參數(shù)資料
型號(hào)： FCD4B14CCB
廠(chǎng)商： ATMEL CORP
元件分類(lèi)： 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)： 14/20頁(yè)
文件大?。?/td> 265K
代理商： FCD4B14CCB
14
FCD4B14
1962C
–
01/02
Thermometer
The dummy bytes DB3 and DB4 contains some internal and temperature information.
The even nibble nnnn in DB3 can be used to measure an increase (or decrease) of the
chip temperature, using the difference between two measures of the same physical
device. The following table gives values in Kelvin.
For code 0 and 15, the absolute value is a minimum (saturation).
When the image contrast becomes low because of a low temperature difference
between the finger and the sensor, it is recommended to use the temperature stabiliza-
tion circuitry to increase the temperature of two codes (i.e. from 8 to 10), to get at least
an increase >1.4 Kelvin of the sensor. This enables to recover enough contrast to get a
proper fingeprint for recognition purpose.
nnnn
Decimal
nnnn
Binary
Temperature differential with code 8 in
Kelvin
15
1111
11.2
14
1110
8.4
13
1101
7
12
1100
5.6
11
1011
4.2
10
1010
2.8
9
1001
1.4
8
1000
0
7
0111
-1.4
6
0110
-2.8
5
0101
-4.2
4
0100
-5.6
3
0011
-7
2
0010
-8.4
1
0001
-11.2
0
0000
< -16.8
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