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LCD Driver



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BL55070 데이터시트, 핀배열, 회로
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 데이터시트, 핀배열, 회로
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
18-441-8
Pin name
SDA
SCI
Vdd
Vss
Vlcd
Com0Com2Com1Com3
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, Oscillator, display RAM,
Timing, Display latch, Shift register, Common/segment outputs, input/output bank selector,
Blinker, Data pointer, etc.
2.display function decription
The display RAM is a static 35x 4-bit RAM which stores LCD data. A logic 1 in the
RAM bit-map indicates the on state of the corresponding LCD segment; similarly, a logic 0
indicates the off state. There is a one-to-one correspondence between the RAM addresses and
the segment outputs, and between the individual bits of a RAM word and the common
outputs. (see Fig.2).
COM
(Com0~
Com3)
输出
Display RAM address and SEGMENTS0~S34output
0 1 2 3 。 。 。 。 31 32 33
0
1
2
3
Fig2
34
When display data is transmitted to the BL55070, the display bytes received are stored
in the display RAM in accordance with the selected LCD drive mode. To illustrate the filling
order, an example of a 7-segment numeric display showing all drive modes is given in Fig.3;
the RAM filling organization depicted applies equally to other LCD types.
2




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