AMG-SO204 Datasheet, PDF (25/30 Pages) alpha microelectronics gmbh – Optical Switch IC

AMG-SO204
Optical Switch IC
10⋅t _bit
t _bit
2650−2700 ns
CPU-RX
CPU-TX
Start
7
6
5 0 ^Stop
Adress 8 Bit to read from a9234
Start
7
6
5
0 ^{Stop Start}
7
6
5 0 ^Stop
Data 8 Bit (LSB) to read from a9234
Data 8 Bit (MSB) to read from a9234
Figure 14: read from SO204
12. LED Display Driver
An 8 digit 7-segment LED display can be connected to the IC via ROW[7:0], and SEG[7:0]. It
is controlled via registers 16, 17, 18, 19 (see register map in chapter 10). The relationship
between segment number and register bit is shown in the figure below. When a segment bit is
set the related SEG[7:0] pin is set to logic high. One line out of ROW [7:0] is set to high
sequentially to display the value of SEG[7:0] for each digit, see fig. 16 for the signal's timing.
Note: Only the dot segments of row 2 through 5 can be set. It must be observed that the flag
must be set in the registers normally associated with row 4 through 7.
SEG5
SEG4
ROW0
SEG0
SEG6
SEG3
SEG1
SEG2
SEG0 => BIT 0 / 8
SEG1 => BIT 1 / 9
SEG2 => BIT 2 / 10
SEG3 => BIT 3 / 11
SEG4 => BIT 4 / 12
SEG5 => BIT 5 / 13
SEG6 => BIT 6 / 14
SEG7
Only the dot segments of ROW2 – 5 can be set:
SEG7 => ROW2 / 3 => BIT 7 / 15 (Adresse 18)
=> ROW4 / 5 => BIT 7 / 15 (Adresse 19)
Figure 15: schematic drawing of numeric 7-segment LED
AMG-SO204 Revision: A
29. Jul. 2010 © All rights reserved Page 25 of 30