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 compo-
nents allow for multifunction applications with a low number of pins.

Applications

Portable CD-DA players, portable CD stereos

Features

1) High speed operations and low voltage. (V

= 2.7

5.5V at 4.4MHz)

2) Internal 8-bit, 8-channel AD converter.
3) Internal pulse width counter.
4) Two internal serial input / outputs.

5) Internal 20-segment, 4-common LCD control-

ler / driver. (usable with 3 commons)

6) All segments output by the LCD controller / driver are

programmable for CMOS output.

Absolute maximum ratings (Ta = 25