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PDF AT77C105A Data sheet ( Hoja de datos )
| Número de pieza | AT77C105A | |
| Descripción | FingerChip Thermal Fingerprint Sweep Sensor | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Thermal Sensitive Layer Over a 0.35 µm CMOS Array
• Image Zone: 0.4 x 11.6 mm
• Image Array: 8 × 232 = 1856 Pixels
• Pixel Pitch: 50 × 50 µm = 500 dpi Resolution
• On-chip 8-bit Analog to Digital Converter
• Serial Peripheral Interface (SPI) - 2 Modes:
– Fast Mode at 16 Mbps Max for Imaging
– Slow Mode at 200 kbps Max for Navigation and Control
• Die Size: 1.5 × 15 mm
• Operating Voltage: 2.3 to 3.6V
• I/O Voltage: 1.65 to 3.6V
• Operating Temperature Range: -40°C to 85°C
• Finger Sweeping Speed from 2 to 20 cm/Second
• Low Power: 4.5 mA (Image Acquisition), 1.5 mA (Navigation), <10 µA (Sleep Mode)
• Hard Protective Coating (>4 Million Sweeps)
• High Protection from Electrostatic Discharge
• Small Form Factor Packaging
Description
Atmel’s AT77C105A fingerprint sensor is dedicated to PDA, cellular and smartphone
applications. Based on FingerChip thermal technology, the AT77C105A is a linear
sensor that captures fingerprint images by sweeping the finger over the sensing area.
This product embeds true hardware-based 8-way navigation and click functions as
well, as enabling elimination of mechanical joystick devices.
Applications
• Scrolling, Menu and Item Selection for PDAs, Cellular or Smartphone Applications
• Cellular and Smartphones-based Security (Device Protection, Network and ISP
Access, E-commerce)
• Personal Digital Agenda (PDA) Access
• User Authentication for Private and Confidential Data Access
• Portable Fingerprint Acquisition
FingerChip®
Thermal
Fingerprint
Sweep Sensor,
Hardware
Based
Navigation and
Click Functions,
Extended I/O
range (1.8-3.3V)
AT77C105A
Preliminary
Chip-on-board Package
Sweep your finger
to make life easier
Actual size of sensor
5419A–BIOM–01/05
1 page  
AT77C105A [Preliminary]
Note: TBC = To be confirmed
Table 5. Explanation of Test Levels
Level Description
I 100% production tested at +25°C
II 100% production tested at +25°C, and sample tested at specified temperatures (AC testing done on sample)
III Sample tested only
IV Parameter is guaranteed by design and/or characterization testing
V Parameter is a typical value only
VI 100% production tested at temperature extremes
D 100% probe tested on wafer at Tamb = +25°C
Table 6. Specifications
Parameter
Resolution
Size
Yield: number of bad pixels
Symbol
Test Level
IV
IV
I
Min(1)
Typ
50
8 × 232
Max(1)
5
Unit
Micron
Pixel
Bad pixels
Power Consumption and DC Characteristics
The following characteristics are applicable to the operating temperature -40°C ≤ T ≤ +85°C.
Typical conditions are: power supply = 3.3V; Tamb = 25°C; FSCK = 12 MHz (1600 slices per second); duty cycle = 50%
CLOAD 120 pF on digital outputs unless otherwise specified.
Table 7. Power Requirements
Name Parameter
VDD
IDD
IDDNAV
IDDCLI
IDDSLP
IDDSTB
Positive supply voltage
Current on VDD in acquisition mode
Current on VDD in navigation mode
Current on VDD in click mode
Current on VDD in sleep mode
Current on VDD in stand-by mode
Conditions
Test Level
I
I
I
I
I
I
Min(1)
Typ
Max(1)
Unit-
2.3 2.5/3.3 3.6
V
3 4.5 6 mA
1 1.5 2 mA
0.2 0.3 0.5 mA
10 µA
Refer to “Power Management” on page 32
Note: 1. Min and max values are to be confirmed.
5419A–BIOM–01/05
5
5 Page 
AT77C105A [Preliminary]
Functional Description
The AT77C105A is a fingerprint sensor based on FingerChip technology. It is controlled
by an SPI serial interface through which output data is also transferred (a slow SPI for
the pointing function and a fast one for acquisition). Six modes are implemented:
– Sleep Mode: A very low consumption mode controlled by the reset pin RST.
In this mode, the internal clocks are disabled and the registers are initialized.
– Stand-by Mode: Also a low consumption mode that waits for an action from
the host. The slow serial port interface (SSPI) and control blocks are
activated. In this mode the oscillator can remain active.
– Click Mode: Waits for a finger on the sensor. The SSPI and control blocks
are activated. The local oscillator, the click array and the click block are all
activated.
– Navigation Mode: Calculates the finger’s x and y movements across the
sensor. The SSPI and control blocks are still activated. The local oscillator,
the navigation array and the navigation block are also activated.
– Acquisition Mode: Slices are sent to the host for finger reconstruction and
identification. The SSPI and control blocks are still activated. The fast serial
port interface block (FSPI) and the acquisition array are activated, as well as
the local oscillator when watchdog is required.
– Test: This mode is reserved for factory testing.
In the final application, three main modes are used:
– Stand-by: Low consumption mode
– Pointing: Equivalent to click and navigation modes
– Acquisition: Fingerprint image capture
Note:
The term”host” describes the processor (controller, DSP...) linked to the sensor. It is the
master. In the description of n-bit registers (see “Function Registers” on page 13), the
term “b0” describes the Least Significant Bit (LSB). The term “b(n-1)” describes the Most
Significant Bit (MSB). Binary data is written as 0b_ and hexadecimal data as 0x_.
5419A–BIOM–01/05
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AT77C105A.PDF ] | |
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