www.austriamicrosystems.com/LED-Driver-ICs/AS1112

Revision 1.13

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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

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:

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 AS1112 devices.

IREF

VCC

LD

GSCLK

MODE

OEN

SDO

AS1112

100nF

SDI

XERR

CLK

GND

VCC

...

LD

GSCLK

MODE

OEN

SDO

OUT15

OUT0

AS1112

SDI

XERR

CLK

...

...

SIN

XERR

CLK

LD

GSCLK

MODE

OEN

OUT15

OUT0

SOUT

6

VCC

100k

Ω

VLED

VLED

VLED

VLED

Controller

TEST

IREF

VCC

100nF

GND

VCC

TEST

fGSCLK = 4096 x fUPDATE

(EQ 5)

(EQ 6)

fCLK = 193 x fUPDATE x n