BU24591

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 ...