參數(shù)資料
型號(hào)： FCD4B14CCB
廠商： ATMEL CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： Thermal Fingerprint Sensor with 0.4 mm x 14 mm Sensing Area and Digital Output
中文描述： IMAGE SENSOR, UUC21
封裝： COB-21
文件頁(yè)數(shù)： 15/20頁(yè)
文件大?。?/td> 265K
代理商： FCD4B14CCB
15
FCD4B14
1962C
–
01/02
Integration Time and
Clock Jitter
The FCD4B14 is not very sensitive to clock jitter (clock variation). The most important
requirement is a regular integration time that ensures the frame reading rate is also as
regular as possible, in order to get consistent fingerprint slices.
If the integration time is not regular, contrast will vary from one frame to another.
Note that it is possible to introduce some waiting time between each set of 1124 clock
pulses, but the overall time of one frame read must be regular. This waiting time is gen-
erally the time needed by the processor to perform some calculation over the frame (to
detect the finger, for instance).
Figure 10.
Read One Frame
Figure 11.
Regular Integration Time
Clock PCLK
Reset RST is low
1
2
3
4
5
6
1124
1123
1122
1121
1120
1119
Column 1
Column 2
Column 280
Dummy Column 281
Pixels 1 & 2 3 & 4 5 & 6 7 & 8 1 & 2 3 & 4
7 & 8
DB1 DB2 DB3 DB4
Clock PCLK
REGULAR INTEGRATION TIME
Frame n
1124 pulses
Frame n+1
1124 pulses
Frame n+2
1124 pulses
Frame n+3
1124 pulses
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