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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  
If there are multiple AS1109s 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 possi-  
ble 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 AS1109, or LED produced the error.  
Note: When no error has occurred, the detailed error report can be skipped, setting LD and subsequently OEN low.  
Error Detection Functions  
Open-LED Detection  
The AS1109 open-LED detection is based on the comparison between VDS and VTHL. The open LED status is aquired  
at the rising edge of OEN and stored internally. While detecting open-LEDs the output port must be turned on. Open  
LED detection can be started with 1 clock pulse during error detection mode while the output port is turned on.  
Note: LEDs which are turned off at test time cannot be tested.  
Table 6. Open LED Detection Modes  
Effective Output  
Point Conditions  
Detected Open-LED  
Error Status Code  
Output Port State  
Meaning  
On  
On  
VDS < VTHL  
VDS > VTHL  
0
1
Open Circuit  
Normal  
Shorted-LED  
The AS1109 shorted-LED detection is based on the comparison between VDS and VTHH. The shortened LED status is  
aquired at the rising edge of OEN and stored internally. While detecting shorted-LEDs the output port must be turned  
on. Shorted-LED detection can be started with 2 clock pulses during error detection mode while the output port is  
turned on.  
For valid results, the voltage at OUTN0:OUTN7 must be lower then VTHH under low-current diagnostic mode operating  
conditions. This can be achieved by reducing the VLED voltage or by adding additional diodes, resistors or LED’s.  
Note: LEDs which are turned off at test time cannot be tested.  
Table 7. Shorted LED Detection Modes  
Effective Output  
Point Conditions  
Detected Shorted-LED  
Error Status Code  
Output Port State  
Meaning  
On  
On  
VDS > VTHH  
VDS < VTHH  
0
1
Short Circuit  
Normal  
Overtemperature  
Thermal protection for the AS1109 is provided by continuously monitoring the device’s core temperature. The overtem-  
perature status is aquired at the rising edge of OEN and stored internally.  
Table 8. Overtemperature Modes  
Effective Output  
Point Conditions  
Detected Overtemperature  
Status Code  
Output Port State  
Meaning  
Overtemperature  
Condition  
Don’t Care  
Don’t Care  
Temperature > TOV1  
Temperature < TOV1  
0
1
Normal  
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