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PDF BL55087 Data sheet ( Hoja de datos )

Número de pieza BL55087
Descripción LCD Driver
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No Preview Available ! BL55087 Hoja de datos, Descripción, Manual

BL55087
Shanghai Belling Corp., Ltd
zip: 200233 Tel: 86-021-64850700 Fax: 86-021-64855865
LCD Driver for 160 Display Units BL55087
The BL55087 is a general COG LCD driver IC for 160 units LCD panel. It features a wide
operating supply voltage range, incorporates simple communication interface with
microcomputer and is suitable for multiple application.
1.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
I2C data interface
● 160(40x4) Display Units
● Low power dissipation design: Power saving mode: Idd=14uA at 5V and
Idd=9uA at 3.3V; Sleeping mode: Idd<2uA
● Maybe cascaded up to 2PCs for large LCD applications
● On-chip RC oscillator
● VLCD for adjusting LCD operating voltage
Excellent EMC immunity
Compatible with general microcomputer
Package: COG
2.Pin Description
Pin No.
1~4
5~44
45,46
47,48
49,50
51
52
53~57
58
59
60~64
65~69
70
71
72
73
Pin name
BP0~BP3
S0~S39
NC
SDA
SCL
SYNC
CLK
Vdd
OSC
A0
Vss
Vlcd
CLK
SYNC
SCL
SDA
Function
BP terminal driving output
Segment terminal driving output
Serial data input/output
Serial clock input
Cascade synchronization clock
External clock input
OSC=0:outputOSC=1:input
Supply voltage
internal oscillator enable input
Subaddress inputs
ground
LCD supply voltage
External clock input
OSC=0:outputOSC=1:input
Cascade synchronization clock
Serial clock input
Serial data input/output
BL55087 Version 1.0
1

1 page




BL55087 pdf
BL55087
Shanghai Belling Corp., Ltd
zip: 200233 Tel: 86-021-64850700 Fax: 86-021-64855865
3.BLOCK DIAGRAM
4.Function Description
1. function circuit
The BL55087 has all function circuits that can directly drive any static or multiplexed
LCD containing up to four commons and up to 40 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, Subaddress counter,etc.
2. display function description
The display RAM is a static 40x 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).
BL55087 Version 1.0
5

5 Page





BL55087 arduino
BL55087
Shanghai Belling Corp., Ltd
zip: 200233 Tel: 86-021-64850700 Fax: 86-021-64855865
2/ cascade application
LCD PANEL
open-
circuit
S
3
9
S
0
BB
PP
30
S
D
A
S
C
L
S
Y
N
C
CV
LD
KD
O
S
C
A
0
V
S
S
V
C
L
D
C
L
K
S
YSS
NCD
CLA
S
3
9
S
0
BB
PP
30
S
D
A
S
C
L
S
Y
N
C
CV
LD
KD
O
S
C
A
0
V
S
S
V
CC
LL
DK
S
Y
N
C
S
C
L
S
D
A
V
D
D
MCU CLK
(optional)
VV
SC
SL
D
Cascaded con iguration
V
D
D
VV
SC
SL
D
N
BL55087 Version 1.0
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