Datasheet Low Duty LCD Segment Driver for Automotive Application BU91797xxx-M Series MAX 144 Segments (SEG36COM4) General Description Key Specifications BU91797MUF-M and BU91797FUV-M are a 1/4 duty Supply Voltage Range: +2.5V to +6.0V general-purpose LCD driver that can be used for Operating Temperature Range: -40C to +105C automotive applications and can drive up to 144 LCD Max Segments: 144Segments Segments. Display Duty: 1/4 It can support operating temperature of up to +105C and Bias: 1/3 qualified for AEC-Q100 Grade2, as required for Interface: 2wire Serial Interface automotive applications. Wettable flank QFN package is suitable for small Special Characteristics footprint applications and provides significant ESD(HBM): 2000V advantages in inspectability and solder joint reliability. Latch-up Current: 100mA Features Package W (Typ) x D (Typ) x H (Max) (Note) AEC-Q100 Qualified Integrated RAM for Display Data (DDRAM): 36 x 4 bit (Max 144 Segment) LCD Drive Output: 4 Common Output, Max 36 Segment Output Integrated Buffer AMP for LCD Driving Integrated Oscillator Circuit No External Components Low Power Consumption Design (Note) Grade 2 VQFN48FV7070 7.0mm x 7.0mm x 1.0mm Applications Instrument Clusters Climate Controls Car Audios / Radios Metering White Goods Healthcare Products Battery Operated Applications TSSOP-C48V etc. 12.5mm x 8.1mm x 1.0mm Typical Application Circuit VDD C > 0.1F VDD COM0 VLCD COM1 COM2 COM3 SDA Controller Segment SCL LCD SEG0 SEG1 OSCIN TEST1 Insert Capacitors TEST2 between VDD and VSS VSS SEG35 Internal Clock Mode Figure 1. Typical Application Circuit Product structure : Silicon monolithic integrated circuit This product is not designed protection against radioactive rays. www.rohm.com TSZ02201-0P4P0D3P01040-1-2 2015 ROHM Co., Ltd. All rights reserved. 1/27 TSZ22111 14 001 28.Mar.2017 Rev.002 Datasheet BU91797xxx-M Series MAX 144 segments (SEG36COM4) Block Diagram / Pin Configuration / Pin Description BU91797MUF-M COM 0 COM 3 SEG 0 SEG 35 VDD LCD voltage generator Common Segment Driver Driver SEG24 COM1 37 24 COM2 38 23 SEG23 LCD BIAS COM3 39 22 SEG22 SELECTOR SEG21 VLCD 40 21 Common Blink Timing DDRAM Generator VDD 41 20 SEG20 Counter VSS 42 19 SEG19 EXT-PAD SEG18 TEST1 43 18 VLCD OSCIN 44 17 SEG17 SCL 45 16 SEG16 SDA 46 15 SEG15 Command Command OSCIN Data Decoder Register TEST2 47 14 SEG14 OSCILLATOR SEG0 48 13 SEG13 Power On Reset Serial Interface IF FILTER VSS SCL TEST1 TEST2 SDA Figure 2. Block Diagram Figure 3. Pin Configuration (TOP VIEW) Table 1. Pin Description Handling Pin Name Pin No. I/O Function when unused Test input (ROHM use only) TEST1 43 I VSS Must be connected to VSS POR enable setting (Note 1) TEST2 47 I VDD: POR disenable VSS VSS: POR enable External clock input OSCIN 44 I External clock and Internal clock can be selected by command VSS Must be connected to VSS when using internal oscillator SDA 46 I/O Serial data in-out terminal - SCL 45 I Serial clock terminal - VSS 42 - GND - VDD 41 - Power supply - VLCD 40 - Power supply for LCD driving - 1 to 35, SEG0 to SEG35 O SEGMENT output for LCD driving OPEN 48 COM0 to COM3 36 to 39 O COMMON output for LCD driving OPEN (Note 2) EXT-PAD - Substrate OPEN/VSS (Note 1) This function is guaranteed by design, not tested in production process. Software Reset is necessary to initialize IC in case of TEST2=VDD. (Note 2) To radiate heat, Contact a board with the EXT-PAD which is located at the bottom side of VQFN48FV7070 package. Supply VSS level or Open state as the input condition for this PAD. www.rohm.com TSZ02201-0P4P0D3P01040-1-2 2015 ROHM Co., Ltd. All rights reserved. 2/27 TSZ2211115001 28.Mar.2017 Rev.002 SEG1 1 36 COM0 SEG2 2 35 SEG35 SEG3 3 34 SEG34 SEG4 4 33 SEG33 SEG5 5 32 SEG32 SEG6 6 31 SEG31 SEG7 7 30 SEG30 SEG8 8 29 SEG29 SEG9 9 28 SEG28 SEG10 10 27 SEG27 SEG11 11 26 SEG26 SEG12 12 25 SEG25