MSM7715 データシートの表示（PDF） - Oki Electric Industry

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MSM7715

Multi-Function Telecommunication LSI

Oki Electric Industry 

¡ Semiconductor

MSM7715

FUNCTIONAL DESCRIPTION

Oscillation circuit

Connect a 3.579545 MHz crystal resonator between X1 and X2. If the load capacitance of the

crystal resonator is 16 pF, connect a 12 pF capacitor between X1 and GND and between X2 and

GND.

When an external clock is used, input the external clock to X2 via a 200 pF capacitor and leave

X1 open.

C1

X1

X1

C2

X2

3.579545 MHz

X2

3.579545 MHz

Figure 4 Connection of

the Crystal Resonator

Figure 5 Connection of

the External Clock

Signal ground

Connect a capacitor of 1 mF between SGC and GND. Do not connect anything other than this

capacitor to the SGC pin.

SGO can also be used as the reference voltage for the peripheral circuit. A capacitor of 0.1 mF or

more should be connected between SGO and GND.

C3

To the

peripherals

C6

SGC

+

–

+

SGO

–

SG voltage

generating

circuit

To the internal

circuit

Figure 6 Signal Ground

Digital input pin

The digital input pin contains a pull-up resistor. Therefore, supply the VIH voltage (VDD) to this

pin or open this pin to input "1". To input "0", supply the VIL voltage (GND) to this pin.

Upon power down (PON = "1"), this pull-up goes into a high-impedance state. Therefore, current

is not affected upon power down even though the VIL voltage remains connected to the digital

input pin.

12/21

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