www.austriamicrosystems.com/LED-Driver-ICs

Revision 1.00

8 - 24

AS1123

Datasheet - D e t a i l e d D e s c r i p t i o n

Serial Interface

Data accesses are made serially via pins SDI and SDO. At each CLK rising edge, the signal present at pin SDI is shifted into the first bit of the

internal shift register and the other bits are shifted ahead of the first bit. The MSB is the first bit to be clocked in. In error-detection mode the shift

register will latch-in the corresponding error data of temperature-, open-, and short-error register with each falling edge of LD.

The 16-bit data register will latch the data of the shift register at each rising edge of LD. This data is then used to drive the current generator out-

put drivers to switch on the corresponding LEDs as OEN goes low.

Timing Diagrams

This section contains timing diagrams referenced in other sections of this data sheet.

Figure 9. Normal Mode Timing Diagram

Figure 10. Output Delay Timing Diagram

OEN

OUTNx

LD

SDO

SDI

CLK

50%

50%

50%

50%

50%

50%

OEN Low = Output Enabled

OUTNx High = Output Off

OUTNx Low = Output On

50%

50%

50%

OEN

OUTN0:15

50%

50%

50%

50%

90%

90%

10%

10%