Patent Publication Number: US-11650252-B2

Title: Electronic device with solid state switch monitoring

Description:
PRIORITY APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 16/452,053, filed Jun. 25, 2019, the content of which is incorporated herein by reference. 
    
    
     1. Technical Field 
     The present disclosure relates generally to electronic devices having user input controls and in particular to electronic devices that use solid state user input keys. 
     2. Description of the Related Art 
     Electronic devices generally have user control keys or buttons to provide basic activation and mode settings, such as power, volume, etc. Mechanical actuation of a key causes a circuit to open or close, signaling a change of state. Analog or digital components respond to the change of state due to the mechanical actuation. Although simple to implement, the mechanical actuation is associated with reliability limitations. A frequently-used key will eventually fail with repeated use. Solid state keys rely on a change in electrical characteristic such as resistance, capacitance or inductance based on user actuation. Sensing integrated circuits (ICs) detect changes in the electrical characteristic of the solid state switch to generate a corresponding input state. By eliminating moving parts, solid state keys can have increased reliability over mechanically actuated keys. 
     Power keys are an example of a user control key that receives frequent use and whose reliability is essential for the operational use of an electronic device. Often such keys are required to be used when a controlled component may be in an unpowered, inactivated state. Errors that may occur in the sensing IC can leave the electronic device inoperable without a way to power up a processor or other essential component. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The description of the illustrative embodiments can be read in conjunction with the accompanying figures. It will be appreciated that for simplicity and clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements are exaggerated relative to other elements. Embodiments incorporating teachings of the present disclosure are shown and described with respect to the figures presented herein, in which: 
         FIG.  1    is a functional block diagram illustrating a mobile electronic device having a solid state switch (SSS) monitoring system, according to one or more embodiments; 
         FIG.  2    depicts a functional block diagram of an example electronic device having an SSS monitoring system that ensures reliable activation from low power operation, according to one or more embodiments; 
         FIG.  3    depicts a flow diagram of a method for sensing an actuation state of a solid state switch by an electronic device, according to one or more embodiments; 
         FIG.  4    is a flow diagram of a method for correcting an inoperative state of an SSS sensing component to restore operation of the solid state switch, according to one or more embodiments; and 
         FIG.  5    is a flow diagram of a distributed method for solid state switch sensing with supervisory control to mitigate an inoperative state, according to one or more embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     According to aspects of the present innovation, a solid state switch (SSS) monitoring system of an electronic device and a method are provided to enable reliable use of solid state switches. Solid state switches often inherently do not mechanically wear out as quickly as mechanical switches and are not affected by external factors like Hall Effect sensors. However, active sensing has to also be reliable. 
     According to one aspect, an SSS sensing component is coupled to a solid state switch. The SSS sensing component polls a solid state switch such as a power key when other functional components of the electronic device are powered down or in low power inactive state. The SSS sensing component periodically generates a clocked pulse that polls the solid state switch. The SSS sensing component determines whether an electrical characteristic of an output of the solid state switch indicates that the solid state switch is actuated. The SSS sensing component generates a switch state signal to indicate a corresponding one of an actuated and an unactuated state of the solid state switch. To mitigate instances in which the SSS sensing component becomes inoperative due to a fault that prevents polling the solid state switch, a supervisory controller (“controller”) is communicatively coupled to the SSS sensing component. The controller restarts the SSS sensing component in response to determining that the SSS sensing component is in an inoperative state. 
     In the following detailed description of exemplary embodiments of the disclosure, specific exemplary embodiments in which the various aspects of the disclosure may be practiced are described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that logical, architectural, programmatic, mechanical, electrical and other changes may be made without departing from the spirit or scope of the present disclosure. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present disclosure is defined by the appended claims and equivalents thereof. Within the descriptions of the different views of the figures, similar elements are provided similar names and reference numerals as those of the previous figure(s). The specific numerals assigned to the elements are provided solely to aid in the description and are not meant to imply any limitations (structural or functional or otherwise) on the described embodiment. It will be appreciated that for simplicity and clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements are exaggerated relative to other elements. 
     It is understood that the use of specific component, device and/or parameter names, such as those of the executing utility, logic, and/or firmware described herein, are for example only and not meant to imply any limitations on the described embodiments. The embodiments may thus be described with different nomenclature and/or terminology utilized to describe the components, devices, parameters, methods and/or functions herein, without limitation. References to any specific protocol or proprietary name in describing one or more elements, features or concepts of the embodiments are provided solely as examples of one implementation, and such references do not limit the extension of the claimed embodiments to embodiments in which different element, feature, protocol, or concept names are utilized. Thus, each term utilized herein is to be given its broadest interpretation given the context in which that term is utilized. 
     As further described below, implementation of the functional features of the disclosure described herein is provided within processing devices and/or structures and can involve use of a combination of hardware, firmware, as well as several software-level constructs (e.g., program code and/or program instructions and/or pseudo-code) that execute to provide a specific utility for the device or a specific functional logic. The presented figures illustrate both hardware components and software and/or logic components. 
     Those of ordinary skill in the art will appreciate that the hardware components and basic configurations depicted in the figures may vary. The illustrative components are not intended to be exhaustive, but rather are representative to highlight essential components that are utilized to implement aspects of the described embodiments. For example, other devices/components may be used in addition to or in place of the hardware and/or firmware depicted. The depicted example is not meant to imply architectural or other limitations with respect to the presently described embodiments and/or the general invention. 
     The description of the illustrative embodiments can be read in conjunction with the accompanying figures. Embodiments incorporating teachings of the present disclosure are shown and described with respect to the figures presented herein. 
       FIG.  1    is a functional block diagram illustrating example mobile electronic device  100  having a solid state switch monitoring system  101  of one or more solid state switches. In one or more embodiments, the solid state switch is a selected one of: (i) a capacitive switch; (ii) a resistive switch; (iii) an inductive switch; and (iv) a piezoresistive switch. In a particular embodiment, the solid state switch is a power switch, depicted as power key  102   a  and volume key  102   b , which can be actively monitored when other functional components of mobile electronic device  100  are inactive. 
     Mobile electronic device  100  can be one of a host of different types of devices, including but not limited to, a mobile cellular phone, satellite phone, or smart-phone, a laptop, a net-book, an ultra-book, a networked smart watch or networked sports/exercise watch, and/or a tablet computing device or similar device that can include wireless communication functionality. As a device supporting wireless communication, mobile electronic device  100  can be utilized as, and also be referred to as, a system, device, subscriber unit, subscriber station, mobile station (MS), mobile, mobile device, remote station, remote terminal, user terminal, terminal, user agent, user device, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), computer workstation, a handheld device having wireless connection capability, a computing device, or other processing devices connected to a wireless modem. These various devices all provide and/or include the necessary hardware and software to support the various wireless or wired communication functions as part of a communication system. Mobile electronic device  100  can also be an over-the-air link in a communication system. Mobile electronic device  100  can be intended to be portable, hand-held, wearable, detachable, positioned in a fixed location, or mounted to a movable vehicle. Examples of such over-the-air link communication devices include a wireless modem, an access point, a repeater, a wirelessly-enabled kiosk or appliance, a femtocell, a small coverage area node, and a wireless sensor, etc. Mobile electronic device  100  can have computing functionality directed to local functionality without wide area communication capabilities. 
     Referring now to the specific component makeup and the associated functionality of the presented components, mobile electronic device  100  includes over-the-air (OTA) communication subsystem  104  that communicates with external OTA communication system  105 . Mobile electronic device  100  provides computing and data storage functionality in support of OTA communication with external OTA communication system  105 . Mobile electronic device  100  also provides other functions with host controller  106 , data storage subsystem  107 , and input/output (I/O) subsystem  108  that are communicatively coupled to each other via a system interlink  103 . 
     OTA communication subsystem  104  includes communication module  109  that operates in baseband to encode data for transmission and decodes received data, according to a predetermined communication protocol. OTA communication subsystem  104  includes radio frequency (RF) front end  110  having one or more modem(s)  111 . Modem(s)  111  modulate baseband encoded data from communication module  109  onto a carrier signal to provide a transmit signal that is amplified by transmitter(s)  112 . Modem(s)  111  demodulates the received signal from cell  113  or node  114  detected by antenna subsystem  115 . The received signal is amplified and filtered by receiver(s)  116 , which demodulate received encoded data from a received carrier signal. Antenna tuning circuitry  117  adjusts antenna impedance of antenna subsystem  115 . Antenna tuning circuitry  117  improves antenna efficiency at desired transmit or receive frequencies of transmitter(s)  112  and receiver(s)  116 , respectively, within transceiver(s)  118 . In one or more embodiments, electronic device  100  is proximate to, or on, a body generating a lossy dielectric effect for mobile electronic device  100 . Antenna tuning circuitry  117  is electrically coupled to antenna subsystem  115  to compensate for a lossy dielectric effect of being proximate to a person  119 . RF front end  110  can include proximity detection component  120  that monitor for a capacitive effect on antenna subsystem  115  for limiting transmit power set by transmit power controller  121 . 
     Host controller  106  controls the OTA communication subsystem  104 , user interface device  122 , and other functions and/or operations of mobile electronic device  100 . These functions and/or operations include, but are not limited to including, application data processing and signal processing. Mobile electronic device  100  may use hardware component equivalents for application data processing and signal processing. For example, mobile electronic device  100  may use special purpose hardware, dedicated processors, general purpose computers, microprocessor-based computers, micro-controllers, optical computers, analog computers, dedicated processors and/or dedicated hard wired logic. As utilized herein, the term “communicatively coupled” means that information signals are transmissible through various interconnections, including wired and/or wireless links, between the components. The interconnections between the components can be direct interconnections that include conductive transmission media or may be indirect interconnections that include one or more intermediate electrical components. Although certain direct interconnections (interlink  103 ) are illustrated in  FIG.  1   , it is to be understood that more, fewer, or different interconnections may be present in other embodiments. 
     In one or more embodiments, host controller  106 , via OTA communication subsystem  104 , performs multiple types of OTA communication with external OTA communication system  105 . OTA communication subsystem  104  can communicate with one or more personal access network (PAN) devices within external OTA communication system  105 , such as smart watch  122  and wireless headset  123  that is reached via Bluetooth connection. In one or more embodiments, OTA communication subsystem  104  communicates with one or more locally networked devices via a wireless local area network (WLAN) link provided by node  114 . Node  114  is in turn connected to wide area network  124 , such as the Internet. In one or more embodiments, OTA communication subsystem  104  communicates with global positioning system (GPS) satellites  125  to obtain geospatial location information. In one or more embodiments, OTA communication subsystem  104  communicates with radio access network (RAN)  126  having respective base stations (BSs) or cells  113 . RANs  126  are a part of a wireless wide area network (WWAN) that is connected to wide area network  124  and provides data and voice services. In one or more embodiments, antenna subsystem  115  includes multiple antenna elements  127   a - n  that are individually tuned to selected RF bands to support different RF communication bands and protocols. Antenna elements  127   a - n  can be used in combination for multiple input multiple output (MIMO) operation for beam steering and spatial diversity. 
     The techniques described herein may be used for various wireless communication networks that operate according to, but not limited to, any one or more of the OMA (Open Mobile Alliance), 3GPP (3rd Generation Partnership Project), 3GPP2 (3rd Generation Partnership Project 2), IEEE (Institute of Electrical and Electronics Engineers) 802.xx, and WiMAX Forum standards. The terms “networks” and “systems” are often used interchangeably. Such communication networks can be Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, Single-Carrier FDMA (SC-FDMA) networks, etc. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA 2000, etc. UTRA includes Wideband-CDMA (W-CDMA) and time division synchronous code division multiple access (TD-SCDMA). CDMA2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network may implement a radio technology such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM, etc. UTRA, E-UTRA, and GSM are part of Universal Mobile Telecommunication System (UMTS). Long Term Evolution (LTE) is a recent release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from the 3GPP organization. CDMA2000 is described in documents from the 3GPP2 organization. These various radio technologies and standards are known in the art. Aspects of the present innovation can further be implemented with 5G (short for 5th Generation), which is a commonly used term for certain advanced wireless systems. Industry association 3GPP defines any system using “5G NR” (5G New Radio) software as “5G”, a definition that came into general use by late 2018. Others may reserve the term for systems that meet the requirements of the ITU IMT-2020, which represents more nations. 3GPP will submit their 5G NR to the ITU. 5G follows 2G, 3G and 4G and their respective associated technologies (such as GSM, UMTS, LTE, LTE Advanced Pro, etc.). 
     Host controller  106  includes processor subsystem  128 , which executes program code to provide functionality of mobile electronic device  100 . Processor subsystem  128  includes one or more central processing units (CPUs) (“data processor”)  129 . In one or more embodiments, processing subsystem  128  includes a digital signal processor (DSP)  130 . Host controller  106  includes system memory  131 , which contains actively used program code and data. In one or more embodiments, system memory  131  includes therein a plurality of such program code and modules, including applications  132 . System memory  131  can also include operating system (OS)  133 , firmware interface  134  such as basic input/output system (BIOS) or Uniform Extensible Firmware Interface (UEFI), and platform firmware  135 . These software and/or firmware modules have varying functionality when their corresponding program code is executed by processor subsystem  128  or secondary processing devices within mobile electronic device  100 . 
     Data storage subsystem  107  provides nonvolatile storage accessible to host controller  106 . For example, data storage subsystem  107  can provide a large selection of other applications  132  that can be loaded into system memory  131 . In one or more embodiments, local data storage device(s)  137  includes hard disk drives (HDDs), optical disk drives, solid state drives (SSDs), etc. In one or more embodiments, removable storage device (RSD)  138  that is received in RSD interface  139  is a computer program product or computer readable storage device, which can be referred to as non-transitory. RSD  138  can be accessed by host controller  106  to provision mobile electronic device  100  with program code. When executed by host controller  106 , the program code provides functionality to mobile electronic device  100  to perform processing, communication and other tasks. 
     I/O subsystem  108  includes input and output devices. For example, motion sensor  140  detects accelerations of mobile electronic device  100 , which can indicate context of use as well as intentional gestures. Ambient light sensor  141  detects external light for adjusting brightness settings and for also indicating contextual information. User interface device  122  presents visual or tactile outputs as well as receives user inputs. Tactile/haptic control  142  provides an interface, such as for braille reading or manual inputs. Range finder  143  emits a waveform of energy, such as acoustic, infrared, radio frequency (RF), etc., whose time of flight is used to measure distance to a reflecting object. Audio speaker  144  provides audio output, including audio playback and alerts. Microphone  145  receives audible inputs. Ultrasonic proximity sensor  146  detects proximity of an ear of a user to audio speaker  144 , including in one or more embodiments recognizing audio feedback from the ear canal. Optical proximity sensor  147  detects proximity of the hand or face of the user to mobile electronic device  100 . Image capturing device  148 , such as a camera, can receive gestures and other image data. I/O subsystem  108  can be wholly or substantially encompassed by device housing  149 . In one or more embodiments, I/O controller  150  connects to one or more peripheral devices  151  that can include additional I/O functionality. I/O controller  150  can also interface to a wired local access network (LAN) (not shown). 
     In one or more embodiments, electrical power from battery  152  powers solid state switch (SSS) monitoring system  101  when other subsystems such as host controller  106  and OTA communication subsystem  104  may be inactive to conserve power. SSS sensing component  153  monitors power and volume keys  102   a ,  102   b  for actuation. Supervisory controller  154  monitors SSS sensing component  153  and can detect when SSS sensing component  153  becomes inoperative. Supervisory controller  154  restarts SSS sensing component  153  to return SSS sensing component  153  to operation. 
       FIG.  2    depicts example electronic device  200  having solid state switch (SSS) monitoring system  202  that ensures reliable activation from low power operation. Electronic device  200  may be a laptop computer, tablet computer, personal computer, computer work station, embedded automobile computing systems, or mobile communication devices such as mobile electronic device  100  ( FIG.  1   ). One or both of battery  204  and electrical outlet  206  provide electrical power to SSS monitoring system  202  and functional components such as processor  208  of electronic device  200 . SSS monitoring system  202  includes SSS sensing component  210  that is electrically coupled to the solid state switch  212 . SSS sensing component  210  periodically generates clocked pulse  211  that polls solid state switch  212 . SSS sensing component  210  determines whether an electrical characteristic of output  214  of solid state switch  212  indicates that solid state switch  212  is actuated. SSS sensing component  210  generates switch state signal  216  to indicate a corresponding one of: (i) an actuated; and (ii) an unactuated state of solid state switch  212 . For example, a functional component such as processor  208  can respond to a state of switch state signal  216 . For example, an inactive processor  208  activates in response to receiving switch state signal  216  indicating the actuated state. Supervisory controller (“controller”)  218  monitors SSS sensing component  210  for becoming inoperative. Controller  218  restarts SSS sensing component  210  when SSS sensing component  210  is detected as inoperative. 
     In one or more embodiments, SSS sensing component  210  detects a state of solid state switch  212 , which can be inductive, resistive, or inductive. In one or more embodiments, solid state switch  212  uses only 2 In one or more embodiments, SSS sensing component  210  triggers voltage regulator  213  to send a high frequency pulse at programmable duty cycles to poll inductive solid state switch  212  based on duty-cycle clock  214 . For example, a 1 ms pulse containing high signal frequencies can be followed by an off cycle of 12 ms to 1700 ms. The duration of the on-cycle can be based on having sufficient time for SSS monitoring system  202  to measure output  215  of solid state switch  212 . The duration of the off-cycle can be made depending on a design selection that is a tradeoff between power consumption and detection latency by SSS monitoring system  202 . The pulse passes through inductor coil  220 , which changes electrical properties when ferrous material target  222 , such as a printed circuit on a flexible substrate, is manipulated in close proximity to inductor coil  220 . A change in the frequency of the pulse contained in output  215  is detected by SSS sensing component  210  as a key event. 
     In one or more embodiments, SSS sensing component  210  is DC isolated from controller  218  by series coupling capacitor  224 . Controller  218  has peak detector  226  including analog-to-digital converter (ADC)  228  that latches to the peak voltage of output  215  of solid state sensor  212  to detect clocked pulse  211  from SSS sensing system  210 . If clocked pulse  211  is detected within the defined timeframe, a “TRUE” logic value is set and timer  230  is reset. If clocked pulse  211  is not detected within the defined timeframe based on timer  230 , a “FALSE” logic value is set. In one or more embodiments, the defined timeframe is 5 s, although shorter or longer defined timeframes may be used. SSS sensing component  210 . The reset of LDO regulator  232  causes SSS sensing component  210  to restart, clearing a latched or other error condition that led to an inoperative state. 
       FIG.  3    depicts method  300  for sensing an actuation state of a solid state switch  212  ( FIG.  2   ) by electronic device  200  ( FIG.  2   ). Method  300  includes, in decision block  302 , determining, by solid state switch (SSS) sensing component  210  ( FIG.  2   ), whether a power up event has occurred to the SSS sensing component. Although not depicted, SSS sensing component  210  ( FIG.  2   ) is not capable of making this determine before actually being powered up. SSS sensing component is determining whether SSS sensing component is in an uninitialized state following power up. In response to determining that a power up event has occurred, SSS sensing component performs initialization, which clears any latched or error state (block  304 ). In response to determining that a power up event has not occurred in decision block  302  or after performing initialization in block  304 , SSS sensing component periodically polls a solid state switch of an electronic device with a clocked pulse (block  306 ). Method  300  includes, in decision block  308 , determining, by the SSS sensing component, whether an electrical characteristic of an output of the solid state switch indicates that the solid state switch is actuated. In response to determining that the solid state switch is actuated, method  300  includes generating a switch state signal that indicates an actuated state of the solid state switch (block  310 ). In response to determining that the solid state switch is not actuated, method  300  includes generating a switch state signal that indicates an unactuated state of the solid state switch (block  312 ). After generating the corresponding switch state signal in either block  310  or block  312 , method  300  includes enabling functional components to respond to the corresponding actuated or unactuated state of the solid state switch (block  314 ). Then method  300  returns to block  302 . 
       FIG.  4    depicts method  400  for monitoring for and correcting an inoperative state of the SSS sensing component  210  ( FIG.  2   ) to restore operation of the solid state switch  212  ( FIG.  2   ). Method  400  includes receiving, by controller  218  ( FIG.  2   ), the output of the solid state switch for monitoring of clocked pulses, whose absence is indicative of an inoperative state of the SSS sensing component that generates the clocked pulses (block  402 ). Method  400  includes, in decision block  404 , determining, by the controller, whether a predefined timeframe has elapsed based on a timer. In response to determining that the predefined timeframe has not elapsed, method  400  includes detecting a peak voltage of the output of the solid state switch using an analog-to-digital converter of the controller (block  406 ). The controller compares the peak voltage to a threshold value (block  408 ). A determination is made in decision block  410  whether the peak voltage is greater than the threshold value. In response to detecting that the peak voltage is greater than the threshold value, method  400  includes resetting the timer (block  412 ). Then method  400  returns to block  402 . In response to detecting that the peak voltage is not greater than the threshold value, method  400  returns to block  402 . In response to determining that the predefined timeframe has elapsed, at decision block  404 , method  400  includes interrupting a power supply, to the SSS sensing component for a period of time sufficient to shut down and restart the SSS sensing component that clears any latched or error condition (block  414 ). Method  416  includes delaying monitoring for a period of time sufficient for the SSS sensing component to restart (block  416 ). Method  400  returns to block  402 . 
       FIG.  5    is a flow diagram of distributed method  500  that includes method  500   a  of sensing actuation of a solid state switch by SSS sensing component  210 . Method  500  also includes method  500   b  of mitigating an inoperative state of SSS sensing component  210  by supervisory controller  218 . Distributed method  500  enables supervisory controller  218  to determine whether SSS sensing component  210  is inoperative based upon a signal generated by SSS sensing component  210 . Supervisory controller  218  avoids having to generate a testing signal to determine whether SSS sensing component  210  is inoperative. Method  500   a  includes performing a power on procedure by SSS sensing component (block  502 ). SSS sensing component sets supply voltage level V DD  for voltage regulator (block  504 ). Method  500   a  includes issuing an on-cycle power pulse from the voltage regulator to the solid state switch (block  506 ), which at line  508  enables supervisory controller  218  to begin method  500   b  that is executed in parallel to method  500   a.    
     Method  500   b  includes receiving an output from the solid state switch (block  510 ). In one or more embodiments, the on-cycle power pulse causes an electromagnetic signal to pass through a sensor of the solid state switch that is affected by changes in proximity of a conductive target that is moved by actuation. The affect may be capacitive, inductive or resistive. Based on the received output, SSS sensing component determines an actuated or unactuated state of the solid state switch (block  512 ). Method  500   a  includes generating a switch signal indicated the state that is determined (block  514 ). SSS sensing component waits for an off-cycle interval to reduce power consumption by the solid state switch (block  516 ). Then method  500   a  under normal operation returns to block  506 . However, SSS sensing component can become inoperative, as indicated in a dashed line to an inoperative state with no output (block  518 ). 
     With continued reference to method  500   b , controller detects the first on-cycle power pulse (block  520 ). Controller begins active monitoring for an inoperative state once operation of SSS sensing component is enabled by the first power pulse. Method  500   b  includes setting a timer block  522 ). The duration can be significantly longer than a duty cycle of the SSS sensing component such that a duration of time elapsed, or expiration of a timer, is associated with an inoperative SSS sensing component. A determination, in decision block  524 , is made whether the timer has expired. In response to determining that the timer has not expired, a determination is made in decision block  526  whether the next pulse is detected. In response to determining that the next pulse is not detected, method  500   b  returns to decision block  524 . In response to determining that the next pulse is detected, method  500   b  returns to block  522 . When SSS sensing component is inoperative (block  518 ), time will continue to elapse until the timer expires. In response to determining that the timer has expired in decision block  524 , method  500   b  includes restarting the SSS sensor component by the controller (block  528 ). Method  500   b  returns to block  520  to await being enabled to monitor for another inoperative state when the first pulse from SSS sensing component is detected. SSS sensing component is in a powered down state in response to the restart. Method  500   a  begins anew at block  502  when power is restored to SSS sensing component. 
     In each of the above flow charts presented herein, certain steps of the methods can be combined, performed simultaneously or in a different order, or perhaps omitted, without deviating from the spirit and scope of the described innovation. While the method steps are described and illustrated in a particular sequence, use of a specific sequence of steps is not meant to imply any limitations on the innovation. Changes may be made with regards to the sequence of steps without departing from the spirit or scope of the present innovation. Use of a particular sequence is therefore, not to be taken in a limiting sense, and the scope of the present innovation is defined only by the appended claims. 
     Aspects of the present innovation are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the innovation. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. 
     As will be appreciated by one skilled in the art, embodiments of the present innovation may be embodied as a system, device, and/or method. Accordingly, embodiments of the present innovation may take the form of an entirely hardware embodiment or an embodiment combining software and hardware embodiments that may all generally be referred to herein as a “circuit,” “module” or “system.” 
     While the innovation has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made, and equivalents may be substituted for elements thereof without departing from the scope of the innovation. In addition, many modifications may be made to adapt a particular system, device or component thereof to the teachings of the innovation without departing from the essential scope thereof. Therefore, it is intended that the innovation not be limited to the particular embodiments disclosed for carrying out this innovation, but that the innovation will include all embodiments falling within the scope of the appended claims. Moreover, the use of the terms first, second, etc. do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the innovation. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprise” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present innovation has been presented for purposes of illustration and description but is not intended to be exhaustive or limited to the innovation in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the innovation. The embodiments were chosen and described in order to best explain the principles of the innovation and the practical application, and to enable others of ordinary skill in the art to understand the innovation for various embodiments with various modifications as are suited to the particular use contemplated.