BL55070

BL55070 Shanghai Belling Corp., Ltd zip: 200233 Tel: 86-021-64850700 Fax: 86-021-64855865 LCD Driver for 140 Display Units BL55070 1 General Description The BL55070 is a general LCD driver IC for 140 units LCD panel. It features a wide operating supply voltage range, incorporates simple communication interface with microcomputer and is suitable for multiple application. 2 Features Advanced low power CMOS Technology Selection of 1/2 or 1/3 bias, selection of 1/2 or 1/3 or 1/4 duty. Operation voltage: 2.5~5.5V Serial data interface 140(35x4) Display Units Low power dissipation design: Power saving mode: Idd=14uA at 5V and Idd=9uA at 3.3V; Sleeping mode: Idd<2uA On-chip RC oscillator VLCD for adjusting LCD operating voltage Excellent EMC immunity Compatible with general microcomputer LQFP44 package 3 Pin Assignment Fig 1 1 BL55070 Shanghai Belling Corp., Ltd zip: 200233 Tel: 86-021-64850700 Fax: 86-021-64855865 4 Pin Description Pin No. 9 10 11 12 13 14-17 18-44、1-8 Pin name SDA SCI Vdd Vss Vlcd Com0、Com2、Com1、Com3 S0——S34 Function Serial data input/output Serial clock input Supply voltage ground LCD supply voltage Common terminal driving output Segment terminal driving output Tab.1 5 Function Description 1.function circuit The BL550070 has all function circuits that can directly drive any static or multiplexed LCD containing up to four commons and up to 35 segments. The function circuits include:Power-on reset, LCD bias generator, LCD voltage selector, Oscillato...