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AS1113
Datasheet - D e t a i l e d D e s c r i p t i o n
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.
Table 6. Open LED Detection Modes
Output Port State
On
On
Effective Output
Point Conditions
V DS < V THL
V DS > V THL
Detected Open-LED
Error Status Code
0
1
Meaning
Open Circuit
Normal
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.
Table 7. Shorted LED Detection Modes
Output Port State
On
On
Effective Output
Point Conditions
V DS > V THH
V DS < V THH
Detected Shorted-LED
Error Status Code
0
1
Meaning
Short Circuit
Normal
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
Output Port State
Don’t Care
Don’t Care
Effective Output
Point Conditions
Temperature > T OV1
Temperature < T OV1
Detected Overtemperature
Status Code
0
1
Meaning
Overtemperature
Condition
Normal
www.austriamicrosystems.com/LED-Driver-ICs/AS1113
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