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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
(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 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
kΩ
Operating temperature range T
amb
Civil: “C” grade 0 to +70 °C
Maximum current on TPP ITPP 0 100 mA
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