Datasheet Low Duty LCD Segment Driver BU9795BGUW MAX 124 Segments (SEG31COM4) Key Specifications General Description Supply Voltage Range: +2.5V to +5.5V BU9795BGUW is a 1/4 Duty General-purpose LCD Operating Temperature Range: -40C to +85C driver that can be used for consumer / battery operated Max Segments: 124 Segments products.BU9795BGUW can drive up to 124 LCD Display Duty: 1/4 Segments. Bias: 1/2, 1/3 selectable It has integrated display RAM for reducing CPU load. Interface: 3wire serial interface Also, it is designed with low power consumption and no external component needed. Its small BGA package of BU9795BGUW is well-suited for small footprint applications. Package W (Typ) x D (Typ) x H (Max) Features Integrated RAM for Display Data (DDRAM) : 31 4bit (Max 124 Segments) LCD Drive Output : 4 Common output, Max 31 Segment output Integrated Buffer AMP for LCD Driving Integrated Oscillator Circuit No external Components Low Power Consumption Design VBGA049W040A Applications 4.00mm x 4.00mm x 0.80mm Metering Home Automation Goods White Goods Small Appliances Healthcare Products Battery Operated Products etc. Typical Application Circuit VDD (Note 1) VDD COM0 C 0.1F COM1 VLCD COM2 COM3 INHb CSB Controller Segment SD LCD SCL SEG2 SEG3 OSCIN TEST VSS SEG32 (Note 1) Insert Capacitors between VDD and VSS 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 TSZ02201-0P4P0D301492-001-1-2 2016 ROHM Co., Ltd. All rights reserved. 1/26 TSZ2211114001 01.Apr.2020 Rev.003 ObsoleteObsolete BU9795BGUW MAX 124 Segments (SEG31COM4) Block Diagrams / Pin Configurations / Pin Description COM 0 COM 3 SEG2 SEG 32 1 2 3 4 5 6 7 VDD LCD voltage generator Common Segment A (NC) TEST SCL OSCIN VLCD COM2 (NC) Driver Driver (NC) INHb SD VSS COM1 COM0 B VDD LCD BIAS SELECTOR C SEG4 SEG3 SEG2 CSB COM3 SEG32 SEG31 Common Blink Timing DDRAM Counter Generator D SEG 7 SEG6 SEG8 SEG5 SEG30 SEG28 SEG29 VLCD SEG9 SEG10 SEG14 SEG19 SEG25 SEG27 SEG26 E Command Command OSCIN Register Data Decoder OSCILLATOR Power ON Reset Serial Interface SEG12 SEG16 SEG17 SEG21 SEG23 SEG24 F SEG11 IF FILTER (NC) SEG13 SEG15 SEG18 SEG20 SEG22 G (NC) VSS CSB TEST SD SCL Figure 3. Block Diagram Figure 4. Pin Configuration (TOP VIEW) Table 1. Pin Description Pin Name I/O Function Handling when unused Input pin for turn off display INHb I VDD H : turn on display L : turn off display POR enable setting (Note) TEST I VSS VDD: POR disenable VSS: POR enable Input pin for external clock OSCIN I External clock and Internal clock can be changed by command. VSS Must be connected to VSS when using internal oscillation circuit. SD I Serial data input - SCL I Serial data transfer clock - CSB I Chip select : L active - VSS - Ground - VDD - Power supply - VLCD I Power supply for LCD driving - SEG2 to 32 O Segment output for LCD driving OPEN COM0 to 3 O Common output for LCD driving OPEN (Note) This function is guaranteed by design, not tested in production process. Software Reset is necessary to initialize IC in case of TEST=VDD. www.rohm.com TSZ02201-0P4P0D301492-001-1-2 2016 ROHM Co., Ltd. All rights reserved. 2/26 TSZ2211115001 01.Apr.2020 Rev.003 ObsoleteObsolete