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BU9718KV Dataheets PDF



Part Number BU9718KV
Manufacturers Rohm
Logo Rohm
Description Picture cell driver for STN LCD driver for low voltage power supplies
Datasheet BU9718KV DatasheetBU9718KV Datasheet (PDF)

Standard ICs Picture cell driver for STN (LCD driver) for low voltage power supplies BU9718KV The BU9718KV is a driver IC designed for the character-type STN liquid crystal panels which are ideal for applications such as portable devices. The number of display segments includes 32 output segments and 3 common outputs, enabling drive of up to 96 segments. A compact 48-pin QFP package with a pitch of 0.5 mm is used, enabling compact size for the set as a whole. Applications • Portable terminals (.

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Standard ICs Picture cell driver for STN (LCD driver) for low voltage power supplies BU9718KV The BU9718KV is a driver IC designed for the character-type STN liquid crystal panels which are ideal for applications such as portable devices. The number of display segments includes 32 output segments and 3 common outputs, enabling drive of up to 96 segments. A compact 48-pin QFP package with a pitch of 0.5 mm is used, enabling compact size for the set as a whole. Applications • Portable terminals (POS, ECR, PDA, and others), movie projectors, cameras, telephones (cordless handFeatures • 1) Operates on 3V power supply. 2) Low current dissipation. (0.1µA in low power mode (actual value)) 3) Compact package. (molded section is 7.0 mmٗ) held telephone units), and others Low-voltage power supply sets 4) Up to 32 segment output pins and 3 common output pins are provided, enabling a total display of up to 96 segments. 5) 1 / 3 duty display. 6) Either 1 / 2 or 1 / 3 bias can be selected for power supply for LCD display. Limits – 0.3 ~ + 7.0 – 0.3 ~ VDD + 0.3 – 0.3 ~ VDD + 0.3 300 3 400 ∗2 – 55 ~ + 125 Unit V V V µA mA mW °C •Absolute maximum ratings (Ta = 25°C, V Parameter Power supply voltage∗1 Input voltage∗1 Output voltage∗1 Output current Power dissipation Storage temperature Symbol VDD VIN VOUT ISO ICO Pd Tstg SS = 0V) Pin VDD OSC, CS, CK, DI, RES OSC S1 ~ S32 COM1 ~ COM3 — — ∗1 Max. voltage that can be applied with a VSS pin ∗2 Reduced by 4.0mW for each increase in Ta 1°C over 25°C. •Recommended operating conditions (Ta = 25°C, V Parameter Power supply voltage∗ Input voltage∗ Oscillation freq., with external input External resistance External capacitance Operating temperature Symbol VDD VDD1 VDD2 fOSC R C Topr Pin VDD VDD1 VDD2 OSC OSC OSC — SS = 0V) Min. 2.7 0 0 — — — Typ. — 2 / 3 VDD 1 / 3 VDD 38 47 1000 — Max. 3.5 VDD VDD 100 — — 85 Unit V V V kHz kΩ pF °C – 40 ∗ Indicates the max. voltage that can be applied with a VSS pin. 1 Standard ICs BU9718KV •Block diagram VDD1 VDD2 LCD Power RES CS DI CK CTRL Logic Data Latch OSC OSC Common Driver Segment Driver S30 S31 COM1 COM2 COM3 COM1 •Pin assignments 37 36 COM2 COM3 RES VDD VDD1 VDD2 VSS OSC CS CK DI N.C. 25 24 N.C. S22 S21 S20 S19 S18 VQFP48 N.C. S32 S31 S30 S29 S28 S27 S26 S25 S24 S23 S17 S16 S15 S14 S13 48 1 S10 S11 S1 S2 S3 S4 S5 S6 S7 S8 S9 13 12 N.C. S12 2 S32 S1 S2 S3 S4 Standard ICs BU9718KV •Pin descriptions Pin No. 1—11 13—23 26—35 36 37 38 39 44 45 46 47 41 42 Pin name S1—S11 S12—S22 S23—S32 COM1 COM2 COM3 RES OSC CS CK DI VDD1 VDD2 I/O O Function Segment data output pin; outputs LCD drive voltage that matches COM1 - COM3 compatible data Common drive output; frame freq. fC = (fOSC / 384) Hz Reset input; when RES = L, resets internal data (include. control data) Oscillation pin (for common, segment alternation waves) Chip segment input; when CS = H, data can be transferred Synchronous clock input for serial data transfer Serial data input Internal standard voltage for liquid-crystal drive; when using 1 / 2 bias mode, connects to VDD2 Internal standard voltage for liquid-crystal drive; when using 1 / 2 bias mode, connects to VDD1 Processing when not in use OPEN O VSS I — I I I — — VDD VSS VSS VSS VSS OPEN OPEN • Electrical characteristics (unless otherwise noted, Ta = 25°C, V Parameter Input high level voltage Input low level voltage Input high level current Input low level current Output high level voltage Symbol VIH VIL IIH IIL VSOH VCOH VSOL VCOL VCM1 VSM1 Output medium level voltage VCM2 VSM2 VCM3 Power supply current IQ IDD Min. 0.8 VDD 0 0 0 — — — — — — — — — — — Typ. — — — — VDD – 1.0 VDD – 1.0 1.0 1.0 1 / 2 VDD ± 1.0 2 / 3 VDD ± 1.0 2 / 3 VDD ± 1.0 1 / 3 VDD ± 1.0 1 / 3 VDD ± 1.0 0.1 100 Max. VDD 6.0 6.0 — — — — — — — — — 30 300 DD = 2.7V to 3.5V, VSS = 0V) Unit V V µA µA V V V V V V V V V µA µA Conditions — — VI = VDD VI = VSS IO = – 20µA IO = – 100µA IO = 20µA IO = 100µA 1 / 2bias 1 / 3bias 1 / 3bias 1 / 3bias 1 / 3bias Low-power mode fOSC = 38kHz Pin CS, CK, DI, RES CS, CK, DI, RES CS, CK, DI, RES CS, CK, DI, RES S1 ~ S32 COM1 ~ COM3 S1 ~ S32 COM1 ~ COM3 COM1 ~ COM3 S1 ~ S32 COM1 ~ COM3 S1 ~ S32 COM1 ~ COM3 — — 0.2 VDD Output low level voltage 3 Standard ICs BU9718KV DD •AC characteristics (unless otherwise noted, Ta = 25°C, V Parameter Guaranteed oscillation range Operating frequency Data set-up time Data hold time CS set-up time CS hold time CK "H" level pulse width CK "L" level pulse width Rise time Fall time Symbol fOSC fOSC tDS tDH tCS tCH tCKH tCKL tr tf Min. 10 — 200 200 200 200 200 200 — — Typ. 38 — — — — — — — — — = 2.7V to 3.5V, VSS = 0V) Max. 80 100 — — — — — — 100 100 Unit kHz kHz ns ns ns ns ns ns ns ns Conditions C = 1000pF R = 47kΩ External input — — — — — — — — Pin OSC OSC CK, DI CK, DI CS, CK CS, CK CK CK CS, CK, DI CS, CK, DI AC timing waveform (1) When CK is stopped at “L” 0.8VDD CS tCS tCKH tCKL tCH 0.2VDD 0.8VDD 0.5VDD CK tDS tDH tr 0.5VDD 0.8VDD 0.2VDD .


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