Specifications

Ultra Low power consumption 80mA
sleeping and wakeup control interfaces
live finger print detection
prevent fake fingerprints

The basic concept in fingerprint system

 

       The fingerprint features

 

       The fingerprint algorithm extracts features from fingerprint image. The store, match and search of fingerprint is operated by means of fingerprint features.

 

       1: 1 match

 

  Two fingerprint features are compares with each other. The return message is either match or no.

 

        1:N search

 

  From N fingerprints, get one fingerprint out of N fingerprints to compare with 1 given fingerprint feature. The return message is: no match or match and returning match feature number.

 

 Live finger validation

 

  In SM-628B fingerprint module, the function of live finger validation is designed on order to prevent fake fingerprints. The live fingerprint validation has two phase as 0 and 1. 0 is off; 1 is on. However, this function is sensitive to environment temperature, humidity and wetness of the finger.

In order to increase the robust of the system, and to prevent the un-sensitivity with fingerprint detection, it is recommended to search fingerprints one more without the live fingerprint validation in the same time. 

 

Technical parameters

 

No	Technical Items	Technical parameters	Test conditions
1	System power supply	4.5V-7V(DC)
2	Normal working current	<80mA	5V
3	Peak current	<100 mA	5V
4	Fingerprint entry time	< 100ms
5	1:1match time	< 400ms	Features extraction and fingerprint match
6	1:256 search time	< 2s
7	Fingerprint storage quantity	1024 (default) / 1776(customized)
8	FAR	< 0. 001 %
9	FRR	< 1.5 %
10	External interface	UART*
11	Module size	53.0 x 20.5 x 24.5mm
12	Size of fingerprint template	256bytes
13	Storage temperature	-40 degree to 85 degree
14	Working temperature	-20degree to 60 degree

 

* 1bit start bit, 8 bits data bit, 1bit stop bit Baud rate 57600bps