AS1112
Datasheet - Detailed Description
Serial Data Transfer Rate
Figure 15 shows a cascaded arrangement AS1112 devices connected to a controller, building a basic module of an
LED display system.
Figure 15. Cascaded Configuration
VCC
VLED
VLED
VLED
VLED
...
...
100kΩ
OUT0
OUT0
OUT15
OUT15
...
SIN
SDI
XERR
CLK
SDO
VCC
SDI
XERR
CLK
SDO
VCC
XERR
VCC
VCC
CLK
LD
100nF
100nF
LD
LD
AS1112
AS1112
GSCLK
MODE
TEST
GND
TEST
GND
GSCLK
MODE
OEN
GSCLK
MODE
OEN
OEN
SOUT
IREF
IREF
Controller
6
The maximum number of cascading AS1112 devices depends on the application system and is in the range of 40
devices. The minimum frequency needed can be calculated by the following equations:
fGSCLK = 4096 x fUPDATE
(EQ 5)
Where:
fGSCLK is the minimum frequency needed for GSCLK;
fUPDATE is the update rate of whole cascaded system.
fCLK = 193 x fUPDATE x n
(EQ 6)
Where:
fCLK is the minimum frequency needed for CLK and SIN;
fUPDATE is the update rate of whole cascaded system;
n is the number of cascaded of AS1112 devices.
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