Farpoint Group Technical Note — November 2008
Efficient use of platform resources – Fast match times are required while minimizing both proc- essor MIPS and memory footprint.
Standards-based interface using fingerprint minutia templates – As we noted elsewhere, stan- dards-based interfaces provide a design and operational flexibility. ISO 19794-2 templates can be stored on a SIM or other secure element and moved from one fingerprint phone to another.
Navigation and convenience features – A real plus in terms of both cost and physical real estate is for the fingerprint sensor to additionally act as a touch input device, providing the ability to navigate a user interface or access favorite destinations without typing. Haptic feedback is also desirable in highly-mobile devices, and we believe such will become very popular as display- optimizing touch user interfaces grow in popularity
“Integrating fingerprint recognition into mobile devices is a relatively straightforward task,” said Carl Temme, VP of Marketing at fingerprint-recognition component manufacturer Atrua Technologies, in an interview. “Only one, low-cost, active component is required. We provide all the embedded code re- quired for the mobile device including the signal-processing algorithms, standards-based minutia inter- faces, the common API for applications, and secure management of scanned data. And solutions are extremely cost-effective”.
A block diagram and illustration of the principle of operation for Atrua’s ATW300 Made-For-Mobile™ fin- gerprint sensor is shown in Figure 3. Note that the specifications of this device include optimization for a battery powered environment - standby power is only 2.6 uA, and the power required for active imaging (scanning) is only 1.4 mA.
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BUS CONTROLLER AND I/O BUFFERS
CONTROL AND STATUS REGISTERS
Figure 3: Implementation of fingerprint recognition hardware is relatively simple, thanks to robust VLSI-based vendor implementations and simple capacitive scanners. Interfacing requirements are on the order of those required for typical I/O devices. Source: Atrua Technologies.
Fingerprint Recognition and Mobile Security