BU34381

Manufacturer Part NumberBU34381
DescriptionSingle-chip 4-bit Microcontroller For
ManufacturerROHM Co. Ltd.
BU34381 datasheet
 


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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.
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.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
= 2.7 X
5) Internal 20-segment, 4-common LCD control-
DD
ler / driver. (usable with 3 commons)
6) All segments output by the LCD controller / driver are
programmable for CMOS output.
91

BU34381 Summary of contents

  • Page 1

    ... CD-DA BU34381 The BU34381 is a 4-bit microcomputer designed for CD-DA players, and has a wide array of internal components, including an 8-bit, 8-channel AD converter, pulse width counter (PWC), two serial and an LCD controller / driver capable of displaying segments. All LCD segments are programmable for CMOS output. These compo- nents allow for multifunction applications with a low number of pins ...

  • Page 2

    ... Optical disc ICs FBlock diagram 92 BU34381 ...

  • Page 3

    ... Optical disc ICs FPin assignments FPin descriptions BU34381 93 ...

  • Page 4

    ... Optical disc ICs 94 BU34381 ...

  • Page 5

    ... Optical disc ICs FInput / output circuits BU34381 95 ...

  • Page 6

    ... Optical disc ICs FElectrical characteristics (at 5V) (unless otherwise noted 25_C BU34381 = 5V) DD ...

  • Page 7

    ... Optical disc ICs BU34381 97 ...

  • Page 8

    ... Optical disc ICs FElectrical characteristics (at 3V) (unless otherwise noted 25_C BU34381 = 3V) DD ...

  • Page 9

    ... input is programmable in 1-bit units as digital : 3 factors input (13) Internal 8-bit timer counter (also used as event counter) (14) Two internal serial input / outputs (LSB fast) that simplify interface with external LSI chips (15) 12 input / outputs (programmable pull-up) (16) 5 inputs (programmable pull-up) BU34381 99 ...

  • Page 10

    ... Optical disc ICs FExternal dimensions (Units: mm) 100 BU34381 ...