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Features
• • • • • • • • • •
Module Size: 55 x 72 mm (Smaller than Smart Card) Microcontroller: Atmel ARM9®-based AT91RM9200 SDRAM: 128 Mbits Flash: Atmel DataFlash® 32 Mbits Fingerprint Sensor: Atmel FingerChip® AT77C101B-CB02V Operating Temperature Range: -30° C to +65° C Operating Voltage: 3.3V ±10% Power Consumption: 200 mA in Typical Conditions Operating System: Linux® (Kernel 2.4.19) Available interfaces on Extension Connector: – Drivers Provided for SPI, Ethernet, Serial DBGU – Drivers not Provided for USB Host and Device, TWI, RS-485, IrDA, SmartCard, MMC/SD Card, SSC, RTC, JTAG… • Software Suite with Embedded Pre-loaded Bio-engine
FingerChip® Biometric Module
AT77SM0101BCB02VKE
Description
This document describes the specifications of Atmel's AT77SM0101BCB02VKE FingerChip biometric module. Based on Atmel's FingerChip fingerprint sensor, ARM9 microcontroller and flash memory, the AT77SM0101BCB02VKE provides the main biometric functions such as user enrollment, authentication and identification in a packaged module, making it easy to integrate into a final system. The AT77SM0101BCB02VKE is particularly well-suited to Physical Access Control, Point of Sale devices, Time and Attendance or Vending Machines. The AT77SM0101BCB02VKE provides great flexibility because of its memory capacity and powerful microcontroller loaded with the Linux operating system, and features many possible interfaces, including Ethernet. The AT77SM0101BCB02VKE biometric m o d u l e r e q u i r e s t h e p u r c h a s e o f t h e E v a l u a t i o n / D e ve l o p m e n t K i t AT77SM0101BCB02VEK to develop the user interface of the final application.
Applications
• • • • • • • Physical Access Control Time and Attendance Systems Automated Teller Machines, Points of Sale Vending Machines Smart Homes Locks, Safes Reference Design for ARM9 and FingerChip Design Development
Figure 1. FingerChip Biometric Module AT77SM0101BCB02VKE
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Functional Description
The AT77SM0101BCB02VKE is a biometric sub-system based on Atmel’s FingerChip fingerprint sensor. It comprises a fingerprint sensor connected to a board that embeds processing capabilities through an ARM9-based AT91RM9200 microprocessor, and memory to store the software and fingerprint templates. The biometric module must be connected to a motherboard for power supplies and interface connections. Connection to the motherboard is achieved through two standard connectors located on the sides of the module board. The module is loaded with a Linux operating system, an Atmel driver for the FingerChip sensor, and by default, authentication software (biometric library) for extraction of fingerprint characteristics and comparison with enrolled templates (also called bio-engine). The standalone module can perform the following: • • Enrollment: an operation where the end-user scans his fingerprint by sweeping it across the FingerChip sensor, providing a fingerprint signature reference (template) Authentication: accurate matching of the newly acquired fingerprint against the template stored in the board’s memory during the enrollment procedure, used to validate user authentication Identification: matching of the fingerprint image against the correct template within a database of previously acquired templates
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These three functions can then be used in any application requiring authentication to grant rights to a user, or to change criteria of the user’s profile. Examples of typical applications might include physical access control or time and attendance monitoring. The AT77SM0101BCB02VEK Evaluation Kit provides all the tools necessary for easy development of a customized application using the biometric module APIs. The AT77SM0101BCB02VKE biometric module lets you add convenient and secured user authentication to your products in a surprisingly reduced development time. Figure 2. AT77SM0101BCB02VKE Block Diagram
Motherboard
Linear Regulator
3.3V
Connectors
3.3V
GPIOS 1.8V 32-bit Data Bus
Interfaces
SDRAM 16 MB
SPI AT91RM9200
Flash 4 MB
8 Bits
Control
AT77C101B-CB02V
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Technical Description
Module Size and Length of Flex
Atmel’s FingerChip biometric module includes the AT77C101B-CB02V FingerChip sensor (8-bit parallel interface) connected through a flex cable to the module itself. The board size of the module is 55 mm x 72 mm. It has three screw holes for easy fixing to the motherboard or casing of the final system. The flexible cable is 5 cm long. It is a single straight cable made of copper. Figure 3. AT77SM0101BCB02VKE Board Dimensions 55 mm
50 mm 26.6 mm 72 mm
9.85 mm
The dimensions of the sensor are 26.6 mm x 9.85 mm x 2.6 mm for the PCB. The die size is 1.7 mm x 17.3 mm.
Description of Motherboard Interface
Figure 4. Motherboard Interface
1
1
2
49
50
49
50
2
3
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Table 1. J1 Pin Description
Pin 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Note: Description GND NBS3 PC10 PC11 PC12 PC14* PC1 PC2 PC4 PC6 PA0/MISO PA1/MOSI PA2/SPCK PA4/NPCS1 PA5/NPCS2 PA6/NPCS3 PA7/EREFCK PA8/ETXEN PA9/ETX0 PA10/ETX1 PA11/ECRSDV PA12/ERX0 PA13/ERX1 PA14/ERXER 3V3 Pin 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 Description 3V3 NBS1 NRD_NOE_NCFOE NWR0_NWE_NCFWE NCS3_NSMCS PC15* PC0* PC3 PC5 PA15/EMDC PA16/EMDIO PA17/TXD0 PA18/RXD0 PA19/SCK0 PA20/CTS0 PA21/RTS0 PA22 PA23/IRQ3 PA24 PA25/TWD PA26/TWCK PA29 PA28 PA27 GND
Pins 11, 12 and 14: do not use when the AT77C101B is connected to the module.
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Table 2. J2 Pin Description
Pin 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Description GND PB22 PB19 PB18 PB17 PB16 PB15 PB14 PB13 PB12 PB11 PB10 PB9 PB8 PB7 PB6 PB5 PB4 PB3 PB2 PB1 PB0 PA31 PA30 3V3 Pin 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 Description 3V3 PC9 PC8 PC7 DDP DDM HDPA HDMA PB29/IRQ0 PB28/FIQ PB27 PB26 PB25 PB24 PB23 NRST NTRST TMS TCK TDO TDI JTAGSEL PB21 PB20 GND
The pins are used to connect the following interfaces: • • • • • • • USB device: pins 10 and 12 of J2 connector USB host: pins 14 and 16 of J2 connector TWI: pins 40 and 42 of J1 connector JTAG: pins 32, 34, 36, 38, 40, 42 and 44 of J2 connector SPI: pins 21, 23, 25, 27, 29 and 31 of J1 connector Two serial links: RS-232, RS-485, IrDA and/or Smart Card Ethernet or MMC/SD card
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Board’s Main Components
ARM9-based AT91RM9200 Microcontroller The AT91RM9200 microcontroller features the following: • • • • • • • • 200 MIPS capability 16 KB data cache 16 KB instruction cache 16 KB SRAM ROM boot Ethernet MAC USB 2.0 full-speed host and device USART, DMA, TWI, SPI, SSC, MCI
The ARM9 operates at 200 MHz on the module. Memory The AT77SM0101BCB02VKE biometric module features: • • AT77C101B-CB02V Sensor 128 Mbits (16 Mbytes) of SDRAM on a 32-bit parallel data bus interface operating at 66 MHz 32 Mbits (4 Mbytes) of Atmel DataFlash on an SPI bus operating at 10 MHz
The sensor has the following characteristics: • • • • • • • • A sensitive layer over a 0.8 µm CMOS array An image zone of 0.4 × 14 mm, equalling 0.02 in. × 0.55 in. An image array of 8 × 280, equalling 2240 pixels A pixel pitch of 50 µm × 50 µm, equalling 500 dots-per-inch resolution A pixel clock of up to 2 MHz with a capacity of up to 1780 frames per second A die size of 1.7 × 17.3 mm An operating voltage range of 3V to 5.5V A natural protection from electrostatic discharge (ESD) up to 16 kV of air discharge. Use of metal casing or metalized plastic in the final application is strongly recommended A power consumption of 20 mW at 3.3V, 1 MHz, 25°C An operating temperature range of -40°C to +85°C A strong resistance to abrasion with the capability to withstand over 1 million finger sweeps A sweep speed ranging from 2 cm/s to 20 cm/s A low power consumption of 6 mA typical in acquisition mode and 10 µA in standby mode
• • • • •
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Storage Capacity
Figure 5. RAM Memory Mapping
16 MB RAM
Used by Ramdisk
Kernel Code
Used by Kernel
Free
6 MB
Figure 6. DataFlash Memory Mapping
1.5 MB
4 MB
4.5 MB
4 MB DataFlash 16 kB Compressed Kernel 700 kB Compressed Ramdisk AT77SM0101BCB02VKE Compressed Ramdisk < 2 MB 3 MB
Templates Database Storage
300 kB
Biometric Performances
The device’s biometric performances are characterized by the following: • • • • • • • • An image size of 500 × 400 256 levels of grey A finger swiping speed from 2 to 15 cm/s An FRR under 3% at an FAR 10-4 rate using an IKENDI® algorithm An authentication time of under 10 ms A biometric template size of 384 bytes An authentication algorithm size of 420 kbytes An identification time of under 1 second for 50 templates
Software
Operating System Driver Modules The biometric module comes preloaded with the Linux operating system (kernel 2.4.19 rmk 7). The kernel includes: • • • • • Ramdisk support A serial port driver supporting DBGU and up to four UARTs An SPI driver Ethernet layers 10/100 Mbits (compatible with MII protocol) Watchdog support
Further information can be retrieved at http://www.arm.linux.org.uk. 7
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Two drivers are provided as modules that can be loaded or unloaded during runtime. These are: • • The FingerChip driver: FingerChip_mod.o, version 2.0 enabling on-the-fly reconstruction of images A GPIOs driver: Leds_mod.o, version 2.0, used to drive switches, LEDS etc.
Environmental Specifications
Operating Conditions Absolute Maximum Ratings*
*NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device
