Datasheet Standard LCD Segment Driver BU9797FUV MAX 144 Segments (SEG36COM4) Features Key Specifications Integrated RAM for Display Data (DDRAM): Supply Voltage Range: +2.5V to +5.5V 36 x 4 bit (Max 144 Segment) Operating Temperature Range: -40C to +85C LCD Drive Output: Max Segments: 144Segments 4 Common Output, Max 36 Segment Output Display Duty: 1/4 Integrated Buffer AMP for LCD Driving Bias: 1/2, 1/3 selectable Integrated Oscillator Circuit Interface: 2wire serial interface No External Components Low Power Consumption Design Package W (Typ) x D (Typ) x H (Max) Applications Telephone FAX Portable equipment (POS, ECR, PDA etc.) DSC DVC Car audio Home electrical appliance Meter equipment Etc. TSSOP-C48V 8.1mm x 12.5mm x 1.0mm Typical Application Circuit VDD BU9797FUV VDD COM0 VLCD COM1 COM2 COM3 SDA Segment Controller SCL LCD SEG0 SEG1 OSCIN TEST1 VSS SEG35 Using internal oscillator Figure 1. Typical application circuit Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays. www.rohm.com TSZ02201-0P4P0D300820-1-2 2014 ROHM Co., Ltd. All rights reserved. 1/25 TSZ2211114001 5.Aug.2014 Rev.001Datasheet BU9797FUV MAX 144 segments (SEG36COM4) Block Diagram / Pin Configuration / Pin Description BU9797FUV SEG31 SEG30 SEG32 SEG29 SEG33 SEG28 COM0 COM3 SEG0 SEG35 SEG34 SEG27 SEG35 SEG26 VDD LCD voltage generator Common Segment COM0 SEG25 driver driver COM1 SEG24 COM2 SEG23 COM3 SEG22 LCD BIAS VLCD SEG21 SELECTOR VDD SEG20 Common Blink timing DDRAM generator counter VSS SEG19 TEST1 SEG18 VLCD OSCIN SEG17 SCL SEG16 SDA SEG15 Command Command OSCIN Data Decoder register NC SEG14 OSCILLATOR Power On Reset SEG0 SEG13 Serial interface SEG1 SEG12 IF FILTER SEG2 SEG11 VSS SEG3 SEG10 SEG4 SEG9 SCL SDA SEG5 SEG8 SEG6 SEG7 Figure 2. Block Diagram Figure 3. Pin Configuration (TOP VIEW) Table 1. Pin Description Pin Name Pin No. I/O Function Test input (ROHM use only) TEST1 13 I Must be connect to VSS NC 17 OPEN terminal External clock input OSCIN 14 I External clock and Internal clock can be selected by command Must be connect to VSS when use internal oscillator SDA 16 I/O Serial data in-out terminal SCL 15 I Serial clock for data transfer terminal 12 Ground VSS VDD 11 Power supply 10 Power supply for LCD driving VLCD 18-48, SEG0 to 35 O SEGMENT output for LCD driving 1-5 6-9 O COMMON output for LCD driving COM0 to 3 www.rohm.com TSZ02201-0P4P0D300820-1-2 2014 ROHM Co., Ltd. All rights reserved. 2/25 TSZ2211115001 5.Aug.2014 Rev.001