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AS1121 Datasheet(PDF) 18 Page - ams AG

Part # AS1121
Description  16-Channel LED Driver with Dot Correction and Greyscale PWM
PDF  22 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS1121 Datasheet(HTML) 18 Page - ams AG

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www.austriamicrosystems.com/AS1121
Revision 1.01
17 - 21
AS1121
Datasheet - Detailed Descr i pti on
Serial Data Transfer Rate
Figure 25 shows a cascaded arrangement AS1121 devices connected to a controller, building a basic module of an LED display system.
Figure 25. Cascaded Configuration
The maximum number of cascading AS1121 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:
Where:
fGSCLK is the minimum frequency needed for GSCLK;
fUPDATE is the update rate of whole cascaded system.
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 AS1121 devices.
VCC
LD
GSCLK
MODE
OEN
SDO
AS1121
100nF
SDI
XERR
CLK
GND
VCC
...
LD
GSCLK
MODE
OEN
SDO
OUT15
OUT0
AS1121
SDI
XERR
CLK
...
...
SIN
XERR
CLK
LD
GSCLK
MODE
OEN
OUT15
OUT0
SOUT
6
VCC
100kΩ
VLED
VLED
VLED
VLED
Controller
VCC
VCC
100nF
GND
VCC
VCC
IREF
IREF
fGSCLK = 4096 x fUPDATE
(EQ 5)
(EQ 6)
fCLK = 193 x fUPDATE x n



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