STFPC320 查看數據表（PDF） - STMicroelectronics

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STFPC320

Front panel controller/driver with standby power management and real-time clock

STMicroelectronics 

Electrical characteristics

STFPC320

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

tDISP ≈ 500μs (1)

SEG Output

DIG1

DIG2

DIG3

DIGn

Key scan data

DIG1

G1

G2

1/16 tDISP

G3

Gn

1 frame = tDISP x (n+1)

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.

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