Datasheet Multifunction LCD Segment Driver BU97931FV MAX 112 segments (SEG28COM4) Features Key Specifications Integrated RAM for display data (DDRAM): Supply Voltage Range: +1.8V to +3.6V 28 x 4 bit (Max 112 Segment) LCD drive power supply Range: +2.7V to +5.5V LCD drive output: Operating Temperature Range: -40C to +85C 4 Common output, Max 28 Segment output Max Segments: 112 Segments Integrated 1ch LED driver circuit Display Duty: Static, 1/3, 1/4 selectable Segment/GPO (Max 5port) output mode selectable Bias: Static, 1/3 Support PWM generation from ext. or internal clock Interface: 3wire serial interface (Resolution: 8bit) 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 Support Blink function (Blink frequency 1.6, 2.0, 2.6, 4.0Hz selectable) Applications Telephone FAX Portable equipment (POS, ECR, PDA etc.) SSOP-B40 DSC 13.60mm x 7.80mm x 2.00mm DVC Car audio Home electrical appliance Meter equipment etc. Typical Application Circuit LED/GPO using case VLED = 5 . 0V * Regarding resistor value Please detect the value according to input current value ( current MAX = 20 mA) VLCD LED VDD Other SEG 27 ( GPO 0) to device SEG 23 ( GPO 4 BU9 7931FV . 0 V 3 . 3 V SEG0 to SEG 22 VSS CSB SD SCL CLKIN LCD to COM 0 COM3 CLKIN External CLK input terminal Input signal from controller In case being unused , c onnect to VSS or be opened . Figure 1. Typical application circuit Product structureSilicon monolithic integrated circuit This product is not designed for protection against radioactive rays. www.rohm.com TSZ02201-0A0A2D300070-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/28 TSZ2211114001 10.Apr.2015 Rev.004 40 21 1 20 BU97931FV MAX 112 segments (SEG28COM4) Block Diagram / Pin Configuration / Pin Description SEG5 SEG4 SEG6 SEG3 COM0COM3 SEG0..22, SEG2327 LED SEG7 SEG2 SEG8 SEG1 VLCD common Segment Segment LED LCD voltage SEG9 SEG0 driver driver driver/GPO Driver Generator COM3 SEG10 COM2 SEG11 GPO Controller LCD COM1 SEG12 BIAS SELECTOR COM0 SEG13 common blink timing DDRAM counter generator PWM GPO data latch SEG14 VLCD Generator SEG15 CLKIN VSS VDD SEG16 SEG17 SD Command register Data Decoder SEG18 SCL CLKIN OSCILLATOR SEG19 CSB Power On Reset serial inter face SEG20 VSS VDD SEG21 LED IF FILTER VSS SEG22 SEG27 SEG23 SEG26 CSB SD SCL SEG24 SEG25 Figure 2. Block Diagram Figure 3. Pin Configuration (TOP VIEW) Table 1 Pin Description Terminal Unused Terminal I/O Function number case CSB 26 I - Chip select: active SCL 27 I - Serial data transfer clock SD 28 I - Input serial data VDD 29 - - Power supply for LOGIC External clock input terminal (for display/PWM using selectable) CLKIN 30 I OPEN / VSS Support Hi-Z input mode at internal clock mode VSS 25 - - GND VLCD 31 - - Power supply for LCD COM0 to 3 32 to 35 O OPEN COMMON output for LCD 36 to 40 SEG0 to 22 O OPEN SEGMENT output for LCD 1 to 18 SEG23 to 27 19 to 23 O OPEN SEGMENT output for LCD/GPO LED 24 O OPEN LED driver output www.rohm.com TSZ02201-0A0A2D300070-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/28 TSZ2211115001 10.Apr.2015 Rev.004