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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.

SENSOR ARRAY

D[7:0]/SPI

INDEX REGISTER

A[0] CSn WRn RDn INTRn

BUS CONTROLLER AND I/O BUFFERS

CONTROL AND STATUS REGISTERS

TCLKIN

STATE CONTROLLER

ANALOG-TO-DIGITAL CONVERTER

FRAME BUFFERS

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

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