4055B 데이터 시트보기 (PDF) - STMicroelectronics

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4055B

LIQUID-CRYSTAL DISPLAY DRIVERS

STMicroelectronics 

HCC/HCF4054B/55B/56B

TYPICAL APLLICATIONS (continued)

Figure 14 : Typical 3 1/2 – Digit–crystal Display : (VDD = + 5V, VSS = 0V, VEE = – 10V, DFN = 30 Hz square).

In addition to the letters L, H, P, and A, five other let-

ters can be displayed through the use of simple

logic circuits preceding and following the

HCC/HCF4055B or HCC/HCF4056B devices.

Fig. 13 is an example of a circuit that converts an ”H”

display, (code 1011) to an ”F” display. One condition

that must be met is that VEE = VSS. If VEE ≠ VSS, the

HCC/HCF4054B must be used to level shift in the

appropriate places. In a similar manner the letters C,

E, J,and U can be displayed. These circuits can also

be used to drive LED displays provided the exclu-

sive-OR gates have sufficient output-current drive.

The letters B, D, G, I, O, and S may be represented

by the codes for numbers 8, 0, 6, 1, 0, and 5, respec-

tively, when there is preknowledge that only letters

are to be displayed.

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