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BU34675 Datasheet

  • BU34675

  • Single-chip 4-bit microcontroller for

  • 7頁

  • ROHM

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Optical disc ICs
Single-chip 4-bit microcontroller for
CD-DA
BU34675
The BU34675 is a compact 4-bit, single-chip microcontroller that includes all the I / O required for CD system control.
Circuits on the chip include a pulse width measurement counter (PWC), SIO, and an LCD controller / driver for a 28-seg-
ment display. The LCD segments can all be switched in software to CMOS output, and the extensive I / O allows many
functions with a low pin count.
FApplications
Portable CD-DA, CD / radio / cassette players
FFeatures
1) Low-voltage, high-speed operation (V
DD
= 2.3 to 5.5V
at 4.4MHz).
2) Pulse width measurement counter on chip (for re-
mote control reception).
3) SIO provided for communication with the DSP.
4) Seven-segment, four-common LCD controller / driv-
er on chip.
5) All segments of the LCD controller / driver output can
be switched to CMOS output using software.
FAbsolute
maximum ratings (Ta = 25_C)
FRecommended
operating conditions (Ta = 25_C)
569

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