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PDF COP472-3 Data sheet ( Hoja de datos )
| Número de pieza | COP472-3 | |
| Descripción | COP472-3 Liquid Crystal Display Controller | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 1995
COP472-3 Liquid Crystal Display Controller
General Description
The COP472–3 Liquid Crystal Display (LCD) Controller is a
peripheral member of the COPSTM family fabricated using
CMOS technology The COP472-3 drives a multiplexed liq-
uid crystal display directly Data is loaded serially and is held
in internal latches The COP472-3 contains an on-chip oscil-
lator and generates all the multi-level waveforms for back-
planes and segment outputs on a triplex display One
COP472-3 can drive 36 segments multiplexed as 3 x 12
(4 digit display) Two COP472-3 devices can be used to-
gether to drive 72 segments (3 x 24) which could be an 8
digit display
Features
Y Direct interface to TRIPLEX LCD
Y Low power dissipation (100 mW typ )
Y Low cost
Y Compatible with all COPS processors
Y Needs no refresh from processor
Y On-chip oscillator and latches
Y Expandable to longer displays
Y Operates from display voltage
Y MICROWIRETM compatible serial I O
Y 20-pin Dual-In-Line package and 20-pin SO
Block Diagram
COPSTM and MICROWIRETM are trademarks of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL DD 6932
TL DD 6932 – 1
RRD-B30M56 Printed in U S A
http www national com
1 page  
Functional Description
The COP472-3 drives 36 bits of display information orga-
nized as twelve segments and three backplanes The
COP472-3 requires 40 information bits 36 data and 4 con-
trol The function of each control bit is described below
Display information format is a function of the LCD intercon-
nections A typical segment backplane configuration is illus-
trated in Figure 5 with this configuration the COP472-3 will
drive 4 digits of 9 segments
To adapt the COP472-3 to any LCD display configuration
the segment backplane multiplex scheme is illustrated in
Table I
Two or more COP472-3 chips can be cascaded to drive
additional segments There is no limit to the number of
COP472-3’s that can be used as long as the output loading
capacitance does not exceed specification
TABLE I COP472-3 Segment Backplane
Multiplex Scheme
Bit Number
Segment
Backplane
Data to
Numeric Display
1 SA1 BPC SH
2 SB1 BPB SG
3 SC1 BPA SF
4 SC1 BPB SE
5 SB1 BPC SD
6 SA1 BPB SC
7 SA1 BPA SB
8 SB1 BPA SA
Digit 1
9 SA2 BPC SH
10 SB2 BPB SG
11 SC2 BPA SF
12 SC2 BPB SE
13 SB2 BPC SD
14 SA2 BPB SC
15 SA2 BPA SB
16 SB2 BPA SA
Digit 2
17 SA3 BPC SH
18 SB3 BPB SG
19 SC3 BPA SF
20 SC3 BPB SE
21 SB3 BPC SD
22 SA3 BPB SC
23 SA3 BPA SB
24 SB3 BPA SA
Digit 3
25 SA4 BPC SH
26 SB4 BPB SG
27 SC4 BPA SF
28 SC4 BPB SE
29 SB4 BPC SD
30 SA4 BPB SC
31 SA4 BPA SB
32 SB4 BPA SA
Digit 4
33 SC1 BPC SPA
34 SC2 BPC SP2
35 SC3 BPC SP3
36 SC4 BPC SP4
37 not used
38 Q6
39 Q7
40 SYNC
Digit 1
Digit 2
Digit 3
Digit 4
SEGMENT DATA BITS
Data is loaded in serially in sets of eight bits Each set of
segment data is in the following format
SA SB SC SD SE SF SG SH
Data is shifted into an eight bit shift register The first bit of
the data is for segment H digit 1 The eighth bit is segment
A digit 1 A set of eight bits is shifted in and then loaded into
the digit one latches The second set of 8 bits is loaded into
digit two latches The third set into digit three latches and
the fourth set is loaded into digit four latches
CONTROL BITS
The fifth set of 8 data bits contains special segment data
and control data in the following format
SYNC Q7 Q6 X SP4 SP3 SP2 SP1
The first four bits shifted in contain the special character
segment data The fifth bit is not used The sixth and sev-
enth bits program the COP472-3 as a stand alone LCD driv-
er or as a master or slave for cascading COP472-3’s BPC
of the master is connected to BPA of each slave The fol-
lowing table summarizes the function of bits six and seven
Q7 Q6 Function BPC Output BPA Output
1 1 Slave
Backplane Oscillator
Output
Input
0 1 Stand Alone Backplane Backplane
Output
Output
1 0 Not Used Internal
Oscillator
Osc Output Input
0 0 Master
Internal
Backplane
Osc Output Output
The eighth bit is used to synchronize two COP472-3’s to
drive an 8 -digit display
5 http www national com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet COP472-3.PDF ] | |
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