as1112b-bqft austriamicrosystems, as1112b-bqft Datasheet - Page 9

• Manufacturer Part Number: as1112b-bqft
• Description: 16-channel Led Driver With Dot Correction And Greyscale Pwm
• Manufacturer: austriamicrosystems

AS1112
Data Sheet - D e t a i l e d D e s c r i p t i o n
Table 9. XERR Truth Table
Overtemperature Error/Warning Flags
The AS1112 provides a overtemperature circuit to indicate that the device is in an overtemperature condition. If the
device junction temperature (T
pulls XERR to ground. The overtemperature flag status can be read out from the AS1112 status register.
To prevent an overtemperature condition the AS1112 offers an temperature warning flag at 125°C typical. This flag can
be used to take precautions (e.g. start an external cooling) against a overtemperature condition.
Open LED Detection
The AS1112 integrated open LED detection circuit reports an error if any of the 16 LEDs is open or disconnected from
the circuit. The open LED detection circuit trips when the error detection is activated
OUTn is less than V
Note: The voltage at each OUTn is sampled 1µs after being switched on. Please refer to
The open LED detection circuit also pulls XERR to GND when tripped. The open LED status of each channel can also
be read out from the AS1112 status information data (SID) during a greyscale data input cycle.
Shorted LED Detection
The AS1112 integrated shorted LED detection circuit detects if any of the 16 LEDs is short-circuited. The shorted LED
detection circuit trips when the error detection is activated and the voltage at OUTn is higher than V
Note: The voltage at each OUTn is sampled 1µs after being switched on. Please refer to
The shorted LED status of each channel can only be read out from the AS1112 status information data (SID) during a
greyscale data input cycle.
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O
m
T
p
e
n
e
p
T
T
T
T
T
T
J
J
J
J
J
J
Temp.
Error Condition
> T
< T
< T
> T
> T
< T
TWF
TWF
TEF
TEF
TEF
TEF
OUTn Voltage
OUTn > V
OUTn < V
OUTn > V
OUTn < V
Don't Care
Don't Care
Don't Care
Don't Care
LOD
.
LOD
LOD
LOD
LOD
J
) exceeds the threshold temperature (150°C typ), the overtemperature circuit trips and
Error Flag
Don't Care
Don't Care
Thermal
0
0
1
1
0
1
Don't Care
Don't Care
Don't Care
Don't Care
Don't Care Don't Care Don't Care
Don't Care Don't Care Don't Care
Warning
Thermal
Error Information
Flag
0
1
Revision 1.02
Open LED
Don't Care Don't Care
Don't Care Don't Care
Detect
0
1
0
1
Don't Care
Don't Care
Don't Care
Don't Care
Detect
Short
LED
OEN Mode XERR
(see Table 9)
0
0
0
1
1
1
0
1
Selected Mode
Figure
Figure
0
0
0
0
0
0
1
1
8.
8.
and the voltage at
LSD
1
0
0
0
1
0
1
0
.
temp. warn
temp. error
temp. error
open error
temp error
open &
normal
normal
normal
Status
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