Description – Rainbow Electronics AT77C101B FingerChip™ User Manual
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AT77C101B
2150A–BIOM–02/02
Description
AT77C101B is part of the Atmel FingerChip monolithic fingerprint sensor family for
which, no optics, no prism and no light source are required.
AT77C101B is a single chip, high performance, low cost sensor based on temperature
physical effects for fingerprint sensing.
AT77C101B has a linear shape, which captures a fingerprint image by sweeping the fin-
ger across the sensing area. After capturing several images, Atmel proprietary software
can reconstruct a full 8-bit fingerprint image, if needed.
AT77C101B has a small surface combined with CMOS technology, and a Chip-On-
Board or ceramic dual-in-line package assembly. These facts contribute to a low-cost
device.
AT77C101B delivers a programmable number of images per second, while an inte-
grated Analog to Digital Converter delivers a digital signal adapted to interfaces such as
an EPP parallel port, USB microcontroller or directly to microprocessors. Thus, no frame
grabber or glue interface is 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
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
T
stg
-50 to +85
°C
Lead temperature (soldering, 10 seconds)
T
leads
Do not solder
DIP: socket mandatory
Forbidden
°C
Table 2. Recommended Conditions Of Use
Parameter
Symbol
Comments
Min
Typ
Max
Unit
Positive supply voltage
V
CC
3V
5V
5.5V
V
Front plane
FPL
Must be grounded
GND
V
Digital input voltage
CMOS levels
V
Digital output voltage
CMOS levels
V
Digital load
C
L
50
pF
Analog load
C
A
R
A
Not connected
pF
k
Ω
Operating temperature range
T
amb
Civil: “C” grade
0 to +70
°C
Maximum current on TPP
ITPP
0
100
mA