Datasheet MAX 104 segments (SEG26COM4) Multifunction LCD Segment Driver BU97941FV-LB This is the product guarantees long time support in Industrial market. Key Specifications Supply Voltage Range: +1.8V to +3.6V Features LCD Drive Power Supply Range: +2.7V to +5.5V Long Time Support Product for Industrial Operating Temperature Range: -40C to +85C Applications. Max Segments: 104 Segments Integrated RAM for Display Data (DDRAM): Display Duty: Static, 1/3, 1/4 Selectable 26 x 4 bit (Max 104 Segments) Bias: Static, 1/3 LCD Drive Output: Interface: 3wire Serial Interface 4 Common Output, 26 Segment Output Integrated 4ch LED Driver Circuit Support Standby Mode Package W (Typ.) x D (Typ.) x H (Max.) Integrated Power-On-Reset Circuit (POR) Integrated Oscillator Circuit No External Component Low Power Consumption Design Independent Power Supply for LCD Driving Applications Industrial Equipment Telephone FAX Portable Equipment (POS, ECR, PDA etc.) DSC SSOP-B40 DVC 13.60mm x 7.80mm x 2.00mm Car Audio Home Electrical Appliance Meter Equipment Etc. Typical Application Circuit VLED=5.0 About resistor value: Determine the optimal value based on the applied current With 25mA as max per 1 port VLCD LED1 LED2 VDD LED3 LED4 LCD BU97941FV-LB 5.0V 3.3V SEG0 to SEG25 VSS CSB SD SCL COM0 to COM3 Signal input from controller Figure 1. Typical application circuit Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays. www.rohm.com TSZ02201-0P4P0D300500-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/23 TSZ2211114001 26.Feb.2014 Rev.00221 40 20 1 DatasheetDatasheet BU97941FV-LB MAX 104 segments (SEG26COM4) Block Diagram / Pin Configuration / Pin Description COM0COM3 SEG0SEG25 LED4...LED1 SEG6 SEG5 SEG7 SEG4 VLCD SEG8 SEG3 common Segment LED LCD voltage driver driver Driver Generator SEG9 SEG2 SEG10 SEG1 LCD SEG11 SEG0 BIAS SELECTOR SEG12 COM3 common DDRAM SEG13 COM2 counter SEG14 COM1 SEG15 COM0 VSS SEG16 VLCD SEG17 VDD Command register Data Decoder SEG18 SD OSCILLATOR Power On Reset serial inter face SEG19 SCL SEG20 CSB VDD External clock line IF FILTER SEG21 VSS VSS LED4 SEG22 CSB SD SCL/CLKIN LED3 SEG23 SEG24 LED2 SEG25 LED1 Figure 2. Block Diagram Figure 3. Pin Configuration (TOP VIEW) Table 1. Pin Description Setting Pin Name Pin No. I/O when not in Function use CSB 26 I VDD Chip select: active Serial data transfer clock SCL 27 I VSS SD 28 I VSS Input serial data Power supply for LOGIC VDD 29 - - External clock input terminal (for display/PWM using selectable) VSS 25 - - Support Hi-Z input mode at internal clock mode GND VLCD 30 - - COM0 to 3 31 to 34 O OPEN Power supply for LCD 1 to 20 SEG0 to 25 O OPEN COMMON output for LCD 35 to 40 LED1 to 4 21 to 24 O OPEN LED driver output www.rohm.com TSZ02201-0P4P0D300500-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/23 TSZ2211115001 26.Feb.2014 Rev.002