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参数资料
| 型号： | FCD4A14CC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | IMAGE SENSOR, CDIP20 |
| 封装： | CERAMIC, DIP-20 |
| 文件页数： | 5/18页 |
| 文件大小： | 426K |
| 代理商： | FCD4A14CC |
FCD4A14 PRELIMINARY SPECIFICATION
13/18
APPLICATION NOTES
Finger speed versus acquisition speed
A finger speed is:
very very slow below 1 cm/s
slow at a few cm/s (you have to take care to go slowly)
normal at 10 cm/s
fairly fast at 20 cm/s
maximum in the range of 100 cm/s (difficult to sweep)
As a full fingerprint image is reconstructed from the slices, it
is important that slices recover. The strict minimum is one line
of recovery, but 2 lines recovery is a good value, so the finger
must not move more than 6 pixels between two frames.
Maximum finger speed vs acquisition speed is summarized in
the following figure, and will help the user define the system
requirements for acquisition:
Parallel port
Parallel port must conform to the EPP specification for speed
purposes. A standard bi-directional parallel port is able to
acquire only about 200 kilobyte per second (it depends on the
PC): this is three times slower than EPP. Thus the maximum
finger speed is reduced 3 times.
The FCD4A14 can be directly connected to the parallel port
without interface glue.
Power must be supplied via the PS/2 port, for instance, as
power is not consistently available on the parallel port.
From a software point of view, the system must have a high
priority during acquisition, because if the PC does something
else (such as accessing the hard drive), some frames may be
skipped resulting in a “hole” in the fingerprint image.
USB / microprocessor
The FCD4A14 is easy to connect to a microcontroller that will
manage
the
USB
protocol.
The
same
applies
for
a
microprocessor / microcontroller / DSP.
(see also FC15A140 application note 02).
The USB microcontroller will send the data read on the data
bus directly on the USB cable. A program, called firmware, is
run on the USB microcontroller, and another program, called
the driver, is run on the host computer (generally a PC).
A transfer must be done, with a proper bandwidth reservation,
to make sure that the acquisition is regular without skipping
frames.
FCD4A14
De0
De1
De2
De3
Do0
Do1
Do2
Do3
PCLK
Data strobe pin 14
EPP Parallel port
ACLK
Acknowledge pin 11
RST
pin 16
OE
GND
TPE
pin 17
TPP
VCC
Data pin 2
Data pin 3
Data pin 4
Data pin 5
Data pin 6
Data pin 7
Data pin 8
Data pin 9
VCC
FCD4A14
8
Data
Do0-3, De0 -3
PCLK
clock
USB port
RST
output
OE
output
TPE
output
USB micro
USB
cable
TPP
Acquisition speed
kbyte/s
frame/s
cm/s
comments
100
89
2,7 slow
250
222
6,7 normal / bidir parallel port
700
623
18,7 fair speed / EPP
1000
890
26,7 fast speed / USB
1500
1335
40,0 very fast / max USB
2000
1779
53,4 extremely fast
maximum finger speed
相关PDF资料 |
PDF描述 |
|---|---|
| FCD4A14CC | IMAGE SENSOR, CDIP20 |
| FCD4A14CCB | IMAGE SENSOR |
| FCP-101 | 2-OUTPUT 9.6 W AC-DC REG PWR SUPPLY MODULE |
| FCP-031 | 2-OUTPUT 2.9 W AC-DC REG PWR SUPPLY MODULE |
| FCP-032 | 2-OUTPUT 3 W AC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FCD4B14 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Thermal Fingerprint Sensor with 0.4 mm x 14 mm Sensing Area and Digital Output |
| FCD4B14CC | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Thermal Fingerprint Sensor with 0.4 mm x 14 mm Sensing Area and Digital Output |
| FCD4B14CCB | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Thermal Fingerprint Sensor with 0.4 mm x 14 mm Sensing Area and Digital Output |
| FCD4C1690 | 制造商:n/a 功能描述:Power Semiconductor |
| FCD4N60 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:600V N-Channel MOSFET |
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