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AS1109-BSSU 参数 Datasheet PDF下载

AS1109-BSSU图片预览
型号: AS1109-BSSU
PDF下载: 下载PDF文件 查看货源
内容描述: 恒流, 8位LED驱动器与诊断 [Constant-Current, 8-Bit LED Driver with Diagnostics]
分类和应用: 驱动器
文件页数/大小: 26 页 / 1003 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1109  
Data Sheet - Detailed Description  
Figure 14. Switching Global Error Mode Timing Diagram  
tTESTING  
OEN  
LD  
tGSW(ERROR)  
tGSW(ERROR)  
tSU(ERROR)  
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  
Don’t  
Care  
SDO  
TFLAG  
OFLAG  
SFLAG  
tP4  
tSW(ERROR)  
tSW(ERROR)  
Acquisition of  
Error Status  
Error-Detection Mode  
Acquisition of the error status occurs at the rising edge of OEN. Error-detection mode is started on the rising edge of  
LD when OEN is high. The CLK signal must be low when entering error detection mode. Error detection for open- and  
shorted-LEDs can only be performed for LEDs that are switched on during test time. To switch between error-detection  
modes clock pulses are needed (see Table 5).  
Note: To test all LEDs, a test pattern that turns on all LEDs must be input to the AS1109.  
Global Error Mode  
Global error mode is entered when error-detection mode is started. Clock pulses during this period are used to select  
between temperature, open-LED, and shorted-LED tests, as well as low-current diagnostic mode and shutdown mode  
(see Table 5). In global error mode, an error flag (TFLAG, OFLAG, SFLAG) is delivered to pin SDO if any errors are  
encountered.  
Table 5. Global Error Mode Selections  
Clock  
Pulses  
Output Port Error-Detection Mode  
Global Error Flag/Shutdown Condition  
TFLAG = SDO = 1: No over-temperature warning.  
TFLAG = SDO = 0: Over-temperature warning.  
OFLAG = SDO = 1: No open-LED error.  
OFLAG = SDO = 0: Open-LED error.  
Over-Temperature  
Don't Care  
0
Detection  
1
2
3
4
Enabled  
Enabled  
Open-LED Detection  
SFLAG = SDO = 1: No shorted-LED error.  
SFLAG = SDO = 0: Shorted-LED error.  
Shorted-LED Detection  
Low-Current Diagnostic  
Mode  
Don't Care  
Don't Care  
SDI = 1: Wakeup  
SDI = 0: Shutdown  
Shutdown Mode  
Note: For a valid result SDI must be 1 for the first device.  
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Revision 1.18  
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