ROHM BU34381 Datasheet
Optical disc ICs
Single-chip 4-bit microcontroller for
CD-DA
BU34381
The BU34381 is a 4-bit microcomputer designed for CD-DA players, and has a wide array of internal I / O components,
including an 8-bit, 8-channel AD converter, pulse width counter (PWC), two serial I/ O, and an LCD controller / driver
capable of displaying up to 80 segments. All LCD segments are programmable for CMOS output. These I / O components allow for multifunction applications with a low number of pins.
FApplications
Portable CD-DA players, portable CD stereos
FFeatures
1) High speed operations and low voltage. (V
5.5V at 4.4MHz)
2) Internal 8-bit, 8-channel AD converter.
3) Internal pulse width counter.
4) Two internal serial input / outputs.
DD = 2.7 X
5) Internal 20-segment, 4-common LCD controller / driver. (usable with 3 commons)
6) All segments output by the LCD controller / driver are
programmable for CMOS output.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
91
Optical disc ICs BU34381
Block diagram
92
Optical disc ICs BU34381
Pin assignments
Pin descriptions
93
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