msm7715 Oki Semiconductor, msm7715 Datasheet - Page 12

• Manufacturer Part Number: msm7715
• Description: Multi-function Telecommunication Lsi
• Manufacturer: Oki Semiconductor

¡ Semiconductor
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.
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.
Digital input pin
The digital input pin contains a pull-up resistor. Therefore, supply the V
pin or open this pin to input "1". To input "0", supply the V
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 V
input pin.
Figure 4 Connection of
C1
C2
3.579545 MHz
the Crystal Resonator
peripherals
To the
C3
C6
X1
X2
Figure 6 Signal Ground
SGO
SGC
3.579545 MHz
+
+
–
–
Figure 5 Connection of
IL
–
+
voltage remains connected to the digital
IL
SG voltage
generating
To the internal
circuit
circuit
voltage (GND) to this pin.
the External Clock
IH
voltage (V
X1
X2
MSM7715
DD
) to this
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