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AS1123-BTST Datasheet(PDF) 9 Page - ams AG |
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AS1123-BTST Datasheet(HTML) 9 Page - ams AG |
9 / 25 page 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 tSU(L) tH(L) tW(L) tW(CLK) tP1 tH(D) 50% 50% 50% 50% 50% 50% tSU(D) OEN Low = Output Enabled tP2 OUTNx High = Output Off OUTNx Low = Output On 50% 50% 50% tW(OE) tP3 OEN OUTN0:15 50% 50% 50% 50% tOF tOR 90% 90% 10% 10% tP3 |
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