BU9728

Standard ICs LCD driver for segment-type LCDs BU9728AKV The BU9728AKV is a segment-type LCD system driver which can accommodate microcomputer control and a serial interface. An internal 4-bit common output and LCD drive power supply circuit enable configuration of a display system at low cost. Applications Movie projectors, car audio systems, telephones Features 1) Serial interface. (8-bit length) 2) Display RAM: Internal, 128 bits. (up to 128 segments can be displayed) 3) Internal power supply circuit for LCD drive. 4) Display duty: 1 / 4 5) Can be driven with low voltage and low current dissipation. Absolute maximum ratings (Ta = 25°C, V Parameter Power supply voltage 1 Power supply voltage 2 Power dissipation Operating temperature Storage temperature SS = 0V) Limits – 0.3 ~ + 7.0 – 0.3 ~ + VDD 400∗ – 20 ~ + 75 – 55 ~ + 125 Unit V V mW °C °C Symbol VDD VLCD Pd Topr Tstg over 25°C . ∗ Reduced by 4.0mW for each increase in Ta of 1°C Recommended operating conditions (Ta = 25°C, V Parameter Power supply voltage 1 Power supply voltage 2 (VDD - V3) Oscillation frequency SS = 0V) Max. 5.5 VDD — Unit V V kHz Conditions — The following relationship should be maintained: VDD м V1 м V2 м V3 м VSS. Rf = 470kΩ Symbol VDD VLCD fOSC Min. 2.5 0 — Typ. — — 36 1 Standard ICs BU9728AKV Block diagram VDD LCD Driver Bias Circuit RESET V1 V2 V3 VSS SD SCK C/D CS SEG0 Serial Interface Address Counter Display Data RAM (DD RAM) LCD Segment Driver 32bits SEG1 SEG31 Command...