Abstract:
System for providing an open-cavity semiconductor package. The system includes a method for wire bonding a finger sensor die to an external circuit. The finger sensor die includes a sensor array having one or more die contacts that are wire bonded to one or more external contacts of the external circuit so that a usable portion of the sensor array is maximized. The method comprises steps of forming a ball at a first end of a bonding wire, forming an electrically conductive connection between the ball and a selected external contact of the external circuit, extending the bonding wire to a selected die contact so as to form a wire loop having a low loop height, and forming an electrically conductive stitch connection between a second end of the bonding wire and the selected die contact.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates to semiconductor devices, and more particularly, to a system for providing a fingerprint sensor with increased sensor accessibility.  
         BACKGROUND OF THE INVENTION  
         [0002]    Semiconductor devices are increasingly being used as input devices for digital systems. For example, in identification and security applications, semiconductor devices are used to provide user identification information. One such device is a semiconductor fingerprint sensor.  
           [0003]    [0003]FIG. 1 shows a portion of a typical semiconductor fingerprint sensor  100 . Generally, such a sensor is provided as an integrated circuit (IC). The sensor  100  includes a die (or wafer)  102  attached to a substrate  104  via an adhesive or epoxy bond  106 . A sensor surface  108  of the die  102  has a conductive grid, shown in detail at  110 , that is used to form a capacitive circuit to detect characteristics of a person&#39;s finger when the sensor surface is touched. The grid is coupled to a plurality of die contact members  112  at the surface of the die.  
           [0004]    A technique known as wire bonding is used to couple the die contact members  112  to substrate contacts  114  located on the substrate material, which is normally made up of metallic lead frame or build up layers of substrate. Typically, wire bonding involves attaching small wires (gold or aluminum) between two contact members. A capillary device, shown at  116 , is typically used to bond the wire between the contacts. When bonding the wire, the capillary device first forms a ball  118  at the end of a wire  120  by using an electronic flame-off (EFO) technique. Once the ball is formed, the capillary device attaches the ball  118  to a die contact pad  112  by a thermal-sonic process. In this process, the contact is heated and ultrasonic power is used to agitate the ball onto contact to flatten out the ball to form an inter-metallic weld between the ball and the contact, as shown at  122 .  
           [0005]    After the first weld is made, the capillary device  116  extends the wire  120  over to a substrate contact  114  to form a weld with that contact. To bond the wire to the substrate contact  114 , a stitch weld is formed. The stitch weld bonds the wire to the substrate contact and cuts the wire at the same time, so that the capillary device may form a new ball on a next portion of the wire and proceed to the next die contact. For example, a stitch weld is shown at  124 .  
           [0006]    The wire  126  shows the result of the wire bonding process described above. Because the wire extends in generally a vertical direction from the weld of the ball to the die contact, a wire loop is formed when the wire is extended to the substrate contact. The wire loop has a height above the surface of the die is shown at  128 . For standard wire bonding processes, this loop height is between six to ten thousandths (mils) of an inch high. As described in the following text, the loop height has an effect on the operation of finger sensor  100 .  
           [0007]    Once the wire bonding is completed and all bonding wires are installed, the device is protected by an encapsulation process in which a material, such as plastic, completely covers the bonded wires. For example, a molding process may be used where a material is molded around the device. Another process that may be used is referred to as “glob-top” dispensing, where material is dispensed onto the top of the device and allowed to flow around the sides and bottom of the device.  
           [0008]    [0008]FIG. 2 shows the finger sensor  100  after an encapsulation process is completed so that the bonding wires are completely protected by an encapsulation material  202 . However, for the finger sensor to operate, the sensor surface  108  is exposed by a cavity  204  in the encapsulation material to allow a person finger to come in contact with the sensor surface.  
           [0009]    To cover the bonding wires and still provide access to the sensor surface  108 , the cavity in the encapsulation material includes cavity walls  206  that are at least as high as the loop height of the bonding wires. The cavity walls form what is referred to as a pedestal that has a pedestal height, shown at  208 . Unfortunately, as a result of the pedestal height, portions of the sensor surface  108  may not be reachable by a person&#39;s finger. For example, the sensor surface regions shown at  210  and  212  may be inaccessible to a person&#39;s finger because it is not possible squeeze the finger into the corner formed by the sensor surface and the cavity wall.  
           [0010]    Finger sensors typically provide their best operation when a maximum number of grid points can be touched. However, due to the effects of the pedestal height, portions of the sensor grid are unreachable, and so, the performance of the sensor may be degraded. Another problem associated with convention fingerprint sensors is the package size. Typical fingerprint sensors have die contacts on either side of the sensor surface. This results in a very large package that may be unsuitable for use in portable applications.  
           [0011]    One way to overcome the above problems is to provide a larger cavity to account for the unreachable portions of the sensor surface. However, due to the geometry of the die, it may not be possible to provide a larger cavity without exposing portions of the die. Furthermore, even if a larger cavity were possible, the overall height of the encapsulation is undesirable because typical applications for finger sensors include portable devices, such as cell phones, that require the smallest possible size. For example, one conventional fingerprint sensor has approximate dimensions of 22×12×0.4 millimeters, which is a relative large package that is unsuitable for use in portable applications.  
           [0012]    Therefore, what is needed is a way to provide maximum access to a finger sensor surface while providing the smallest possible size to allow the device to be used in a variety of portable applications.  
         SUMMARY OF THE INVENTION  
         [0013]    The present invention includes a system for wire bonding a finger sensor die to an external circuit to provide maximum access to the finger sensor surface while providing the smallest possible size to allow the device to be used in a variety of portable applications. The system reduces the height of wire loops formed by bonding wires so that the pedestal height of the encapsulation is reduced. The reduced height of the pedestal provides greater access to the sensor surface. Thus, by providing greater access to the sensor surface, more sensor grid points are used to produce a sensor read-out, which results in more accurate sensor operation. The system is equally applicable to stationary finger sensors and sweep finger sensors. Furthermore, by reducing the encapsulation height, the overall device package is reduced in size. This results in cost savings, as well as, allowing the device to be integrated into a variety of small portable devices.  
           [0014]    In one embodiment of the present invention, a method for wire bonding a finger sensor die to an external circuit is provided. The finger sensor die includes a sensor array having one or more die contacts that are wire bonded to one or more external contacts of the external circuit so that a usable portion of the sensor array is maximized. The method comprises steps of forming a ball at a first end of a bonding wire, forming an electrically conductive connection between the ball and a selected external contact of the external circuit, extending the bonding wire to a selected die contact so as to form a wire loop having a low loop height, forming an electrically conductive stitch connection between a second end of the bonding wire and the selected die contact, and repeating the above steps until the one or more die contacts are wire bonded to the one or more external contacts of the external circuit.  
           [0015]    In another embodiment of the present invention, a portable fingerprint sensor device is provided. The device includes a finger sensor die that includes a sensor array having one or more die contacts that are wire bonded to one or more external contacts of an external circuit so that a usable portion of the sensor array is maximized. The device comprises bonding wires coupled between the die contacts and the external contacts, where the bonding wires form wire loops having very low loop heights above the sensor array surface. The device is encapsulated with an encapsulation material that forms a cavity around the sensor array to allow a person to touch the sensor array. As a result of the low height of the loop, the cavity forms a low height pedestal to allow a maximum amount of the sensor array to be accessible. In one or more variations, the cavity includes cavity walls that are stepped, sloped, and/or chamfered to provide even greater sensor surface access. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]    The foregoing aspects and the attendant advantages of this invention will become more readily apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings wherein:  
         [0017]    [0017]FIG. 1 shows typical electrical connections to a finger sensor die;  
         [0018]    [0018]FIG. 2 shows a typical encapsulated use with a finger sensor die;  
         [0019]    [0019]FIG. 3 shows one embodiment of a finger sensor die with wires bonded in accordance with the present invention;  
         [0020]    [0020]FIG. 4 shows the resulting encapsulation of the finger sensor die of FIG. 3;  
         [0021]    [0021]FIGS. 5 a - c  illustrate how encapsulation height affects lost sensor area;  
         [0022]    [0022]FIG. 6 shows a sweep finger sensor that illustrates lost sensor regions due to the height of the encapsulation pedestal;  
         [0023]    [0023]FIG. 7; shows a stationary finger sensor that illustrates lost sensor regions due to the height of the encapsulation pedestal;  
         [0024]    [0024]FIG. 8 shows a stepped encapsulation constructed in accordance with the present invention; and  
         [0025]    [0025]FIG. 9 shows a sloped encapsulation constructed in accordance with the present invention;  
         [0026]    [0026]FIG. 10 shows a fingerprint sensor with chamfered encapsulation portions constructed in accordance with the present invention;  
         [0027]    [0027]FIG. 11 shows a sweep-type fingerprint sensor with a chamfered encapsulation constructed in accordance with the present invention;  
         [0028]    [0028]FIGS. 12 a - d  show top, bottom, side, and isometric views of an exemplary fingerprint sensor constructed in accordance with the present invention;  
         [0029]    [0029]FIG. 13 shows one embodiment of a fingerprint sensor die with ball compensators placed on the die contacts to compensate for die misalignments;  
         [0030]    [0030]FIG. 14 shows the fingerprint sensor die of FIG. 13 with bonding wires attached in accordance with the present invention; and  
         [0031]    [0031]FIG. 15 shows a PDA and a portable mobile telephone with fingerprint sensors constructed in accordance with the present invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0032]    The present invention includes a system for bonding wires to a finger sensor die to provide maximum access to a finger sensor surface while providing the smallest possible size. The system reduces the height of wire loops formed by bonding wires so that the pedestal height of the encapsulation material is reduced. Thus, various embodiments of the system included in the present invention are discussed in detail in the following text.  
         [0033]    Exemplary Embodiment  
         [0034]    [0034]FIG. 3 shows one embodiment of a finger sensor die  300  with wires bonded between die contacts  302  and substrate contacts  304  in accordance with the present invention. Bonding wires  306 ,  308  are shown having very low loop heights  310  in accordance with the present invention.  
         [0035]    To form the wire bonds as shown in FIG. 3, the capillary device  312  forms a ball at the end of a bonding wire  314  and this ball is welded to one of the substrate contacts  304 . The wire  314  is then extended to a die contact where a stitch weld is created to weld the bonding wire to the die contact. Thus, the welding process is reversed from conventional practices, however, the result is significant because the loop height  310  of the bonded wire is greatly reduced when compared to a conventionally bonded wire. This result is possible because a portion of the bonded wire that extends vertically from the ball weld is below the sensor surface  316 , thereby allowing the wire to be extended to the die contact  302  while forming a loop having a very low loop height. Using this process, it is possible to achieve loop heights in the range of 1-2 mils, which is much less than the loop height created by conventional bonding techniques.  
         [0036]    [0036]FIG. 4 shows the resulting encapsulation of the finger sensor die  300  of FIG. 3. The encapsulation material  402  covers the bonded wires and provides a cavity  404  allowing the finger sensor to be accessed by a user. The cavity  404  is formed by a pedestal of encapsulation material having a pedestal height  406  that is very low as a result of the low loop height of the bonded wires. Thus, very small regions  408 ,  410  of the sensor  316  are inaccessible due to the low pedestal height.  
         [0037]    Sensor Surface Recovery  
         [0038]    One or more embodiments included in the present invention operate to increase access to portions of the sensor surface over conventional systems. For example, the amount of lost sensor surface, and corresponding sensor grid points, can be computed for a given sensor type, sensor density and pedestal height.  
         [0039]    [0039]FIGS. 5 a - c  illustrate how encapsulation height affects lost sensor area of a sweep-type finger sensor. FIG. 5 a  shows a portion of a sweep sensor die  502  having a sensor surface  504  and encapsulation portion  506  that covers bonding wires attached to the die  502 . A user&#39;s finger  508  is shown as it sweeps across the sensor surface  504 . Because of the height  510  of the encapsulation portion  506 , a portion of the sensor surface indicated at  512 , is unable to be touched by the user&#39;s finger. Thus, this portion  512  does not contribute information about the user&#39;s finger at the output of the sensor, which results in a corresponding decrease in sensor performance.  
         [0040]    [0040]FIGS. 5 b  and  5   c  show the sweep sensor die  502  with encapsulation portion  506  having varying heights and the corresponding effects on accessible sensor surface area. FIG. 5 b  shows the encapsulation portion  506  having height  514  that is less than the height  510 . The resulting lost sensor surface  516  is less than the loss sensor surface indicated at  512 . FIG. 5 c  shows the encapsulation portion  506  having height  518  that is less than the height  516 . The resulting lost sensor surface  520  is less than the loss sensor surface indicated at  516 . Thus, lower encapsulation pedestal heights result in more sensor surface area being accessible by a user. The lower encapsulation heights are achieved when bonding wires are attached in accordance with the invention.  
         [0041]    [0041]FIG. 6 shows a portion of a sweep-type finger sensor  600  constructed in accordance with one embodiment of the present invention. The sweep-type fingerprint sensor obtains a reading when a user sweeps a finger across the sensor surface in a selected direction. The sweep-type finger sensor has its die contacts  620  moved from the ends of the sensor array to a position that is parallel to a side of sensor array, so that the die contacts line along a line that is perpendicular to the sweep direction. This arrangement results in a much smaller sensor device, however, it requires the encapsulation height to be very small or a significant portion of the sensor array will be inaccessible. Thus, wire bonding in accordance with the present invention is required to make such an arrangement practical.  
         [0042]    The sensor  600  includes a die  602  that has a sensor surface  604 . The sensor surface  604  includes grid points or sensor pixels  606  that form rows and columns of a sensor array. For this particular sensor, the distance between sensor pixels, referred to as the pitch size, will be assumed to be approximately 50 microns. The sensor  600  also includes a pedestal portion  608  formed during an encapsulation process that includes a cavity wall  610 . The pedestal has a height (H) above the sensor surface  604 , as shown.  
         [0043]    During operation, a user sweeps a finger across the sensor surface  604  in a direction indicated by arrow  612 . Because of the height (H) of the pedestal, a portion of the sensor surface within a certain distance (P x ) from the cavity wall  610  will not be touched by the user&#39;s finger. This untouched portion is indicated at  614 , and pixels within this region will not contribute any information to the sensor read-out during the finger sweep.  
         [0044]    For the sweep finger sensor  600 , the lost sensor distance (P x ) due to the pedestal height (H) can be expressed as:  
         
       P 
       x 
       =H×SwLF  
     
         [0045]    where SwLF is a sweep loss factor associated with a sweep finger sensor, and has a value of approximately 3.2. Thus, for a sweep sensor with conventional wire bonding and having a pedestal height of 300 um (approximately 11.8 mils), the lost sensor distance is approximately 960 um. With a sensor pitch of 50 microns, this lost sensor distance corresponds to a loss of approximately 19 rows of sensor pixels. However, in a sweep sensor with wires bonded in accordance with the present invention, a pedestal height of 38 um (approximately 1.5 mils) can be achieved, which results in a lost sensor distance (P x ) of 121 um. Thus, with a 50-micron sensor pitch, approximately 3 rows of sensor pixels will be lost. Thus, shown how wire bonding in accordance with the invention facilitates the die contact arrangement that is perpendicular to the sweep direction.  
         [0046]    [0046]FIG. 7 shows a portion of a stationary-type finger sensor  700 . The sensor  700  includes a die  702  that has a sensor surface  704 . The sensor surface  704  includes grid points or sensor pixels that form rows and columns of a sensor array. For this particular sensor, the pitch size will be assumed to be approximately 50 microns. The sensor  700  also includes pedestal portions  708  and  710  that are formed during an encapsulation process. The pedestal portion  708  includes a cavity wall  712 , and the portion  710  includes a cavity wall not visible in FIG. 7. Both pedestal portions have a height (H) above the sensor surface  704 , as shown.  
         [0047]    During operation, a user places a finger on the sensor surface  704 . Because of the height (H) of the pedestal portions, two portions of the sensor surface  704  within a certain distance from the pedestal walls will not be touched by the user&#39;s finger. These portions have distances indicated at  714  and  716 . Sensor pixels within these regions will not contribute any information to the sensor read-out.  
         [0048]    For the stationary sensor  700 , having two pedestals, the lost sensor distance P x  can be expressed as:  
           P   x =2×( H×SLF )  
         [0049]    where SLF is a loss factor for a stationary sensor, and has a value of approximately 1.8. Thus, for a stationary-type sensor having a pedestal height of 300 um (approximately 11.8 mils), the lost sensor distance is approximately 1080 um. With a sensor pitch of 50 microns, this lost sensor distance corresponds to a loss of approximately 22 rows of sensor pixels. However, in a finger sensor with wires bonded in accordance with the present invention, a pedestal height of 38 um (approximately 1.5 mils) can be achieved, and results in a lost sensor distance (P x ) of approximately 137 um. Thus, with a 50-micron sensor pitch, approximately 3 rows of sensor pixels will be lost.  
         [0050]    Therefore, finger sensors having wires bonded in accordance with the present invention result in low wire loop heights that translate to lower encapsulation pedestals. The lower pedestals allow more of the sensor surface to be accessible to a user&#39;s touch, and so, sensors having wires bonded in this fashion are able to utilize more of the sensor array to produce more accurate read-outs than conventionally bonded finger sensors. By providing access to more of the sensor surface, wire bonding in accordance with the present invention allows the use of smaller finger sensors in application that require small sensors, such as in portable cell phone applications and other mobile portable devices.  
         [0051]    Cost Savings  
         [0052]    As described above, reducing the encapsulation height results in more usable sensor area. Thus, by reducing the amount of lost sensor area, smaller sensors having less material can be produced. For example, less sensor and encapsulation material is required. Given the potential for high volumes of manufactured fingerprint sensors, a huge cost savings can be realized.  
         [0053]    Additional Embodiments  
         [0054]    The following is a description of alternative embodiments included in the present invention to further reduce pedestal height, and thereby, result in even smaller finger sensors.  
         [0055]    [0055]FIG. 8 shows a stationary-type finger sensor die  802  with stepped encapsulation portions  804  constructed in accordance with the present invention. The die  802  includes bonding wires  808  that are stitch welded to die contacts  806  in accordance with the present invention. Thus, the bonding wires form wire loops (not shown) having low loop heights as described above.  
         [0056]    The sensor die  802  includes a sensor surface  810  that is used to sense characteristics of a user&#39;s fingerprint, such as small ridges and valleys that are referred to as the minutiae. The stepped encapsulation  804  covers the wire loops formed by the bonding wires so that a maximum encapsulation height  812  above the sensor surface  810  can be defined. As described above, this maximum encapsulation height is greatly reduced compared to conventional sensors as a result of the wire bonding techniques included in the present invention. However, as will be described, the stepped encapsulation makes it possible to effectively reduce the encapsulation height even more to provide greater access to the sensor surface  810 .  
         [0057]    The stepped encapsulation  804  forms a stair step structure that generally follows the profile of the bonding wires  808  as they extend to the die contacts  806 . A last step structure  814  occurs closest to the sensor surface so that a step height, as indicated at  816 , above the sensor surface  810  is minimized. The effect of the small step height is to provide the greatest access to the sensor surface. For example, as a result of the small step height, regions of the sensor surface that are inaccessible, shown at  818  and  820 , are minimized. Therefore, using the stepped encapsulation  804  it is possible to further reduce pedestal height to increase a user&#39;s access to the sensor surface.  
         [0058]    [0058]FIG. 9 shows a stationary-type finger sensor die  902  with a sloped encapsulation portion  904  constructed in accordance with the present invention. The die  902  includes bonding wires  908  that are stitch welded to die contacts  906  in accordance with the present invention. Thus, the bonding wires form wire loops (not shown) having low loop heights as described above.  
         [0059]    The sensor die  902  includes a sensor surface  910  that is used to sense characteristics of a user&#39;s finger. The slopped encapsulation  904  covers the wire loops formed by the bonding wires so that a maximum encapsulation height  912  above the sensor surface  910  can be defined. As described above, this maximum encapsulation height is greatly reduced compared to conventional sensors as a result of the wire bonding techniques included in the present invention. However, as will be described, the stepped encapsulation makes it possible to effectively reduce the encapsulation height even more to provide greater access to the sensor surface  910 .  
         [0060]    The sloped encapsulation portion  904  is sloped to cover the bonding wires yet provide the lowest encapsulation height possible to allow the greatest access to the sensor surface. As a result, inaccessible regions of the sensor surface  914 ,  916  are minimized. To achieve this result, a slope angle (a) is selected so that encapsulation portion  904  covers the bonding wires and die contacts, yet allows the encapsulation to form the largest cavity possible around the die surface  910 . Any desired slope angle may be selected that allows the encapsulation to provided the desired protection.  
         [0061]    The stepped and sloped encapsulation techniques described herein are equally applicable to stationary-type and sweep-type finger sensors. Therefore, by providing wire bonding in accordance with the present invention, combined with either of the above described encapsulation techniques, a finger sensor can be achieved having limited regions that are inaccessible while comprising a very small overall package that can readily be used in a variety of portable applications.  
         [0062]    [0062]FIG. 10 shows a fingerprint sensor  1000  with chamfered encapsulation portions constructed in accordance with the present invention. For example, the fingerprint sensor  1000  includes encapsulation material  1002  that forms a cavity  1004 . At the edge of the cavity walls, the encapsulation material is chamfered as show at  1006 .  
         [0063]    The fingerprint sensor  1000  includes bonding wires  1008  that are bonded in accordance with the present invention to have a low loop height to result in a low encapsulation pedestal. This encapsulation pedestal has a height shown by  1010 . However, the chamfer regions  1006  operate to further reduce the pedestal height so that the effective pedestal height is shown at  1012 . This reduced pedestal height results in small inaccessible sensor array regions  1014 ,  1016  that are smaller as a result of the chamfer  1006  than they would be without the chamfer.  
         [0064]    Additional chamfer regions  1018  are provided to further reduce the overall size of the fingerprint sensor package. Thus, the chamfer regions operate in conjunction with the low height bonding wires to increase the amount of usable sensor array and reduce the overall package size of the device.  
         [0065]    [0065]FIG. 11 shows a sweep-type fingerprint sensor  1100  with a chamfered encapsulation constructed in accordance with the present invention. The chamfer portion  1102  results in an effective pedestal height shown  1104 , which translates into an inaccessible sensor region as defined by  1106 . This region is determined from the above-described embodiments, however, the chamfer portion  1102  operates to produce a smaller inaccessible region than if the chamfer  1102  was not used. For example, without chamfer  1102  the pedestal height shown at  1108  would be used to determine the inaccessible region of the sensor surface, which would be large than the region defined by  1106 . Thus, the chamfer operates to increase usable sensor area.  
         [0066]    [0066]FIGS. 12 a - d  show top, bottom, side, and isometric views of an exemplary fingerprint sensor  1200  constructed in accordance with the present invention. The fingerprint sensor  1200  is representative of a fine pitch ball grid array (FBGA) sensor.  
         [0067]    [0067]FIG. 12 a  shows a top view of the sensor  1200  and provides dimensions in millimeters (mm). Because the fingerprint sensor  1200  utilizes wire bonding in accordance with the present invention, the overall size of the sensor is greatly reduced as compared to conventional sensors. For example, the width of the sensor  1200  is approximately 4.3 mm as compared to a conventional fingerprint sensor that has a width of approximately 12-13 mm, and therefore would be four times wider.  
         [0068]    [0068]FIG. 12 b  shows a bottom view of the fingerprint sensor  1200  and illustrates a ball grid array that is used to electrically interface to the sensor. FIG. 12 c  shows a side view of the sensor  1200  and illustrates how providing wire bonding in accordance with the present invention results in a low encapsulation pedestal height. For example, an encapsulation height of 0.07 mm is achieved by the sensor  1200 , which is far less than conventional sensors that have encapsulation heights of approximately 0.4 mm. Lastly, FIG. 12 d  shows an isometric view of the sensor  1200 .  
         [0069]    [0069]FIG. 13 shows one embodiment of a fingerprint sensor die  1300  with ball compensators  1302  placed on the die contacts to compensate for die misalignments. For example, as shown in FIG. 13, the die  1300  is misaligned on the substrate  1304  due to variations at the epoxy boundary  1306 . As a result, the height of the die above the substrate is uneven. For example, the height shown at  1308  is greater than the height shown at  1310 .  
         [0070]    To compensate for the die height differences, compensator balls  1302  are placed on each die contact prior to the wire bonding process. For example, the capillary device  1312  forms a ball  1314  at the end of a wire  1316  and deposits the ball at a selected die contact. This process is repeated for each die contact. The compensator balls  1302  are then used during the wire bonding process to compensate for the die height variations.  
         [0071]    [0071]FIG. 14 shows the fingerprint sensor die  1300  of FIG. 13 with bonding wires  1402  attached in accordance with the present invention. The bonding wires are coupled to the die  1300  via the compensators balls  1302 . The compensator balls  1302  allow some variation in the coupling of the bonding wires to the die contacts. As a result, the variation of the die height due to the epoxy boundary  1306  is compensated for, and the bonding wires  1402  form wire loops having very low loop heights  1404  in accordance with the present invention. Thus, the compensator balls  1302  operate to compensate for die misalignments while still providing for wire bonding in accordance with the present invention.  
         [0072]    [0072]FIG. 15 shows a personal digital assistant (PDA)  1502  and a portable mobile telephone  1504  with integrated fingerprint sensors constructed in accordance with the present invention. Because of the small size of the fingerprint sensors, their incorporation into a variety of small portable devices is possible, whereas, the incorporation of larger conventional sensors would not be possible.  
         [0073]    In one embodiment, a fingerprint sensor in incorporated into a side portion of the PDA  1502  as shown at  1506 . In another embodiment, a fingerprint sensor is incorporated into a front portion of the PDA  1502 , as shown at  1508 . In still another embodiment, a finger sensor is incorporated into keypad portion of the telephone  1504 , as shown at  1510 . Thus, because of the small package size achieved by wire bonding in accordance with the present invention, it is possible to incorporate a fingerprint sensor into a variety of small portable devices.  
         [0074]    The present invention includes a system for wire bonding a finger sensor die to an external circuit to provide maximum access to the finger sensor surface while providing the smallest possible size to allow the device to be used in a variety of portable applications. The embodiments described above are illustrative of the present invention and are not intended to limit the scope of the invention to the particular embodiments described. Accordingly, while one or more embodiments of the invention have been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit or essential characteristics thereof. Accordingly, the disclosures and descriptions herein are intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.