Applica on Note 109. Switch for Smart Locks. Relevant Products: Introduc on. Smart Lock System Diagram. Features and Benefits

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Norma Cummings
6 years ago
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Relevant Products: CT510 Series Digital Switch Introduc on New keyless, smart locks are emerging and replacing the tradi onal key deadbolt locks.

Manufacturers of the new smart locks use various methods to determine the dead bolt posi on and travel. As with any security-based product, reliability and repeatability are a stringent requirement.

Crocus Technology offers switches that when used with a complementary magnet will provide absolute posi on feedback.

1 Relevant Products: CT510 Series Digital Switch Introduc on New keyless, smart locks are emerging and replacing the tradi onal key deadbolt locks. With this new technology, the key is no longer used and the deadbolt posi on is now controlled by the smart lock itself and not the user with their key. Manufacturers of the new smart locks use various methods to determine the dead bolt posi on and travel. As with any security-based product, reliability and repeatability are a stringent requirement. The absolute posi on of the deadbolt needs to be known for the lock to accurately work with no issue. Hence, implementa on of a sensor system to determine absolute posi on is the best solu on. Crocus Technology offers switches that when used with a complementary magnet will provide absolute posi on feedback. This solu on will be plug n play and does not require the user to run through a complicated calibra on procedure for some smart locks. As the smart locks are ba er operated, the CT510 Series will provide extended life drawing less than 300 na of curent. Also of note, an addi onal switch can be integrated into the smart lock design to determine if the door is open or closed. This is an added feature that can alert the user of any security issues. Smart Lock System Diagram A simplified smart lock system is comprised of a power source, MCU, communica ons, keypad and sensors: Features and Benefits Accurate deadbolt posi on measurement Long ba ery life with less than 300 na PWR Transceiver (wi-fi or Bluetooth) Plug and play implementa on Digital output Cost compe ve User Interface MCU Motor Stable temperature performance Small form factor SOT-23 package Switch 1 Switch Crocus Technology Page 1

Deadbolt Implementa on The deadbolt posi on sensing can be implemented in two different

2) Sensing actual travel of the deadbolt as shown in Figure 2.

Deadbolt Travel Sensing Example Cylinder Rota on Sensing As the cylinder rota on is

the clockwise (CW) and counter-clockwise (CCW) posi on, the sensor will provide accurate

Deadbolt Posi on Sensing Similarly, the deadbolt posi on can be determined by moun ng a

2 Deadbolt Implementa on The deadbolt posi on sensing can be implemented in two different ways: 1) Sensing cylinder rota on posi on as shown in Figure 1. 2) Sensing actual travel of the deadbolt as shown in Figure 2. N S Magnet Sensor Sensor Switch Figure 1: Cylinder Rota on Sensing Example Figure 2: Deadbolt Travel Sensing Example Cylinder Rota on Sensing As the cylinder rota on is mechanically linked to the deadbolt posi on, knowing the cylinder loca on will correlate directly to the deadbolt posi on. As shown in Figure 2, by using two magnets to iden fy full travel of the cylinder in both the clockwise (CW) and counter-clockwise (CCW) posi on, the sensor will provide accurate informa on as to where the deadbolt posi on is, locked or unlocked posi on. Deadbolt Posi on Sensing Similarly, the deadbolt posi on can be determined by moun ng a magnet to the deadbolt itself. A sensor switch is located at both the locked and unlocked posi on. When the magnet aligns with either switch, the switch will turn on and communicate the deadbolt s posi on Crocus Technology Page 2

3 Door Security Feature The smart lock can also incorporate the CT510 Series switch to signal an open or closed door condi on. As shown in Figure 3, by aligning the switch and complementary magnet to the strike of the door, the sensor output will signal low for a closed door condi on or high for an open door condi on. It is important to note the polarity of the magnet and align the switch to the same polarity to ensure the magne c flux is sensed. For example, by ma ng the CT512 Switch with a ceramic magnet with surface magne c field strength B = 220 Gauss, the sensor will perform as illustrated in Figure 4 on the next page. In the closed door condi on, the switch output will be in the low state. As the door opens, the switch will remain low un l the Release Point, B RP, is reached at about 1.3 cm of travel. At the BRP, the output will switch to high signaling an open door condi on. The B RP = 15 Gauss for the CT512 switch. Conversely, as the door is closed, the sensor is in the high state un l the Opera ng Point, B OP, is reached at about the 1 cm point of travel from the closed door posi on. At the BOP, the output switches low and signals the close door condi on. The B OP = 60 Gauss for the CT512 switch. As shown in Figure 5, the applica on circuit is very user -friendly and can be easily integrated into the smart lock system design. Switch Magnet Figure 3: Door Sensing Example 2016 Crocus Technology Page 3

4 Magnet Manufacturer: Ningo Magne cs Factory, Ltd. Magnet Model #: Magnet Surface Field Strength: 220 Gauss Disc Dimensions: Diameter = 12mm Height = 5 mm V OUT HI Switch to Low Door Closed Door Closing Switch to High Door Open LO Door Opening Closed Door Posi on 1.0 cm (B OP) 1.3 cm (B RP) Figure 4: Magnet Distance Behavior Figure 5: CT512 Applica on Circuit 2016 Crocus Technology Page 4

5 Disclaimer: The contents of this document are provided in connec on with products of Crocus Technology (Crocus). CROCUS TECHNOLOGY MAKES NO REPRESENTATIONS OR WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH RESPECT TO THE ACCURA- CY OR COMPLETENESS OF THE CONTENTS HEREIN, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND RESERVES THE RIGHT TO MAKE CHANGES TO THE SPECIFI- CATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. Crocus reserves the right to discon nue or make changes to its products at any me without no ce. Crocus s products have not been designed, tested, or manufactured for use and should not be used in applica ons where the failure, malfunc on or inaccuracy of the Products carries a risk of death or serious bodily injury or damage to tangible property, including, but not limited to, life support systems, nuclear facili es, military, aircra naviga on or communica on, emergency systems, harsh environments, or other applica ons with a similar degree of poten al hazard. ATTRIBUTION 2015 Crocus Technology, Inc. and Crocus Technology SA. All rights reserved. Crocus Technology, Blossoming Future, MLU, and combina ons thereof are trademarks of Crocus Technology, Inc. and Crocus Technology SA Crocus Technology Page 5

ATD 3-Ton Jack Pack. Jack Size (L x W x H) Saddle Diameter Net Weight

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