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AS1112
Datasheet - D e t a i l e d D e s c r i p t i o n
Serial Data Transfer Rate
Figure 17 shows a cascaded arrangement AS1112 devices connected to a controller, building a basic module of an LED display system.
Figure 17. Cascaded Configuration
100k ?
V CC
V LED
...
V LED
V LED
...
V LED
OUT0
OUT15
...
OUT0
OUT15
SIN
XERR
CLK
SDI
XERR
CLK
SDO
V CC
V CC
SDI
XERR
CLK
SDO
V CC
V CC
LD
GSCLK
LD
GSCLK
AS1112
100nF
TEST
LD
GSCLK
AS1112
100nF
TEST
MODE
MODE
GND
MODE
GND
OEN
SOUT
OEN
I REF
OEN
I REF
Controller
6
The maximum number of cascading AS1112 devices depends on the application system and is in the range of 40 devices. The minimum fre-
quency needed can be calculated by the following equations:
f GSCLK = 4096 x f UPDATE
Where:
f GSCLK is the minimum frequency needed for GSCLK;
f UPDATE is the update rate of whole cascaded system.
f CLK = 193 x f UPDATE x n
Where:
f CLK is the minimum frequency needed for CLK and SIN;
f UPDATE is the update rate of whole cascaded system;
n is the number of cascaded of AS1112 devices.
(EQ 5)
(EQ 6)
www.austriamicrosystems.com/LED-Driver-ICs/AS1112
Revision 1.13
15 - 19
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