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参数资料
型号： AS1113-BSST
厂商： AUSTRIAMICROSYSTEMS AG
元件分类： LED驱动器
英文描述： 50mA, 16-CH, Diagnostics
中文描述： 50mA的，16通道LED驱动器与诊断
文件页数： 12/24页
文件大小： 1002K
代理商： AS1113-BSST
12 - 24
AS1113
Datasheet - Detailed Description
If there are multiple AS1113s 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
*t
P(I/O)
+ t
SW(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 AS1113, 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 AS1113 open-LED detection is based on the comparison between V
DS
and V
THL
. 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 and will be shown as a logic 1 in the detailed error
report.
Shorted-LED
The AS1113 shorted-LED detection is based on the comparison between V
DS
and V
THH
. 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:OUTN15 must be lower then V
THH
under low-current diagnostic mode operat-
ing conditions. This can be achieved by reducing the V
LED
voltage or by adding additional diodes, resistors or LED’s.
Note:
LEDs which are turned off at test time cannot be tested and will be shown as a logic 1 in the detailed error
report.
Overtemperature
Thermal protection for the AS1113 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
Table 6. Open LED Detection Modes
Output Port State
Effective Output
Point Conditions
V
DS
< V
THL
V
DS
> V
THL
Detected Open-LED
Error Status Code
0
1
Meaning
On
On
Open Circuit
Normal
Table 7. Shorted LED Detection Modes
Output Port State
Effective Output
Point Conditions
V
DS
> V
THH
V
DS
< V
THH
Detected Shorted-LED
Error Status Code
0
1
Meaning
On
On
Short Circuit
Normal
Output Port State
Detected Overtemperature
Status Code
Meaning
Don’t Care
Temperature > T
OV1
0
Overtemperature
Condition
Normal
Don’t Care
Temperature < T
OV1
1
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