Datasheet Standard LCD Segment Drivers BU9795AFV MAX 108 segments (SEG27COM4) Features Key Specifications Integrated RAM for display data (DDRAM) : Supply Voltage Range: +2.5V to +5.5V 27 4bit (Max 108 Segment) Operating Temperature Range: -40C to +85C LCD drive output : Max Segments: 108 Segments 4 Common output, Max 27Segment output Display Duty: 1/4 Integrated Buffer AMP for LCD driving Bias: 1/2, 1/3 selectable Integrated Oscillator circuit Interface: 3wire serial interface No external components Low power consumption design Packages 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. SSOP-B40 13.60mm x 7.80mm x 2.00mm Typical Application Circuit VDD COM0 VDD COM1 VLCD COM2 COM3 INHb CSB Controller Segment SD LCD SCL SEG4 SEG5 OSCIN TEST VSS SEG30 Internal oscillator circuit mode Figure 1. Typical application circuit Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays. www.rohm.com TSZ02201-0A0A2D300020-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/26 TSZ2211114001 20.Mar.2019 Rev.004 BU9795AFV MAX 108 segments (SEG27COM4) Block Diagrams / Pin Configurations / Pin Descriptions COM0COM3 SEG4SEG30 VDD LCD voltage generator Common Segment driver driver LCD BIAS SELECTOR Common Blink timing DDRAM counter generator 40 21 VLCD INHb Command Command Register Data Decoder OSCIN OSCILLATOR 1 20 Power On Reset Serial interface IF FILTER VSS TEST CSB SD SCL Figure 2. Block Diagram Figure 3. Pin Configuration (TOP VIEW) Table 1 Pin Description Pin name Pin No. I/O Function Input terminal for turn off display INHb 36 I H : turn on display L : turn off display Test input (ROHM use only) TEST 35 I Must be connected to VSS External clock input OSCIN 31 I Ex clock and Int clock can be changed by command. Must be connected to VSS when using internal oscillation circuit. SD 34 I Serial data input SCL 33 I Serial data transfer clock CSB 32 I Chip select : L active VSS 30 GND VDD 29 Power supply VLCD 28 I Power supply for LCD driving 1 to 23, SEG4 to SEG30 O SEGMENT output for LCD driving 37 to 40 COM0 to COM3 24 to 27 O COMMON output for LCD driving www.rohm.com TSZ02201-0A0A2D300020-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/26 TSZ2211115001 20.Mar.2019 Rev.004 SEG8 SEG7 SEG9 SEG6 SEG10 SEG5 SEG11 SEG4 SEG12 INHb SEG13 TEST SEG14 SDA SEG15 SCL SEG16 CSB SEG17 OSCIN SEG18 VSS SEG19 VDD SEG20 VLCD SEG21 COM3 COM2 SEG22 SEG23 COM1 SEG24 COM0 SEG25 SEG30 SEG26 SEG29 SEG27 SEG28