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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AS1112 Datenblatt(PDF) 10 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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AS1112 Datenblatt(HTML) 10 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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10 / 20 page  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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