BU24591
Optical ICs
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4bit 1chip micro-controller for CD-DA
BU24591


The BU24591 is a 4bit 1chip micro-controller for CD-DA that integrates multiple I/O, such as 8bit 8-channel AD converter,
pulse width counter, two lines of SIO, and LCD controller driver with 80 segment (Max.). All LCD segment can be
switched into CMOS output by the program. These I/O achieves multi-function with few pins.


!Applications
Portable CD-DA, CD radio cassette player


!Features
1) Low voltage, high-speed operation
(VDD=2.3 to 3.6V at 4.4MHz)
2) Built-in 8bit 8-channel AD converter
3) Built-in pulse width counter
4) Built-in two lines of SIO
5) Built-in LCD controller driver with 20 segments, 4 common (With 3 common available)
6) All segment output of LCD controller driver can be switched into CMOS output by the program.


!Absolute maximum ratings (Ta=25°C)
Parameter Symbol Limits Unit
V
Power dissipation Pd mW
Operating temperature range Topr °C
Storage temperature range Tstg °C
−25 to +75
−55 to +125
−0.3 to +4.5VDDApplied voltage
500
∗
∗ Reduced by 5mW for each increase in Ta of 1°C over 25°C.



!Recommended operating conditions (Ta=25°C)
Parameter Symbol Min. Typ. Max. Unit
Power supply voltage VDD 2.3 − 3.6 V
Input "H" voltage VIHS 0.75VDD − VDD V
Input "L" voltage VILS 0 − 0.15VDD V