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| 型号： | FTF1100MF1 |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, XMA |
| 文件页数： | 38/39页 |
| 文件大小： | 400K |
| 代理商： | FTF1100MF1 |
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FingerTIP
Infineon Technologies
8/38
FTF 1100 MF1 V2.0 databook 3.3 (05.00)
2.2 Functional Block Diagram of the FingerTIP
The block diagram (figure 1) shows the structure of the FingerTIP. The sensor surface
is made of an environmental resistant material that protects a matrix of 224 x 288 metal
electrode pixels. The measurement technology used is capacitive and outputs an 8-bit
value per pixel.
Figure 2 illustrates the capacitive measurement technology: The capacitance CP is formed
by a single metal electrode (pixel) and the finger that constitutes the second electrode.
Valleys and ridges on the finger will yield varying CP values. CP is too small for direct
measurement, therefore C P is measured indirectly. C P is charged (SW1 is closed and SW2
is open) and discharged (SW1 is open and SW2 is closed) up to 255 times. The voltage of
CC increases with each charge cycle. The charge stored in CP is proportional to the
capacitance of CP.
The voltage of CC is compared with the reference voltage Vref. If both values are equal, the
value of the 8-bit counter, which counts the number of charge cycles, is stored and the
charge cycle ends. This value represents the gray level of the pixel of a fingerprint. Two
values of Vref can be selected to allow different ranges of usable gray levels (section 2.3).
Figure 1: Functional Block Diagram FingerTIP
DATA
switch
8
DATA
OUT
1. pixel of 1. line
224. pixel of 1. line
parallel
data
select
EPP or SPI
output
serial
data
EPP/SPI /RESET /REQUEST READY SI
SCK
/CS
(EPP)
(SPI)
parallel /
serial
converter
sensor cell array
288 lines x 224 columns
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相关代理商/技术参数 |
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|---|---|
| FTF1100MF1V2.0 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| FTF1100MF1V2.1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| FTF3020-C | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Full Frame CCD Image Sensor |
| FTF3020-C/EG | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Full Frame CCD Image Sensor |
| FTF3020-C/HG | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Full Frame CCD Image Sensor |
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