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AT77C101B Datasheet(PDF) 5 Page - ATMEL Corporation

Part No. AT77C101B
Description  Thermal Fingerprint Sensor with Sensing Area and Digital Output
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT77C101B Datasheet(HTML) 5 Page - ATMEL Corporation

 
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5
AT77C101B FingerChip
2150B–BIOM–09/03
Description
The AT77C101B is part of the Atmel FingerChip monolithic fingerprint sensor family for
which no optics, no prism and no light source are required.
The AT77C101B is a single-chip, high-performance, low-cost sensor based on tempera-
ture physical effects for fingerprint sensing.
The AT77C101B 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 reconstruct a full 8-bit fingerprint image.
The AT77C101B 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 therefore necessary to send the frames. These facts make AT77C101B
an easy device to include in any system for identification or verification applications.
Note:
1. Absolute maximum ratings are limiting values, to be applied individually, while other parameters are within specified operat-
ing conditions. Long exposure to maximum ratings may affect device reliability.
Table 1. Absolute Maximum Ratings
(1)
Parameter
Symbol
Comments
Value
Unit
Positive supply voltage
V
CC
GND to 6.5
V
Temperature stabilization power
TPP
GND to 6.5
V
Front plane
FPL
GND to V
CC
V
Digital input voltage
RST PCLK
GND to V
CC
V
Storage temperature
Tstg
-50 to +95
°C
Lead temperature (soldering, 10 seconds)
T
leads
Do not solder
Forbidden
°C
Table 2. Recommended Conditions Of Use
Parameter
Symbol
Comments
Min
Typ
Max
Unit
Positive supply voltage
V
CC
3 V
5 V
5.5 V
V
Front plane
FPL
Must be grounded
GND
V
Digital input voltage
CMOS levels
V
Digital output voltage
CMOS levels
V
Digital load
CL
50
pF
Analog load
CA
RA
Not connected
pF
k
Operating temperature range
Tamb
I grade
-40
°C to +85°C°C
Maximum current on TPP
ITPP
0
100
mA


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