4bit 1chip micro-controller for CD-DA
BU24591
Optical ICs
4bit 1chip micro-controller for CD-DA
BU24591
The BU24591 is a 4bit 1chip micro-controller for CD-D...
Description
BU24591
Optical ICs
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 Applied voltage Power dissipation Operating temperature range Storage temperature range Symbol VDD Pd Topr Tstg Limits −0.3 to +4.5 500 ∗ −25 to +75 −55 to +125 Unit V mW °C °C
∗ Reduced by 5mW for each increase in Ta of 1°C over 25°C.
!Recommended operating conditions (Ta=25°C)
Parameter Power supply voltage Input "H" voltage Input "L" voltage Symbol VDD VIHS VILS Min. 2.3 0.75VDD 0 Typ. − − − Max. 3.6 VDD 0.15VDD Unit V V V
1/7
BU24591
Optical ICs
!Block diagram
OSC1
OSC2
OSC03A
PWC01A
IRQ
PWC
STP
Y
TMR03B
SYSTEM CLK
T0,T1
CPU02A
X
IRQ
Acc
IRQ STP
STP04A
W0∼W3
FLAG
CLOCK GEN
FLAG STK
IRQ STP
BIX03A
BIN
RESET
...
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