Hello All,
I plan to re-use a leftover display board with 4x dual alphanumeric display LA5422-11. Each dual display is driven by one SAA1064 LED driver in dynamic mode (total 4xSAA1064T). I don´t have any idea where from this board is issued and obviously no diagram. In order to identify this board some 3 lines labellings exist on the track side stating:
FRONT 430 LS 03681156
4303 012 6577.1 6577.1
6577.1
On the components side additional components exist
. It is obvious the device was intended to be used as combined remote controlled IR-receiver and display. But for which purpose was it designed, to which equipment was it connected?
Looking carefully at the board tracks and pinnings, one can say:
I plan to re-use a leftover display board with 4x dual alphanumeric display LA5422-11. Each dual display is driven by one SAA1064 LED driver in dynamic mode (total 4xSAA1064T). I don´t have any idea where from this board is issued and obviously no diagram. In order to identify this board some 3 lines labellings exist on the track side stating:
FRONT 430 LS 03681156
4303 012 6577.1 6577.1
6577.1
On the components side additional components exist
- one mini-push button marked "up"
- one mini-push button marked "down"
- one infra-red receiver marked "TSOP1730" + 1x 4,7μF capacitor
- one 8 pins connector.
Looking carefully at the board tracks and pinnings, one can say:
- the pinnings correspondence of the drivers and the displays is as follows:
SAA1064 LA5422-11
pin segment
3 F
4 H
5 I
6 J
7 G1
8 A
9 B
10 C
15 Dp
16 D
17 G2
18 K
19 L
20 M
21 E
pin segment
3 F
4 H
5 I
6 J
7 G1
8 A
9 B
10 C
15 Dp
16 D
17 G2
18 K
19 L
20 M
21 E
- the other pins of SAA1064 are connected as per data sheet.
- Each SAA1064 is configured in dynamic mode because each is equipped with 2 x BC847 smd transistors and C.ext smd capacitor. That's explain why 1 display use 2 sets of segment output.
- does anyone have some idea of what is this stuff?
- how one 14 segment display could be driven with 2 segment output from the SAA1064?