Datasheet Multi-function LCD Segment Drivers BU97981xxx Series MAX 196 Segments (SEG49xCOM4) Features Key Specifications Integrated RAM for Display Data (DDRAM): Supply Voltage Range: +1.8V to +3.6V 49 x4 Bit (Max 196 Segment) LCD Drive Power Supply Range: +3.3V to +5.5V LCD Drive Output: Operating Temperature Range: -30C to +75C 4 Common Output, Max 49 Segment Output Max Segments: Integrated 3ch LED Driver Circuit BU97981KV 196 Segments Segment/ LED (Max 3port) Output Mode Selectable BU97981MUV 168 Segments Segment/ GPO (Max 31port) Output Mode BU97981GU 196 Segments Selectable Max GPO Outputs: Support PWM Generation from Ext. or Internal BU97981KV 31port Clock BU97981MUV 27port (Resolution: 8bit Mode/12bit Mode Selectable) BU97981GU 31port Support Standby Mode Max LED Drive Outputs: Integrated Power-on-Reset Circuit (POR) BU97981KV 3port Integrated Oscillator Circuit BU97981MUV 3port No External Component BU97981GU 3port Low Power Consumption Design Display Duty: Static. 1/3, 1/4 Selectable Independent Power Supply for LCD Driving Bias: Static, 1/3 Support Blink Function Integrated Regulator for LCD Drive: (Blink Frequency 1.6, 2.0, 2.6, 4.0Hz selectable) 3.2, 3.3, 3.4, 4.4, 4.5, 4.6, 5.0V Selectable Interface: 3wire Serial Interface Applications Telephone FAX Portable Equipment (POS, ECR, PDA etc.) DSC DVC Car audio Home Electrical Appliance Meter Equipment etc. Typical Application Circuit BU97981KV LED/GPO using case LED : 3port GPO : 5port LCD :164seg VLED *Reading resistor value Please detect the value according to inpu curremt value. (cuurent MAX = 20mA) VLCD SEG48 (LED1) VDD SEG47 (LED2) SEG46 (LED3) Other SEG45(GPO1) to BU97981KV device SEG41(GPO5) 5.0V 3.3V VSS1 SEG0 to SEG40 VSS2 TEST1 SD INHb CLKIN CSB SCL LCD COM0 to COM3 CLKIN Extenal CLK input terminal In case being unused, connect to Input signal from cintroller VSS or be opened. Figure 1. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays. www.rohm.com TSZ02201-0A2A0D300110-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/46 TSZ22111 14 001 04.Feb.2019 Rev.007 Datasheet BU97981xxx Series MAX 196 segments (SEG49xCOM4) Block Diagram / Pin Arrangement / Pin Description BU97981KV COM0COM3 SEG0 SEG48 VSS2 VLCD LCD voltage common Segment Segment Segment Generator driver driver driver/GPO driver/LED 49 32 Ref Voltage SEG36 SEG19 Circuit SEG37 SEG18 Vreg GPO/LED SEG38 SEG17 Controller LCD BIAS SEG39 SEG16 SELECTOR SEG40 SEG15 common blink timing SEG41 SEG14 DDRAM counter generator PWM GPO data latch SEG42 SEG13 Generator SEG43 SEG12 SEG44 SEG11 SEG45 SEG10 VSS SEG46 SEG9 SEG47 SEG8 INHb Command register SEG48 SEG7 Data Decoder VSS2 SEG6 CLKIN OSCILLATOR Power On Reset PWMOUT SEG5 serial inter face CLKIN SEG4 64 17 Output VDD Controller IF FILTER VSS TEST1 CSB SD SCL PWMOUT Figure 2. Block Diagram Figure 3. Pin Configuration (TOP VIEW) Table 1. Pin Description Terminal Terminal I/O Unused case Function number CSB 1 I - Chip select: active SCL 2 I - Serial data transfer clock SD 3 I - Input serial data VDD 4 - - Power supply for LOGIC External clock input terminal (for display/PWM using selectable) CLKIN 64 I OPEN / VSS Support Hi-Z input mode at internal clock mode TEST1 5 I - TEST terminal (Please connect VSS terminal) VSS1 6 - - GND VLCD 8 - - Power supply for LCD Display turning on/off select terminal H: turning on display, L: turning off display INHb 7 I VDD INHb = L: All SEG/COM terminal : output VSS level GPO terminal : output VSS level LED drive terminal : output Hi-Z PWMOUT 63 O OPEN PWM output for LED2 group COM0 to 3 9 to 12 O OPEN COMMON output for LCD SEG0 to 14 13 to 27 O OPEN SEGMENT output for LCD SEG15 to 45 28 to 58 O OPEN SEGMENT output for LCD/GPO SEG46 to 48 59 to 61 O OPEN SEGMENT output for LCD/LED driver VSS2 62 - GND GND (for SEG46-48 / LED driver) www.rohm.com TSZ02201-0A2A0D300110-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/46 TSZ22111 15 001 04.Feb.2019 Rev.007 11 1616 48 CSB SEG35 SCL SEG34 SD SEG33 VDD SEG32 TEST1 SEG31 VSS1 SEG30 INHb SEG29 VLCD SEG28 COM0 SEG27 COM1 SEG26 COM2 SEG25 COM3 SEG24 SEG0 SEG23 SEG1 SEG22 SEG2 SEG21 SEG3 SEG20 33