AS1112-BQFT austriamicrosystems, AS1112-BQFT Datasheet - Page 9

• Manufacturer Part Number: AS1112-BQFT
• Description: IC DRIVER LED 16-CHAN 32-TQFN
• Manufacturer: austriamicrosystems
• Type: Constant Currentr

Specifications of AS1112-BQFT

• Constant Current: Yes
• Topology: PWM
• Number Of Outputs: 16
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: Color
• Frequency: 30MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 15V
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 69mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -

AS1112
Datasheet - D e t a i l e d D e s c r i p t i o n
Table 8. 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
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
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.
www.austriamicrosystems.com/LED-Driver-ICs/AS1112
J
O
m
T
p
e
n
e
p
) exceeds the threshold temperature (150°C typ), the overtemperature circuit trips and pulls XERR to ground. The overtemperature flag sta-
T
T
T
T
T
T
J
J
Temp.
J
J
J
J
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
Error Flag
Thermal
Don't Care
Don't Care
0
0
1
1
0
1
Warning
Thermal
Don't Care
Don't Care
Don't Care
Don't Care
Don't Care
Don't Care
(see Table 8)
Error Information
Flag
0
1
Revision 1.09
Open LED
and the voltage at OUTn is less than V
LSD
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
Don't Care
Don't Care
Don't Care
Don't Care
Detect
Short
LED
Figure
Figure
8.
8.
OEN Mode XERR
0
0
0
0
1
1
1
1
Selected Mode
LOD
1
0
0
0
0
0
0
1
.
1
0
0
0
1
0
1
0
open & temp.
temp. error
temp. warn
open error
temp error
Status
normal
normal
normal
error
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