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PDF AT77C102B Data sheet ( Hoja de datos )
| Número de pieza | AT77C102B | |
| Descripción | Thermal Fingerprint Sensor | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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)
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®
Actual size
Rev. 5364A–BIOM–09/05
1 page  
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. After capturing several images, Atmel proprietary software can recon-
struct a full 8-bit fingerprint image.
The AT77C102B has a small surface combined with CMOS technology, and a Chip-on-Board
package assembly. These facts contribute to a low-cost device.
The device delivers a programmable number of images per second, while an integrated analog-
to-digital converter delivers a digital signal adapted to interfaces such as an EPP parallel port, a
USB microcontroller or directly to microprocessors. No frame grabber or glue interface is there-
fore necessary to send the frames. These facts make AT77C102B an easy device to include in
any system for identification or verification applications.
Table 3-1. Absolute Maximum Ratings()
Parameter
Symbol
Positive supply voltage
Temperature stabilization
power
VCC
TPP
Front plane
FPL
Digital input voltage
RST PCLK
Storage temperature
Lead temperature
(soldering, 10 seconds)
Tstg
Tleads
Comments
Do not solder
Value
GND to 4.6
GND to 4.6
GND to VCC +0.5
GND to VCC +0.5
-50 to +95
Forbidden
Note: Stresses beyond those listed
under “Absolute Maximum Ratings”
may cause permanent damage to the
device. These are stress ratings only
and functional operation of the device at
these or any other conditions beyond
those indicated in the operational
sections of this specification is not
implied. Exposure to absolute
maximum rating conditions for extended
periods may affect device reliability.
Table 3-2. Recommended Conditions Of Use
Parameter
Symbol
Positive supply voltage
Front plane
VCC
FPL
Digital input voltage
Digital output voltage
Digital load
Analog load
Operating temperature range
Maximum current on TPP
CL
CA
RA
Tamb
ITPP
Comments
Must be grounded
Not connected
V grade
Min Typ Max
3V
3.3V
3.6V
GND
CMOS levels
CMOS levels
50
-40°C to +85°C
0 100
Unit
V
V
V
V
pF
pF
kΩ
°C
mA
5364A–BIOM–09/05
5
5 Page 
Figure 3-6. Functional Description
1
Column selection
2
Line sel
8 lines of 280 columns of pixels
1 dummy column
Amp
8
Chip
temperature
sensor
AT77C102B
34
Even
4-bit
ADC
4
4-bit
Odd ADC 4
8
latches
De0-3
Do0-3
3.2 Sensor
Each pixel is a sensor in itself. The sensor detects a temperature difference between the begin-
ning 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. Note that the integra-
tion time reset has nothing to do with the reset of the digital section.
Then, at a rate depending on the sensitivity of the pyroelectric layer, on the temperature varia-
tion between the reset and the end of the integration time, and for the duration of the integration
time, electrical charges are generated at the pixel level.
3.3 Analog-to-digital Converter/ Reconstructing an 8-bit Fingerprint Image
An analog-to-digital converter (ADC) is used to convert the analog signal coming from the pixel
into digital data that can be used by a processor.
As the data rate for the parallel port and the USB is in the range of 1 MB per second, and at least
a rate of 500 frames per second is needed to reconstruct the image with a fair sweeping speed
of the finger, two 4-bit ADCs have been used to output two pixels at a time on one byte.
3.4 Start Sequence
A reset is not necessary between each frame acquisition.
The start sequence must consist in:
1. Setting the RST pin to high.
2. Setting the RST pin to low.
3. Sending 4 clock pulses (due to pipe-line).
4. Sending clock pulses to skip the first frame.
Note that after a reset it is recommended to skip the first 200 slices to stabilize the acquisition.
Figure 3-7. Start Sequence
Reset RST
4 + 1124 clock pulses to skip the first frame
Clock PCLK
12341
1124
1
5364A–BIOM–09/05
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AT77C102B.PDF ] | |
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