CXP5078 Ver la hoja de datos (PDF) - Sony Semiconductor

Número de pieza

componentes Descripción

fabricante

CXP5078

CMOS 4-bit Single Chip Microcomputer

Sony Semiconductor 

CXP5076/5078

Notes on Application

See Fig. 11, Additive capacity calculation chart, when using the crystal oscillator and select the appropriate

capacity.

Ta = –20 to +75°C, VDD = 4.5 to 5.5V

200

EXTAL XTAL

150

C1

C2

100

C1 = C2 = C

50

0.1

1

5 10

100

f – Crystal oscillation frequency [MHz]

Fig. 12. Crystal oscillation circuit additive capacity calculation chart

Note) The above chart shows a range in which the average quartz resonator has a relatively fast oscillation

rising edge and stable characteristics. The capacity should be selected to correspond to the

appropriate constant for each quartz resonator, should the frequency of the quartz resonator be

accurately adjusted.

Fig. 13 shows an example of a circuit which can accurately adjust the frequency. Used here a trimmer

capacitor.

VDD

EXTAL

XTAL

Rd

C1

C2

Fig. 13. Frequency adjustment circuit

When using the A/D converter as the key input, it is recommended that the circuit structure shown in Fig. 14

be used.

VDD

AD

4.7k 1.2k

1.8k

3.3k

8.2k

SW1

SW2

SW3

SW4

SW5

VSS

(Resistance is all E12 series)

Fig. 14. Recommended example of key circuit by A/D converter

– 17 –

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