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參數(shù)資料
| 型號(hào)： | CXA3621GE |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA30 |
| 封裝： | PLASTIC, LLGA-30 |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大小： | 117K |
| 代理商： | CXA3621GE |
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CXA3621GE
Description of Operation
Fingerprint sensor principle
The principle of this newly developed fingerprint sensor is described below (Fig. 1). The sensor block
contains an array of metal electrodes which are covered on top by an insulating film (overcoat). When a
finger (which is conductive matter) is placed directly against this surface, the three elements of the metal
electrode, the insulating film and the finger form a capacitor.
The difference between the fingerprint ridges and valleys is the difference in distance to the metal electrodes,
and becomes the difference in the capacitance values of the individually formed capacitors. (The ridge
capacitance values are determined by the dielectric constant of the insulating film, but the valleys contain air
in addition to this, making the difference between the ridge and valley capacitance values even greater than
the difference in distance.)
Using this principle, by applying a constant voltage to all metal electrodes, the charge level accumulated in
each electrode differs, making it possible to output the unevenness of the fingerprint as an electric signal by
transferring and converting these charges to voltages.
Fig. 1
Ridge
Valley
Fingerprint unevenness
Overcoat
Metal electrode
Inter-layer film
Si
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