TECHNICAL NOTE LCD Segment Driver series For 128 140 Segment type LCD LCD Segment Driver BU9728AKV, BU9795AKV/FV/GUW Outline This is LCD segment driver for 126 to 140 segment type display. There is a lineup which is suitable for multi function display and is integrated display RAM and power supply circuit for LCD driving with 4 common output type: BU9728AKV and BU9795AKV/FV/GUW. 128Segment (SEG32COM4) Driver BU9728AKV P.1 140Segment (SEG35COM4) Driver BU9795AKV/FV/GUW P.10 BU9728AKV 128Segment (SEG32COM4) Driver Feature (BU9728AKV) 1) 4wire serial interface (SCK, SD, C / D, CS) 2) Integrated RAM for display data (DDRAM) : 32 4bit (Max 128 Segment) 3) LCD driving port: 4 Common output, 32 Segment output 4) Display duty: 1/4 duty 5) Integrated Oscillator circuit (external resister type) 6) Integrated Power supply circuit for LCD driving (1/3 bias) 7) Low voltage / low power consumption design: +2.55.5V Uses (BU9728AKV) DVC, Car audio, Telephone Absolute Maximum Ratings (Ta=25degree, VSS=0V) (BU9728AKV) Parameter Symbol Limits Unit Remarks Power Supply Voltage1 VDD -0.3 +7.0 V Power supply Power Supply Voltage2 VLCD -0.3 +7.0 V LCD drive voltage When use more than Ta=25 C, subtract Allowable loss Pd 400 mW 4mW per degree. Operational temperature range Topr -40 +85 degree Storage temperature range Tstg -55 +125 degree Input voltage range VIN -0.3 to VDD+0.3 V Output voltage range VOUT -0.3 to VDD+0.3 V *This product is not designed against radioactive ray. Recommend operating conditions (Ta=25degree, VSS=0V) (BU9728AKV) Parameter Symbol MIN TYP MAX Unit Remarks Power Supply Voltage1 VDD 2.5 - 5.5 V Power Supply Voltage2 VLCD 0 - VDD V VDDV1V2V3VSS Oscillator frequency fOSC - 36 - KHz Rf=470k This document is not delivery specifications. Jul. 2008 Electrical Characteristics (BU9728AKV) DC Characteristics (VDD=2.55.5V, VSS=0V, Ta=25degree, unless otherwise specified) Limit Symbo Uni Parameter Condition Terminal l Min. Typ. Max. t VO=0.9VDD H level input voltage VIH1 0.8VDD - VDD V SC1, SD, SCK, or 0.1VDD C / D, CS, RESET VO=0.1VDD VIL1 0 - 0.2VDD V L level input voltage or 0.9VDD SEG031, COM03 VON =0.1V LCD Driver on resistance RON - - 30 k L level Input current1 IIL1 - - 100 A VIN=0 RESET OSC1, SD, SCK, L level Input current2 IIL2 - - 2 A VIN=0 C / D, CS OSC1, SD, SCK, VIN=VDD H level Input current IIH -2 - - A C / D, CS, RESET CI - 5 - pF Input capacitance SD, SCK, C / D, CS *2 Display OFF - 0.05 1 A *3 IDD - 40 80 A Display ON VDD Power consumption *4 - 100 250 A MPU Access *1: LCD Driver on resistance is not included internal power supply impedance *2: V3=0V, All input terminal are connected to VDD or VSS. *3: V3=0V, Rf=470k, except of OSC1 terminals are connected to VDD or VSS. *4: V3=0V, Rf=470k, fSCK=200kHz AC Characteristics (VDD=2.55.5V, VSS=0V, Ta=25degree, unless otherwise specified) Symbo Limit Parameter Unit Condition l Min. Typ. Max. SCK rise time tTLH - - 100 ns SCK fall time tTHL - - 100 ns SCK cycle time tCYC 800 - - ns Wait time for command tWAIT 800 - - ns SCK pulse width H tWH1 300 - - ns SCK pulse width L tWL1 300 - - ns SD setup time tSU1 100 - - ns SD hold time tH1 100 - - ns CS pulse width H tWH2 300 - - ns CS pulse width L tWL2 6400 - - ns CS setup time tSU2 100 - - ns CS hold time tH2 100 - - ns C/D setup time tSU3 100 - - ns th C/D hold time tH3 100 - - ns Based on SCK 8 clock rising C/D CS time *5 tCCH 100 - - ns Based on C S rising th C/D SCK time *5 tSCH 100 - - ns Based o SCK 8 clock falling *5: Should satisfy either one condition 2/23