LC87F14C8A Datasheet, PDF (24/26 Pages) Sanyo Semicon Device – CMOS IC FROM 128K byte, RAM 10K byte on-chip 8-bit 1-chip Microcontroller with USB-host controller

LC87F14C8A
P34/FILT
0Ω
+
2.2µF
-
When using the internal PLL circuit to generate the
48MHz clock for USB , it is necessary to connect a filter
circuit such as that shown to the left to the P34/FILT pin.
Figure 5 Filter Circuit for the Internal PLL Circuit
UHD+
5pF
UHD-
5pF
33Ω
15kΩ
33Ω
15kΩ
Note:
It’s necessary to adjust the Circuit Constant of
the USB Port Peripheral Circuit each mounting
board.
Figure 6 USB Port Peripheral Circuit
VDD
RRES
Note:
Determine the value of CRES and RRES so
that the reset signal is present for a period of
RES
200µs after the supply voltage goes beyond the
CRES
lower limit of the IC's operating voltage.
Figure 7 Reset Circuit
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