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AS1112B-BQFT Datasheet(PDF) 10 Page - ams AG

Part # AS1112B-BQFT
Description  16-Channel LED Dr iver wi th Dot Cor rect ion and Greyscale PWM
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS1112B-BQFT Datasheet(HTML) 10 Page - ams AG

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www.austriamicrosystems.com/LED-Driver-ICs/AS1112
Revision 1.13
9 - 19
AS1112
Datasheet - D e t a i l e d D e s c r i p t i o n
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
(TJ) exceeds the threshold temperature (150°C typ), the overtemperature circuit trips and pulls XERR to ground. The overtemperature flag sta-
tus 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 precau-
tions (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 (see Table 8) and the voltage at OUTn is less than VLOD.
Note:
The voltage at each OUTn is sampled 1 s after being switched on. Please refer to Figure 10.
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 VLSD.
Note:
The voltage at each OUTn is sampled 1 s after being switched on. Please refer to Figure 10.
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.
Table 8. XERR Truth Table
Error Condition
Error Information
Selected Mode
Status
Temp.
OUTn Voltage
Thermal
Error Flag
Thermal
Warning
Flag
Open LED
Detect
Short
LED
Detect
OEN Mode XERR
O
p
e
n
TJ < TTEF
OUTn > VLOD
0
Don't Care
0
Don't Care
0
0
1
normal
OUTn < VLOD
0
Don't Care
1
Don't Care
0
0
0
open error
TJ > TTEF
OUTn > VLOD
1
Don't Care
0
Don't Care
0
0
0
temp. error
OUTn < VLOD
1
Don't Care
1
Don't Care
0
0
0
open & temp.
error
T
e
m
p
TJ > TTEF
Don't Care
0
Don't Care
Don't Care
Don't Care
1
0
1
normal
TJ < TTEF
Don't Care
1
Don't Care
Don't Care
Don't Care
1
0
0
temp error
TJ > TTWF
Don't Care
Don't Care
0
Don't Care
Don't Care
1
1
1
normal
TJ < TTWF
Don't Care
Don't Care
1
Don't Care
Don't Care
1
1
0
temp. warn


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