as1112b-bqft austriamicrosystems, as1112b-bqft Datasheet - Page 15

• Manufacturer Part Number: as1112b-bqft
• Description: 16-channel Led Driver With Dot Correction And Greyscale Pwm
• Manufacturer: austriamicrosystems

AS1112
Data Sheet - D e t a i l e d D e s c r i p t i o n
Serial Data Transfer Rate
Figure 15
LED display system.
Figure 15. Cascaded Configuration
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:
Where:
f
f
Where:
f
f
n is the number of cascaded of AS1112 devices.
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GSCLK
UPDATE
CLK
UPDATE
Controller
GSCLK
MODE
XERR
SOUT
is the minimum frequency needed for CLK and SIN;
OEN
CLK
100k
SIN
LD
is the minimum frequency needed for GSCLK;
is the update rate of whole cascaded system.
is the update rate of whole cascaded system;
Ω
shows a cascaded arrangement AS1112 devices connected to a controller, building a basic module of an
V
CC
GSCLK
MODE
XERR
OEN
CLK
SDI
LD
OUT0
V
LED
AS1112
...
6
OUT15
f
CLK
f
GSCLK
V
LED
= 193 x f
Revision 1.02
= 4096 x f
100nF
SDO
V
TEST
GND
I
REF
CC
UPDATE
V
CC
UPDATE
...
x n
GSCLK
MODE
XERR
OEN
CLK
SDI
LD
OUT0
V
LED
AS1112
...
OUT15
V
LED
100nF
SDO
V
TEST
GND
I
REF
CC
(EQ 5)
(EQ 6)
15 - 18
V
CC