5

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

-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

50

pF

Analog load

Not connected

pF

k

Ω

Operating temperature range

I grade

-40

°C to +85°C°C

Maximum current on TPP

ITPP

0

100

mA