SW6888 Datasheet | Symwave

.. Fingerprint Sensor IC SW6888 Protective Coating user guide Version 0.1 Symwave, Inc 10180 Telesis Court, 3rd Floor San Diego, CA 92121 Phone: (858) 450-2845 Fax: (858) 453-1797 info@symwave. Symwave Technologies (Shenzhen) Co., Ltd. Rm. 401, #8 Building, Software Park, Ke-Ji-Zhong Rd. 2, Hi-Tech Industrial Park, Nanshan District, Shenzhen, P.R. China Phone: 86-755-26984500 Fax: 86-755-86168313 info@symwave..cn .. 1.0 Introduction Symwave Bio Print sensors are applied in a mechanically abrasive condition where finger print registration and matching are executed through physical swiping of a human finger on the Bio Print sensor surface. A special swiping surface was developed to withstand the ware and tare nature of finger print swiping. This layer also serves as a protect covering for the exposed die area from scratches and miss-handling. 2.0 Special Protective Coating for finger swiping. To ensure original die surface (Si O2+Ni) integrity is maintained and to extend the durability and reliability of Bio Print sensors during its life, all sensors are coated with a Symwave special protective coating layer (yellowish in color). This layer not only is used for serving as the application layer during finger swiping but also serves as a protective shielding against minor abrasive scratches to the die surface. The coating layer can withstand greater than 1M of repeated swipes of a human finger without any degradation of the finger capture image and sensor quality. Experiment results also showed the protective coating layer remains on the sensor surface after greater than 1.2M physical swipes. Original die surface coating of Si O2 (passivation) remains undisturbed after greater than 1.2M physical swipes. 2.1 Coating Condition and Quality Due to the nature of Bio Print sensor applications, the sensor area of the die is exposed for application used and thus, subject to potential physical abrasion on the coating surface. Fine...