LC87F1A32A Datasheet, PDF (24/26 Pages) Sanyo Semicon Device – CMOS IC FROM 32K byte, RAM 2048K byte on-chip 8-bit 1-chip Microcontroller with Full-Speed USB

LC87F1A32A
P34/UFILT
Rd
0
+ _Cd
- _2.2F
When using the internal PLL circuit to generate
the 48 MHz clock for USB , it is necessary to
connect a filter circuit such as that shown to the
left to the P34/UFILT pin.
Figure 5 External Filter Circuit for the Internal USB-dedicated PLL Circuit
VD3OEN
P70
D+
5pF
1.5k
27 to 33
D-
5pF
27 to 33
Note:
It’s necessary to adjust the Circuit Constant of the USB
Port Peripheral Circuit each mounting board. Make the
D+ Pull-up resistors available to control on/off according
to the Vbus.
Figure 6 USB Port Peripheral Circuit
VDD
RRES Note:
Determine the value of CRES and RRES so
RES
that the reset signal is present for a period of
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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