Fingerprint 2 Click Board™

How Does The Fingerprint 2 Click Board™ Work?

The Fingerprint 2 Click Board™ features an A-172-MRQ, a 2D capacitive fingerprint sensor with an active scanning area of 8.8 x 8x8 mm and a resolution of 176 x 176 pixels. The sensor is based on capacitive-contact technology with a hardened surface and enhanced ESD immunity. Onboard Nuvoton M2301 MCU which serves as interface IC and control unit on this board, interface this sensor over a high-speed SPI interface and comes with built-in fingerprint matching capability while leaving most of the chip resource to application developers. Developers can develop fingerprint-related products based on the communication protocol without the advanced knowledge of fingerprint identification.

The Fingerprint 2 Click Board™ has stable performance and a simple structure. The simplified functions for faster and easy development include fingerprint comparison, image scanning transmission, search, registered fingerprint storage and system unique internal code protection mechanism. The fingerprint comparison program can register at most 24 fingerprints, the comparison speed is fast and the correct rate is very high.

Thanks to the Nuvoton MCU with the on-chip crypto-accelerator, Cortex-M23 TrustZone, and XOM facilities that is communicating with the fingerprint sensor and providing information to the host, Fingerprint 2 Click board can be interfaced with commands over UART protocol (baud rate 115200) or USB 2.0 full speed.

For proper operation the Fingerprint 2 Click Board™ needs to be supplied with 3.3V and 5V. However, note that this board it is designed to be operated only with 3.3V logic levels. Therefore a proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with logic levels of 5V.

BYNEW QUICKICK UTILITY TOOL

For using and controlling the Fingerprint 2 Click Board™ with PC Application from ByNew you will need first to connect your board to PC by using USB or some TTL converter for UART. After that, you can start the Utility tool BNQuickick.exe and select the COM port and Baud rate to operate/control this board.

Since this application is simplifying testing our board and acts as MCU host you can use the same commands from the Fingerprint 2 Click Board™ example to control our board.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout on the Fingerprint 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Compare indicator	LD1	1	AN	PWM	16	GP2	General Purpose I/O pin
Reset	RST	2	RST	INT	15	LD2	Compare Indicator
General Purpose I/0 pin	GP1	3	CS	RX	14	TX	UART Transmit
NC	4	SCK	TX	13	RX	UART Receive
NC	5	MISO	SCL	12	NC
NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

ON BOARD LED'S

The red and green LEDs flash in turn:

• It indicates in the status of the received command from the master.

The red LED and the green LED is ON (light) at the same time:

• It is a temporary state, it will enter the registration state after two or three seconds.

The red LED flashes:

In the registration state, waiting for the user to enrol his fingerprint to register, it can register at most 24 fingerprints, each fingerprint needs to be enrolled 3 times. After each successful enrollment of the fingerprint, the green LED will light for two or three seconds.

The green LED flashes:

• In the registration state, waiting for the user to enrol his fingerprint to register, it can register at most 24 fingerprints, each fingerprint needs to be enrolled 3 times. After each successful enrollment of the fingerprint, the green LED will light for two or three seconds.

The red LED and the green LED flash twice in turn:

• It indicates the fingerprint image is uploading to master.