-mail: sensor-info@nve.com
©NVE Corporation
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
SB-00-017
rev. Nov. 2017
11
NVE Corporation
11409 Valley View Road, Eden Prairie, MN 55344-3617
Phone: (952) 829-9217
www.nve.com
©NVE Corporation