SA8803 Sames, SA8803 Datasheet - Page 4

• Manufacturer Part Number: SA8803
• Description: LIGHT EMITTING DIODE DRIVER
• Manufacturer: Sames

FUNCTIONAL DESCRIPTION
1.
FIGURE 2: CONTROL WORD STRUCTURE
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SA8803
Control Word
The control word written serially into the DATA pin, will contain 9 information bits.
The data structure is illustrated in Figure 2 below.
Because the chip address is 3 bits wide, a single chip controller will be able to
address 8 SA8803 devices. Each SA8803 can drive 24 LED's, which means that
the controller is capable of addressing 192 LED's. The address bits in the control
word are internally compared with the address on the AD0..AD2 address lines to
determine if the SA8803 is being addressed.
Table 1. LED Addresses
As can be seen from the structure of the control word, the controller should send 1
start bit, 9 data bits, and 1 stop bit.
When a LED is addressed its state will be set according to the status bit. A logic
one will enable the LED, and a logic zero will disable the LED.
SB
L1 ... L5
A0 ... A2
E
S
DR-00595
L5
0
0
0
1
1
1
SB
L1
=
=
=
=
=
L2
L4
START BIT
LED BIT ADDRESS INSIDE BANK
DEVICE BIT ADDRESS
END BIT
STATUS BIT
0
0
0
1
1
1
L3
9-BIT CONTROL WORD
L4
etc
L3
0
0
0
0
0
1
L5
S
A0
L2
A1
0
0
1
0
0
1
A2
E
L1
0
1
0
0
1
1
SB
IGNORED
IGNORED
LED
24
1
2