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AS1123-BTST 参数 Datasheet PDF下载

AS1123-BTST图片预览
型号: AS1123-BTST
PDF下载: 下载PDF文件 查看货源
内容描述: 恒-cur租金, 16 -Channe升LED医生艾弗的Wi日DIAGNOST集成电路 [Constant -Cur rent , 16 -Channe l LED Dr iver wi th Diagnost ics]
分类和应用:
文件页数/大小: 25 页 / 2230 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1123  
Datasheet ꢀ Detailed Description  
Figure 13. Switching Global Error Mode Timing Diagram  
tTESTING  
OEN  
tGSW(ERROR)  
tGSW(ERROR)  
tSU(ERROR)  
LD  
tP(I/O)  
tP(I/O)  
tP(I/O)  
tGSW(ERROR)  
CLK  
SDI  
TFLAG(IN)  
OFLAG(IN)  
SFLAG(IN)  
Don’t  
Care  
Don’t  
Care  
Do
Care  
SDO  
TFLAG  
OFLAG  
SFLAG  
tP4  
tSW(ERR)  
tSW(ERROR)  
Acquisition of  
Error Status  
Error-Detection Mode  
Acquisition of the error status occurs at the rising edge of OEN. Errorꢀdetection mode is starteon the rising edge of LD when OEN is high. The  
CLK signal must be low when entering error detection mode. Error etection for openꢀ hortedꢀLEDs can only be performed for LEDs that  
are switched on during test time. To switch between erorꢀdtection modes clock pulsere eeded (see Table 5).  
Note: To test all LEDs, a test pattern that turns n all EDs must be input to the S1123.  
Global Error Mode  
Global error mode is entered when errorꢀdetecn mode is started. ulses during this period are used to select between temperature,  
openꢀLED, and shortedꢀLED tests, as well as lowꢀcurrent diagnostic mand shutdown mode (see Table 5). In global error mode, an error flag  
(TFLAG, OFLAG, SFLAG) is delivered to pin SDO if any errorare encountered.  
Table 5. Global Error Mode Selections  
Clock  
Output Port  
Don't Care  
Enabled  
Error-Detection ode  
OverꢀTemerature Detection  
OpenLED Detection  
Global Error Flag/Shutdown Condition  
TFLAG = SDO = 1: No overꢀtemperature warning.  
TFLAG = SDO = 0: Overꢀtemperature warning.  
OFLAG = SDO = 1: No openꢀLED error.  
OFLAG = SDO = 0: OpenꢀLED error.  
Pulses  
0
1
SFLAG = SDO = 1: No shortedꢀLED error.  
SFLAG = SDO = 0: ShortedꢀLED error.  
2
3
4
Enabled  
Don't Care  
Do't Cae  
ShortedꢀLED Detection  
LowꢀCurrent Diagnostic Mode  
VTHH Level  
SDI = 1: Level1, VTHH set to 54% VDD (default)  
SDI = 0: Level2, VTHH set to 80% VDD  
Nte: For a valid result SDI must be 1 for the first device.  
If there are multiple AS1123s in a chain, the error flag will be gated through all devices. To get a valid result at the end of the chain, a logic 1 must  
be applied to the SDI input of the first device of the chain. If one device produces an error this error will show up after n*tP(I/O) + tSW(ERROR) at  
pin SDO of the last device in the chain. This means it is not possible to identify which device in the chain produced the error. Therefore, if a global  
error occurs, the detailed error report can be run to identify which AS1123, or LED produced the error.  
Note: When no error has occurred, the detailed error report can be skipped, setting LD and subsequently OEN low.  
www.austriamicrosystems.com/LEDꢀDriverꢀICs  
Revision 1.00  
10 ꢀ 24