Abstract:
An apparatus in one example includes a die with at least first and second portions, the first portion of the die mechanically and electrically connectable with a circuit board. The apparatus includes an integrated circuit component mechanically and electrically connected with the second portion of the die. Upon operation the die serves to generate one or more electrical signals that are passed to the integrated circuit component.

Description:
CROSS-REFERENCE TO RELATED APPLICATION  
       [0001]    This application is a continuation-in-part of commonly-owned U.S. patent application Ser. No. (by Robert E. Stewart, filed May 24, 2002, and entitled “COMPLIANT COMPONENT FOR SUPPORTING ELECTRICAL INTERFACE COMPONENT”), which is hereby incorporated herein by reference in its entirety. 
     
    
     
       TECHNICAL FIELD  
         [0002]    The invention in one example relates generally to electromechanical systems and more particularly to connection between parts in an electromechanical system.  
         BACKGROUND  
         [0003]    A three dimensional die with multiple layers, as one example of an electrical circuit, requires electrical connections to multiple layers. For example, wire bonds serve to provide the electrical connections between the layers. In some cases, the wire bonds must be made to contacts on both the top and bottom of the die. Having wire bond contacts on both the top and bottom of the die can result in the need to fabricate subassemblies with wire bonds wrapping around multiple sides of the die. Having wire bonds that wrap around multiple sides of a die make the die difficult to package. Having wire bonds wrap around the die increases the periphery of the die. Having a larger periphery increases the space used by the die when the die is mounted to a substrate, circuit board, or the like. In addition, wire bonds are very thin and therefore susceptible to stress damage.  
           [0004]    In another example, the die is packaged in a housing with electrical feed throughs. Wire bond contacts are made to electrical contacts on different layers of the die. These bond wires are then attached to feed throughs in the housing. The feed throughs in the housing allow for an interface with a substrate, circuit board, or the like. Creating the wire bonds and electrical feed through is complicated to assemble, expensive, and fragile.  
           [0005]    In another example, the die has one or more layers. The die makes an electrical connection to a substrate, circuit board, or the like, of a different material than the die. Since the materials are different, they are likely to have different expansion/contraction coefficients. When expansion occurs in one or both of the materials, a stress is placed on the connection between the two materials. When the stress is large enough the connection can fail or break.  
           [0006]    In another example, the die makes an electrical connection to a substrate, circuit board, or the like. When translational or rotational movement occurs a stress is placed on the connection between the die and the substrate, circuit board, or the like.  
           [0007]    In another example, processing electronics are used in combination with the die. Both of the processing electronics and the die must make an electrical connection to a substrate, circuit board, or the like. Two separate connection spaces must be used on the substrate, circuit board, or the like.  
           [0008]    In another example, the processing electronics and the die must go through testing together. To test the processing electronics and the die together they must be installed to a substrate, circuit board, or the like.  
           [0009]    Thus, a need exists for a die that has increased durability in the interface between the die and a compatible structure. A need also exists for a die with decreased size. A need also exists for a die that is easier to electrically interface with compatible structures. A need also exists for a die and processing electronics to use a same connection space. A need also exists for a die and processing electronics to be tested before installation to a substrate, circuit board, or the like.  
         SUMMARY  
         [0010]    The invention in one embodiment encompasses an apparatus. The apparatus includes a die with at least first and second portions, the first portion of the die mechanically and electrically connectable with a circuit board. The apparatus includes an integrated circuit component mechanically and electrically connected with the second portion of the die. Upon operation the die serves to generate one or more electrical signals that are passed to the integrated circuit component. 
       
    
    
     DESCRIPTION OF THE DRAWINGS  
       [0011]    Features of exemplary implementations of the invention will become apparent from the description, the claims, and the accompanying drawing in which:  
         [0012]    [0012]FIG. 1 is one example of an apparatus that includes a die that comprises one or more layers, one or more connection paths, one or more electrical contact locations, one or more electrical interface components, and one or more compliant components.  
         [0013]    [0013]FIG. 2 is one exploded representation of the die of the apparatus of FIG. 1.  
         [0014]    [0014]FIG. 3 is one example of an electrical connection between the die and a separate layer of the apparatus of FIG. 1.  
         [0015]    [0015]FIG. 4 is a sectional representation of the die directed along line  4 - 4  of FIG. 1.  
         [0016]    [0016]FIG. 5 is a sectional representation of the die directed along line  5 - 5  of FIG. 1.  
         [0017]    [0017]FIG. 6 is a sectional representation of the die directed along line  6 - 6  of FIG. 1.  
         [0018]    [0018]FIG. 7 is one example of a compliant component of the apparatus of FIG. 1.  
         [0019]    [0019]FIG. 8 is another example of the die of the apparatus of FIG. 1.  
         [0020]    [0020]FIG. 9 is yet another example of the die of the apparatus of FIG. 1.  
         [0021]    [0021]FIG. 10 is a further example of the die of the apparatus of FIG. 1.  
         [0022]    [0022]FIG. 11 is one example of a wafer fabrication pattern of the die of the apparatus of FIG. 1.  
         [0023]    [0023]FIG. 12 is a representation of the die of the apparatus of FIG. 1 and an electrical component receivable in a recess of the die.  
         [0024]    [0024]FIG. 13 is a representation of the die of the apparatus of FIG. 1 and an electrical component connected with the die.  
         [0025]    [0025]FIG. 14 is a representation of the die of the apparatus of FIG. 1 and an electrical component connected with the die.  
         [0026]    [0026]FIG. 15 is a representation of one example of connection among the die, an electrical component, and a separate layer of the apparatus of FIG. 1.  
         [0027]    [0027]FIG. 16 is a representation of one example of connection among the die and a separate layer of the apparatus of FIG. 1. 
     
    
     DETAILED DESCRIPTION  
       [0028]    Turning to FIGS.  1 - 3 , an apparatus  100  in one example comprises one or more dice  102  and one or more separate layers  310 . The die  102  comprises, for example, a micro-electro-mechanical system (“MEMS”), sensor, actuator, accelerometer, switch, stress sensitive integrated circuit, or the like. The die  102  includes one or more layers  160 ,  162 ,  164 , one or more compliant components  104 , 106 , 108 , 110 , 112 ,  114 , 116 ,  118 , one or more electrical interface components  120 ,  122 ,  124 ,  126 ,  128 ,  130 ,  132 ,  134 , and one or more connection paths  136 ,  138 ,  140 ,  142 ,  144 ,  146 ,  148 ,  120 . The separate layer  310  in one example comprises a substrate, circuit board, electronic device, die, or the like.  
         [0029]    Referring to FIGS. 4 and 5, the one or more layers  160 ,  162 ,  164  in one example comprises, semiconductors, insulators, conductors, or the like.  
         [0030]    Referring to FIG. 6 (a cross section  6 - 6  of FIG. 1), in one example, the compliant component  116  is located in an etched well  610  on the cover  160  of the die  102 . The well  610  is a large enough size and shape to allow for the flexing of the compliant component  116 . In another example, the compliant component  116  is on a surface  180  of the cover  160  of the die  102 .  
         [0031]    Referring to FIGS. 1 and 7, the compliant component  114  in one example comprises a flexible arm  710 . The flexible arm  710  is attached both to the die  102  and the electrical interface component  130 . In one example, the die  102  is etched in a pattern such that the arm  710  and the electrical interface component  130  have the space to be able to flex in response to stress applied to the flexible arm  710 . In another example, the compliant component  114  is a beam that is micro machined into the die  102 .  
         [0032]    In one example, referring to FIG. 7, the compliant component  114  comprises a flexible arm  710 . In one example, the flexible arm  710  and the cover  160 , or the like, are etched from a single homogeneous material. In another example, the flexible arm  710  is etched from a separate homogeneous material as the cover  160 , then attached to the cover  160 , or the like. In another example, the flexible arm  710  is etched from a heterogeneous material as the cover  160 , then attached to the cover  160 , or the like.  
         [0033]    In one example, the flexible arm  710  is a straight linear structure. In another example, the flexible arm  710  has one or more unstressed bends, or curves, or the like. In another example, the flexible arm  710  is a plurality of flexible arms.  
         [0034]    Referring to FIG. 9, in one example a subset of the compliant components  108 ,  110 ,  116 ,  118  are designed to be compliant to translational movement in a single direction as well as being compliant with the direction of movement due to expansion. In one example, the translational movement in a single direction is horizontal on the die  102  plane. In another example, the translational movement in a single direction is vertical on the die  102  plane. The compliant component  104 ,  106 ,  108 ,  110 ,  112 ,  114 ,  116 ,  118  orientation of FIG. 9 allows the overall connection of the die  102  to the separate layer  310  to be compliant to translational movement in a single direction as well as being compliant with the direction of movement due to expansion.  
         [0035]    Referring to FIG. 10, in one example first subset of the compliant components  108 ,  110 ,  116 ,  118  are designed to be compliant to translational movement in a first direction as well as being compliant with the direction of movement due to expansion. A second subset of the compliant components  104 ,  106 ,  112 ,  114  are designed to be compliant to translational movement in a second direction as well as being compliant with the direction of movement due to expansion. In one example the first direction is different from that of the second direction in the plane of the die  102 . The compliant component  104 ,  106 ,  108 ,  110 ,  112 ,  114 ,  116 ,  118  orientation of FIG. 10 allows the overall connection of the die  102  to the separate layer  310  to be compliant to translational movement in multiple directions, compliant to rotation, as well as being compliant with the direction of movement due to expansion. In one example, the translational movement is horizontal on the die  102  plane. In another example, the translational movement is vertical on the die  102  plane. In another example, the translational movement is vertical and horizontal on the die  102  plane. A die  102  connection compliant to translational, rotational, and expansion movements has a use in applications that are, in one example, counter balanced mechanical resonators. The resonators have one or more masses vibrating out of phase with each other. In one example, the masses need to vibrate at a same frequency. When used in such an application the compliant mounting structures  104 ,  106 ,  108 ,  110 ,  112 ,  114 ,  116 ,  118  that allow translational, rotational, and expansion movements will couple the two masses together so they vibrate at the same frequency.  
         [0036]    The electrical interface component  130 , in one example is a conductive pad, or the like. In another example, the electrical interface component  130  is a solder ball, or the like. In another example, the electrical interface component  130  is a solder ball, or the like, connected to a conductive pad, or the like. The electrical interface component  130  is electrically insulated from the die  102 .  
         [0037]    In one example, the connection path  144  is a signal routing trace. The connection path  144  is used to pass the electrical signal from one of the one or more layers  160 ,  162 ,  164  to the electrical interface component  130  on the interfacing surface  180 .  
         [0038]    In one example, a connection between the die  102  and the separated layer  310  can be accomplished by using one or more of flip chip technology, ball grid array technology and pad grid array technology. Ball grid arrays are external connections that are arranged as an array of conducting pads on a interfacing surface  180  of the die  102 . For explanatory purposes, the figures represent one example of the apparatus  100  that employs exemplary ball grid array technology. An electrical connection between a layer contact  190 ,  430 ,  432 ,  434 ,  436 ,  438 ,  440 , and the electrical interface component  120 ,  122 ,  124 ,  126 ,  130 ,  132 ,  134  is made through the connection path  136 ,  138 ,  140 ,  142 ,  144 ,  146 ,  148 . In one example, one or more of the electrical interface components  128  are not used to electrically interface the die  102  to the separate layer  310 . In one example, the electrical interface component  128  is extra for the specific example of the die  102 . In another example, the electrical interface component  128  is intended to accommodate a possible future increase in the number of layer contacts  190 ,  430 ,  432 ,  434 ,  436 ,  438 ,  440  in the die  102 .  
         [0039]    Referring to FIGS. 1, 3,  4  and  5 , in one example each of the layers  160 ,  162 ,  164 , of a die  102 , requiring an electrical connection to a separate layer  310  brings its connection to a single interfacial surface  180  for interface with the separate layer  310 . In one example, to access the various layers  160 ,  162 ,  164  of the die  102 , one or more notches  150 ,  152 ,  154 ,  156  are created in the die  102 .  
         [0040]    In one example, the notch  156  could be a hole, cutout, path, window, opening and/or the like. The notch  156  can be at any location on the die  102 . The notch  156  can be designed to reach any or all levels and/or depths. One or more layer contacts  430 ,  432 ,  434 ,  436 ,  438 ,  440  can be reached through the same notch  156 . Each of the notches  150 ,  152 ,  154 ,  156  can be a different size, shape, or depth than any other of the notches  150 ,  152 ,  154 ,  156 .  
         [0041]    Referring to FIG. 11, the notch  156  is etched at the wafer level in order to take advantage of batch processing. In one example, the notches  150 ,  152 ,  154 ,  156  are etched on the wafer to be a consistent size and depth. In one example, the notches  150 ,  152 ,  154 ,  156  are etched on the wafer to be different sizes and depths. In one example, the etch could be an anisotropic wet etch. In another example, the etch could be a dry reactive ion etch, or the like.  
         [0042]    Referring to FIGS.  1 - 5 , the layer contact  434  connection is brought to the single interfacial surface  180  by using a connection path  144 . The connection path  144  uses the notch  156  to reach the respective die  102  layer contact  434 . An insulator  410  is used to separate the connection path  144  from layer  160  and the other layer contacts  190 ,  430 ,  432 ,  436 ,  438 ,  440 . In one example, the insulator  410  is a silicon dioxide dielectric insulation layer.  
         [0043]    In one example, the die  102  has one or more layer contacts  430 ,  432 ,  434 ,  436 ,  438 ,  440  that are located on a different layer  162 ,  164  than the layer  160  being used for interfacing to a separate layer  310 . Each layer  160 ,  162 ,  164  may have more than one layer contact  190 ,  430 ,  432 ,  434 ,  436 ,  438 ,  440 . An insulator  412 ,  416 ,  418 ,  420 ,  422 ,  426  is used to separate each layer  160 ,  162 ,  164  from the layer contacts  190 ,  430 ,  432 ,  434 ,  436 ,  438 ,  440  of the other layers  160 ,  162 ,  164 , and the other layers  160 ,  162 ,  164  themselves. In one example, the insulator  412 ,  416 ,  418 ,  420 ,  422 ,  426  is a silicon dioxide dielectric insulation layer.  
         [0044]    In one example, the die  102  and the separate layer  310  may not to be the same material, and therefore may not have the same expansion coefficients. When the die  102  and the separate layer  310  are connected together and thermal changes, or any other expansion/contraction force, occur the die  102  will expand/contract by one amount and the separate layer  310  expands/contracts by another amount, different from that of the amount of the die  102 . When the amount of expansion/contraction is different in the die  102  than in the separate layer  310 , there will be a stress applied at the connection of the die  102  and the separate layer  310 . This stress is relieved at the connection between the die  102  and the separate layer  310  by the flexing of the compliant component  114 .  
         [0045]    In one example, as shown in FIGS. 1, 7, and  8 , the stress applied to the connection is likely to be in a radial direction from/to the midpoint  158  of the die  102  to/from the electrical interface component  130 . In one example, the flexible arm  710  attached to the electrical interface component  130 , is oriented perpendicular to the radial axis. When the stress in likely to be in a radial direction this perpendicular flexible arm  710  orientation provides a unstressed starting point for the electrical interface component  130 . This unstressed starting point provides wide range of motion in either radial direction. In another example, as shown in FIG. 8, the flexible arm  710  attached to the electrical interface component  130 , is oriented parallel to one or more of the die  102  edges.  
         [0046]    Referring to FIGS. 4 and 5, in one example, the die  102  is a sensor system. The die  102  has three element layers, a top cover  160 , bottom cover  164 , and a sensing center element  162 . Each element layer  160 ,  162 ,  164  has a dielectric insulating layer  412 ,  416 ,  418 ,  420 ,  422 ,  426  added to each surface that will be bonded to another surface. A conducting material  414 ,  424  is laid down on the dielectric insulating layer  412 ,  416 ,  418 ,  420 ,  422 ,  426  of each of the top cover  160 , and the bottom cover  164  on the surface that is adjacent to the center element  162 . A dielectric insulating layer  412 ,  416 ,  418 ,  420 ,  422 ,  426  is laid down over the conducting materials  414 ,  424 . The three element layers  160 ,  162 ,  164  are bonded together.  
         [0047]    In one example, a plurality of layer contacts  430 ,  432 ,  434 ,  436 ,  438 ,  440  are buried between the layers  160 ,  162 ,  164  of the die  102 . The layer contacts  430 ,  432 ,  434 ,  436 ,  438 ,  440  are required to be on a interfacing surface  180  for the die  102  to be mounted directly to the separate layer  310 , such as a substrate or circuit board. The interfacing surface  180  has a plurality of electrical interfacing components  120 ,  122 ,  124 ,  126 ,  128 ,  130 ,  132 ,  134 . Notches  150 ,  152 ,  154 ,  156  are made through the die  102  to expose the buried layer contacts  430 ,  432 ,  434 ,  436 ,  438 ,  440 . Along the walls of the notch  156  a dielectric insulating layer  410  is applied to separate the connection path  144  from the element layers  160 ,  162 ,  164  and the other layer contacts  430 ,  432 ,  436 ,  438 ,  440 . The desired layer contact  434  will not be covered by the dielectric insulating layer  410  to allow connection between the layer contact  434  and the connection path  144 . The connection path  144  is used to pass the electrical signal from the layer contact  434  to the electrical interface component  130  on the interfacing surface  180 . In one example, the connection path  144  is a signal routing trace. The electrical interface component  130  on the interfacing surface  180  is attached to compliant component  114 . The compliant component  114  allows the die  102  to directly connect to the separate layer  310  with the same expansion properties or the separate layer  310  with different expansion properties.  
         [0048]    Turning to FIGS.  12 - 15  an apparatus  100 , in another example, comprises one or more dice  102 , one or more electrical components  1220 , and one or more separate layers  310 . The die  102  in one example further comprises, one or more connection paths  1204  and  1206 , and one or more electrical interface components  1208  and  1210 . The electrical component  1220  in one example comprises one or more of processing electronics, central processing unit (“CPU”), integrated circuit, and application specific integrated circuit (“ASIC”). The electrical component  1220  in one example comprises one or more electrical interface components  1222  and  1224 .  
         [0049]    In one example, the connection paths  1204  and  1206  are signal routing traces. In one example, the connection paths  1204  and  1206  comprise a conducting material. The connection path  1204  is used to pass the electrical signal from one of the one or more layers  160 ,  162 ,  164 , exposed by notch  156 , to the electrical interface component  1208 .  
         [0050]    The one or more electrical interface components  1208  and  1210  in one example comprise one or more of electrical contacts, conductive pads, and solder balls. The one or more electrical interface components  1208  and  1210  are electrically insulated from the die  102 .  
         [0051]    Referring to FIG. 12, in one example, the electrical component  1220  and the die  102  are made from a same material, and therefore are not likely to experience differences in expansion. In one example, the connection between the electrical component  1220  and the die  102  can be accomplished by using one or more of flip chip technology, ball grid array technology, and pad grid array technology. In one example, the connection between the electrical component  1220  and the die  102  is made through one or more solder balls. The one or more solder balls electrically and mechanically connect the electrical component  1220  to the die  102 . The one or more solder balls comprise a conductive material to electrically connect the electrical component  1220  to the die  102 . The one or more solder balls comprise a bonding material to mechanically connect the electrical component  1220  to the die  102 .  
         [0052]    In another example, the electrical component  1220  and the die  102  are made from different materials, and therefore are likely to experience differences in expansion. In one example, the expansion is due to one or more of thermal changes, material aging, difference in stability, and moisture swelling. In addition to one or more of flip chip technology, ball grid array technology, and pad grid array technology, the connection between the electrical component  1220  and the die  102 , would benefit from using a compliant mounting component to support the electrical interface components  1208  and  1210 . The compliant mounting component in one example comprises a structure similar to compliant component  114 . The connection between the electrical component  1220  and the die  102  using the compliant component  114  is forgiving to differences in relative movement between the electrical component  1220  and the die  102 .  
         [0053]    Referring to FIG. 12, an electrical connection, to route the electrical signal between a layer contact  1212  and the electrical interface component  1208 , is made through the connection path  1204 . The electrical interface component  1208  transfers the electrical signal to electrical interface component  1222  of the electrical component  1220 . In one example, the electrical interface component  1222  comprises an input to the electrical component  1220 . In one example, the electrical component  1220  processes one or more electrical signals from the die  102 . In one example, the processed electrical signal results are placed on electrical interface component  1224  of the electrical component  1220 . In one example, the electrical interface component  1224  comprises an output of the electrical component  1220 . The processed electrical signal results are transferred to the electrical interface component  1210  on the die  102 . The processed electrical signal results are transferred to the electrical interface component  130  through the connection path  1206 . The electrical interface component  130  is mounted to the flexible support, compliant component  114 . In one example, electrical interface component  130  comprises a connection component for connection with the separate layer  310 .  
         [0054]    Referring to FIG. 15 in one example the die  102  and electrical component  1220  mount to a separate layer  310 . The die  102  comprises one or more electrical interface components  1510 ,  1512 ,  1514 ,  1516 ,  1518 ,  1520 ,  1522 ,  1524 ,  1526 ,  1528 ,  1530 ,  1532 ,  1534 ,  1536 ,  1538 , and  1540  to make connection to the respective electrical interface components  1550 ,  1552 ,  1554 ,  1556 ,  1558 ,  1560 ,  1562 ,  1564 ,  1566 ,  1568 ,  1570 ,  1572 ,  1574 ,  1576 ,  1578 , and  1580  of the separate layer  310 . In one example, the electrical interface component  1550  comprises an input of the electrical component  1220 . In another example, the electrical interface component  1550  comprises an output of the electrical component  1220 . In one example, the electrical interface component  1550  is connected to the electrical interface component  1592  through a connection path  1590 . The electrical interface component  1592  comprises one or more connections slots  1594  to electrically and physically attach to a separate component. The connection path  1590  in one example comprises a conducting path.  
         [0055]    Referring to FIGS.  12 - 15 , in one example, the electrical component  1220  is a separate chip. To integrate the electrical component  1220  to the die  102 , an electrical and mechanical connection is made between the electrical interface components  1208  of the die  102  and the electrical interface components  1222  of the electrical component  1220 . In one example, the electrical component  1220  electrically connects at the interfacing surface  180 . In another example, the electrical component  1220  electrically connects in a recess  1250  of the die  102 . The recess  1250  is designed so that the electrical component  1220  can rest in the recess  1250 . The depth of the recess  1250  is designed so that when the die  102  and the electrical component  1220  are connected to the separate layer  310  the electrical component  1220  is not obstructing the electrical interface component  1510  of the die  102  from making contact with the electrical interface component  1550  of the separate layer  310 .  
         [0056]    Referring to FIG. 14, in one example, the electrical components  1220  are completely integrated into the die  102  by designing the die  102  to include the electrical components  1220 . The one or more of the electrical signals generated by the die  102  are fed directly to the integrated electrical components  1220 .  
         [0057]    Referring to FIGS.  12 - 15 , having the electrical component  1220  within the periphery the die  102  creates a higher level of integration. Rather than having the electrical component  1220  and the die  102  use separate footprints, integrating them uses a single footprint on the separate layer  310 . Thus, saving space on the separate layer  310 .  
         [0058]    Having the electrical component  1220  integrated into the die  102  allows for testing of the electrical component  1220  and the die  102  together without complete installation to the separate layer  310 .  
         [0059]    Turning to FIG. 16, in one example, the attachment of the die  102  to the separate layer  310  is made with one or more of electrical interface components  1512 . Electrical interface component  1512  of the separate layer  310  is connected to the die  102  through the electrical interface component  1552 . In one example, the connection between the die  102  and the separate layer  310  is made through one or more solder balls. In one example, the solder ball is heated, centered, and cooled to complete the connection between layers. In one example, the solder ball is pressed together during the connection process, thus the solder ball is deformed from a spherical shape. The one or more solder balls electrically and mechanically connect the die  102  to the separate layer  310 . The one or more solder balls comprise a conductive material to electrically connect the die  102  to the separate layer  310 . The one or more solder balls comprise a bonding material to mechanically connect the die  102  to the separate layer  310 .  
         [0060]    One or more features described herein with respect to one or more of the compliant components  104 ,  106 ,  108 ,  110 ,  112 ,  114 ,  116 ,  118  in one example apply analogously to one or more other of the compliant components  104 ,  106 ,  108 ,  110 ,  112 ,  114 ,  116 ,  118 . One or more features described herein with respect to one or more of the electrical interface components  120 ,  122 ,  124 ,  126 ,  128 ,  130 ,  132 ,  134  in one example apply analogously to one or more other of the electrical interface components  120 ,  122 ,  124 ,  126 ,  128 ,  130 ,  132 ,  134 . One or more features described herein with respect to one or more of the connection paths  136 ,  138 ,  140 ,  142 ,  144 ,  146 ,  148  in one example apply analogously to one or more other of the connection paths  136 ,  138 ,  140 ,  142 ,  144 ,  146 ,  148 . One or more features described herein with respect to one or more of the notches  150 ,  152 ,  154 ,  156  in one example apply analogously to one or more other of the notches  150 ,  152 ,  154 ,  156 . One or more features described herein with respect to one or more of the electrical interface components  130 ,  1510 ,  1512 ,  1514 ,  1516 ,  1518 ,  1520 ,  1522 ,  1524 ,  1526 ,  1528 ,  1530 ,  1532 ,  1534 ,  1536 ,  1538 , and  1540  in one example apply analogously to one or more other of the electrical interface components  130 ,  1510 ,  1512 ,  1514 ,  1516 ,  1518 ,  1520 ,  1522 ,  1524 ,  1526 ,  1528 ,  1530 ,  1532 ,  1534 ,  1536 ,  1538 , and  1540 . One or more features described herein with respect to one or more of the electrical interface components  1550 ,  1552 ,  1554 ,  1556 ,  1558 ,  1560 ,  1562 ,  1564 ,  1566 ,  1568 ,  1570 ,  1572 ,  1574 ,  1576 ,  1578 , and  1580  in one example apply analogously to one or more other of the electrical interface components  1550 ,  1552 ,  1554 ,  1556 ,  1558 ,  1560 ,  1562 ,  1564 ,  1566 ,  1568 ,  1570 ,  1572 ,  1574 ,  1576 ,  1578 , and  1580 .  
         [0061]    The steps or operations described herein are just exemplary. There may be many variations to these steps or operations without departing from the sprit of the invention. For instance, the steps may be performed in a differing order, or steps may be added, deleted, or modified.  
         [0062]    Although exemplary implementations of the invention have been depicted and described in detail herein, it will be apparent to those skilled in the relevant art that various modifications, additions, substitutions, and the like can be make without departing from the sprit of the invention and these are therefore considered to be within the scope of the invention as defined in the following claims.