BU97941FV-E2 ROHM

Datasheet Multifunction LCD Segment Driver BU97941FV MAX 104 segments (SEG26COM4) Features Key Specifications Integrated RAM for display data (DDRAM): Supply Voltage Range: +1.8V to +3.6V 26 x 4 bit (Max 104 Segments) LCD drive power supply Range: +2.7V to +5.5V LCD drive output: Operating Temperature Range: -40C to +85C 4 Common output, 26 Segment output Max Segments: 104 Segments Integrated 4ch LED driver circuit Display Duty: Static, 1/3, 1/4 selectable Support standby mode Bias: Static, 1/3 Integrated Power-on-Reset circuit (POR) Interface: 3wire serial interface Integrated Oscillator circuit No external component Low power consumption design Package W (Typ.) x D (Typ.) x H (Max.) Independent power supply for LCD driving 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 VLED=5.0V *About resistor value: Determine the optimal valu e based on the applied curre nt With 25mA as max per 1 por t VLCD LED1 LED2 VDD LED3 BU97941FV LED4 LCD BU97941FV 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 is not designed for protection against radioactive rays. www.rohm.com TSZ02201-0A0A2D300080-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/23 TSZ2211114001 10.Apr.2015 Rev.004 21 40 20 1 BU97941FV 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 SEG11 LCD 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 LED1 SEG25 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 Chip select: active CSB 26 I VDD SCL 27 I VSS Serial data transfer clock SD 28 I VSS Input serial data VDD 29 - - Power supply for LOGIC External clock input terminal (for display/PWM using VSS 25 - - selectable) Support Hi-Z input mode at internal clock mode VLCD 30 - - GND Power supply for LCD COM0 to 3 31 to 34 O OPEN 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 TSZ02201-0A0A2D300080-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/23 TSZ2211115001 10.Apr.2015 Rev.004