AS2590P AMSCO [austriamicrosystems AG], AS2590P Datasheet - Page 6

• Manufacturer Part Number: AS2590P
• Description: LC DISPLAY DRIVER WITH 18 DIGITS, 6 SYMBOLS AND CLOCK/TIMER
• Manufacturer: AMSCO [austriamicrosystems AG]

Data Sheet
BP0
BP1
BP2
BP3
Serial Interface
The serial interface is a one way, two line link between
the dialler (AS2574) and the display driver. The two lines
are the serial data line (SDA) and the serial clock line
(SCL). The display driver can only receive data.
Word Transfer:
Data are transferred as 5 bit words with start and stop bit.
the least significant bit is sent first after the start bit. As
long as there is no data transfer, both data and clock
lines have to remain high. Also between two words both
lines have to stay high for a specified time. Figure 4
shows the timing of the serial interface.
Start and Stop Conditions:
A start condition is detected when the data line goes
from high to low while the clock line is held high. A low
Rev. 1
S0
S1
SDA
SCL
BP0
on
off
START
#1
Figure 3 LCD driver outputs
BP1
off
on
Active Backplane
LSB
BP2
B0
off
on
BP3
off
on
B1
Figure 4 Interface Timing
B2
V
V
V
Vss
V
V
V
Vss
V
V
V
Vss
V
V
V
Vss
V
V
V
Vss
V
V
V
Vss
DD
2/3
1/3
DD
2/3
1/3
DD
2/3
1/3
DD
2/3
1/3
DD
2/3
1/3
DD
2/3
1/3
B3
6
to high transition of the data line while the clock line is
high followed by a negative clock pulse indicates a stop
condition (see figure 4).
NO SYMBOL MSB
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
2
3
4
5
6
7
8
9
MSB
SET CLOCK
B4
SB0-on
SB0-off
SB1-on
SB1-off
SB2-on
SB2-off
START
BLANK
TIMER
COPY
TEST
FIFO
Table 4 Codes for Serial Interface
P/T
0
1
2
3
4
5
6
7
8
9
a
b
c
d
#
–
*
r
0
0
1
0
0
1
0
0
0
1
1
1
1
1
0
0
0
1
1
1
0
0
0
0
1
0
1
1
1
1
1
0
STOP
#1
B3
0
0
0
1
0
1
1
1
1
0
0
1
0
1
0
0
0
0
0
0
1
1
1
0
0
1
1
1
1
1
1
0
B2
1
0
0
0
1
1
0
1
1
0
1
1
1
1
0
1
0
0
1
0
0
1
0
1
1
1
1
0
0
0
0
0
WORD
GAP
B1
0
1
0
0
1
1
1
0
1
1
0
0
1
0
0
0
1
0
0
1
0
0
1
1
1
1
1
0
1
1
0
0
START
AS2590
LSB HEX
Dec. 1993
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
#2
0D
1D
1C
0C
1F
0B
0F
0A
0E
1E
1A
1B
05
03
11
09
07
13
15
17
00
04
02
10
14
12
08
06
16
18
19
01