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STFPC320 Folha de dados(PDF) 72 Page - STMicroelectronics

Nome de Peças STFPC320
Descrição Electrónicos  Front panel controller/driver with standby power management and real-time clock
PDF  78 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STFPC320 Folha de dados(HTML) 72 Page - STMicroelectronics

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Electrical characteristics
STFPC320
72/78
17.7
Timing characteristics
VDD = 3.3 V, TA = -20 to 70°C, unless otherwise noted. Typical values are at TA = 25°C
Figure 55.
Key scanning and display timing
Note:
Pulse width of segment signal is decided by oscillator frequency. The value can be modified
by trimming ROSC. One cycle of key scanning consists of one frame and data of 12 x 2
matrices are stored in RAM.
The keyscan is only at the end of the frame when the display is ON. When the display is
OFF, the key scan takes place continuously. The grid is turned off during the key scan.
DIG1
DIG2
DIG3
DIGn
SEG Output
G1
G2
G3
Gn
Key scan data
DIG1
1 frame = t
DISP x (n+1)
1/16 t
DISP
t
DISP ≈ 500μs
(1)



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