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1. Features

• Sensitive Layer Over a 0.35 µm CMOS Array

• Image Zone: 0.4 x 14 mm = 0.02" x 0.55"

• Image Array: 8 x 280 = 2240 pixels

• Pixel Pitch: 50 µm x 50 µm = 500 dpi

• Pixel Clock: up to 2 MHz Enabling up to 1780 Frames per Second

• Die Size: 1.64 x 17.46 mm

• Operating Voltage: 3V to 3.6V

• Naturally Protected Against ESD: > 16 kV Air Discharge

• Power Consumption: 16 mW at 3.3V, 1 MHz, 25°C

• Operating Temperature Range: -40°C to +85°C

• Chip-on-Board (COB), Chip-on-Board (COB) with Connector

• Complies With the European Directive for Restriction of Hazardous Substances

(RoHS Directive)

2. Applications

• PDA (Access Control, Data Protection)

• Notebook, PC-add on (Access Control, e-business)

• PIN Code Replacement

• Automated Teller Machines, POS

• Building Access

• Electronic Keys (Cars, Home)

• Portable Fingerprint Imaging for Law Enforcement

• TV Access

Figure 2-1. FingerChip

Packages

Chip-on-board Package

with Connector

Chip-on-board Package

(COB)

Actual size

Thermal

Fingerprint

Sensor with

0.4 mm x 14 mm

(0.02" x 0.55")

Sensing Area

and

Digital Output

(On-chip ADC)

AT77C102B

FingerChip

Rev. 5364A–BIOM–09/05

Summary of content (19 pages)

PAGE 1
. Features • • • • • • • • • • • • Sensitive Layer Over a 0.35 µm CMOS Array Image Zone: 0.4 x 14 mm = 0.02" x 0.55" Image Array: 8 x 280 = 2240 pixels Pixel Pitch: 50 µm x 50 µm = 500 dpi Pixel Clock: up to 2 MHz Enabling up to 1780 Frames per Second Die Size: 1.64 x 17.46 mm Operating Voltage: 3V to 3.6V Naturally Protected Against ESD: > 16 kV Air Discharge Power Consumption: 16 mW at 3.
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Table 2-1.
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AT77C102B Table 2-2.
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Figure 2-2. COB with Flex(1) Flex with metallizations up Flex with metallizations down Figure 2-3. Flex Output Side Flex Output (FingerChip Connector Side) Metallizations Up 1 3 2 Note: 4 1. Flex is not provided by Atmel.
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AT77C102B 3. Description The AT77C102B is part of the Atmel FingerChip monolithic fingerprint sensor family for which no optics, no prism and no light source are required. The AT77C102B is a single-chip, high-performance, low-cost sensor based on temperature physical effects for fingerprint sensing. The AT77C102B has a linear shape, which captures a fingerprint image by sweeping the finger across the sensing area.
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Table 3-3. Resistance Parameter Min Value Standard Method On pins. HBM (Human Body Model) CMOS I/O 2 kV MIL-STD-883 - method 3015.7 On die surface (Zapgun) Air discharge ±16 kV NF EN 6100-4-2 200 000 MIL E 12397B 4 hours Internal method ESD Mechanical Abrasion Number of cycles without lubricant multiply by an estimated factor of 20 for correlation with a real finger Chemical Resistance Cleaning agent, acid, grease, alcohol, diluted acetone Table 3-4.
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AT77C102B . Table 3-6. 3.3V Power supply The following characteristics are applicable to the operating temperature -40°C ≤ Ta ≤ +85°C Typical conditions are: VCC = +3.3 V; Tamb = 25°C; FPCLK = 1 MHz; Duty cycle = 50% Cload 120 pF on digital outputs, analog outputs disconnected unless otherwise specified Parameter Symbol Test Level Min Typ Max Unit 3.0 3.3 3.
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. Table 3-7. Switching Performances The following characteristics are applicable to the operating temperature -40°C ≤ Ta ≤ +85°C Typical conditions are: nominal voltage; Tamb = 25°C; FPCLK = 1 MHz; Duty cycle = 50% Cload 120 pF on digital and analog outputs unless otherwise specified Parameter Symbol Test Level Min Typ Max Unit Clock frequency fPCLK I 0.
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AT77C102B Figure 3-2. Read One Byte/Two Pixels fPCLK tLCLK tHCLK Clock PCLK Acknowledge ACKN tPLHACKN Data output Do0-3, De0-3 Video analog output AVO, AVE tPHLACKN Data #N-1 Data #N Data #N+1 Data #N Data #N+1 t PDATA Data #N+2 tPAVIDEO Figure 3-3.
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Figure 3-4. No Data Change tNOOE PCLK OE Note: OE must not change during TNOOE after the PCLK falls. This is to ensure that the output drivers of the data are not driving current, so as to reduce the noise level on the power supply. Figure 3-5. AT77C102B Block Diagram Clock PCLK ACKN Reset RST Line sel Column selection Even 1 dummy column 1 8 lines of 280 columns of pixels TPP 3.
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AT77C102B Figure 3-6. Functional Description 1 2 Column selection 3 Line sel 8 lines of 280 columns of pixels Even 4-bit ADC 4 4 De0-3 8 latches Amp 8 1 dummy column Odd 4-bit ADC Do0-3 4 Chip temperature sensor 3.2 Sensor Each pixel is a sensor in itself. The sensor detects a temperature difference between the beginning of an acquisition and the reading of the information: this is the integration time. The integration time begins with a reset of the pixel to a predefined initial state.
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3.5 Reading the Frames A frame consists of 280 true columns plus one dummy column of eight pixels. As two pixels are output at a time, a system must send 281 x 4 = 1124 clock pulses to read one frame. Reset must be low when reading the frames. 3.6 Read One Byte/Output Enable The clock is taken into account on its falling edge and data is output on its rising edge. For each clock pulse, after the start sequence, a new byte is output on the Do0-3 and De0-3 pins.
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AT77C102B 3.10 Synchronization: The Dummy Column A dummy column has been added to the sensor to act as a specific pattern to detect the first pixel. Therefore, 280 true columns plus one dummy column are read for each frame. The four bytes of the dummy column contain a fixed pattern on the first two bytes, and temperature information on the last two bytes. Table 1.
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For code 0 and 15, the absolute value is a minimum (saturation). When the image contrast becomes faint because of a low temperature difference between the finger and the sensor, it is recommended to use the temperature stabilization circuitry to increase the temperature by two codes (that is from 8 to 10), so as to obtain a sensor increase of at least >1.4 Kelvin. This enables enough contrast to obtain a proper fingerprint reconstruction. 3.
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AT77C102B Figure 3-11. Nap Mode Nap mode Reset RST Nap Clock PCLK In nap mode, all internal transistors are in shut mode. Only leakage current is drained in the power supply, generally less than the tested value. 3.
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4. Packaging: Mechanical Data Figure 4-1. Product Reference: AT77C102B-CB01YV 0.2 A Top View (all dimensions in mm) 0.89 ±0.3 14 TOP VIEW SCALE 10/1 0.32 2.33 ±0.5 2.95 ±0.50 5.90 max 9 ±0.3 A +0.07 1.64 -0.01 At 0.4 heigh from B ref. 0.82 ±0.50 0.2 min 5.20 max 26.6 ±0.3 Dam and Fill B 0.74 ±0.06 SIDE VIEW 1.5 max. SCALE 10/1 0.2 max 0.82 ±0.18 Figure 4-2. Product Reference: AT77C102B-CB01YV Bottom View (All dimensions in mm) 1 +_ 0.08 0.5+_ 0.08 1.15 +_ 0.15 3.5 +_ 0.08 2.15 +_ 0.
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AT77C102B Figure 4-3. Product Reference: AT77C102B-CB02YV All Dimensions in mm +0.04 5.2 max 14.32 -0.01 9.85 ±0.3 0.74 +_ 0.06 5.9 max 8.9 ±0.5 FLEX OUTPUT 4.1 ±0.2 8.8 ±0.2 2.9±0.5 +0.33 4.1±0.5 0.75 -0.25 1.25 ±0.5 +0.15 1.5-0.23 (x 3) 0.82 ± 0.18 1.9±0.4 1.5 MAX Scale 4/1 0.2 min 2.39 ±0.5 26.6 ±0.3 +0.08 4.1.1 FLEX OUTPUT 6.3 ±0.1 1.78 ±0.5 (x 2) +0.07 1.64 -0.01 4.1 A R0.75 -0.
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5. Ordering Information 5.
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Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg.