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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
Figure 12. Switching Global Error Mode Timing Diagram
OEN
t TESTING
t GSW(ERROR)
LD
t SU(ERROR)
t GSW(ERROR)
CLK
t P(I/O)
t GSW(ERROR)
t P(I/O)
t P(I/O)
SDI
T FLAG(IN)
O FLAG(IN)
S FLAG(IN)
SDO
Don’t
Care
T FLAG
Don’t
Care
O FLAG
Don’t
Care
S FLAG
Acquisition of
t P4
t SW(ERROR)
t SW(ERROR)
Error Status
Error-Detection Mode
Acquisition of the error status occurs at the rising edge of OEN. Error-detection mode is started on the rising edge of
LD when OEN is high. The CLK signal must be low when entering error detection mode. Error detection for open- and
shorted-LEDs can only be performed for LEDs that are switched on during test time. To switch between error-detection
modes clock pulses are needed (see Table 5) .
Note: To test all LEDs, a test pattern that turns on all LEDs must be input to the AS1113.
Global Error Mode
Global error mode is entered when error-detection mode is started. Clock pulses during this period are used to select
between temperature, open-LED, and shorted-LED tests, as well as low-current diagnostic mode and shutdown mode
(see Table 5) . In global error mode, an error flag (T FLAG, O FLAG, S FLAG ) is delivered to pin SDO if any errors are
encountered.
Table 5. Global Error Mode Selections
Pulses Output Port
Clock
Error-Detection Mode
Global Error Flag/Shutdown Condition
0
1
2
3
4
Don't Care
Enabled
Enabled
Don't Care
Don't Care
Over-Temperature
Detection
Open-LED Detection
Shorted-LED Detection
Low-Current Diagnostic
Mode
Shutdown Mode
T FLAG = SDO = 1: No over-temperature warning.
T FLAG = SDO = 0: Over-temperature warning.
O FLAG = SDO = 1: No open-LED error.
O FLAG = SDO = 0: Open-LED error.
S FLAG = SDO = 1: No shorted-LED error.
S FLAG = SDO = 0: Shorted-LED error.
SDI = 1: Wakeup
SDI = 0: Shutdown
Note: For a valid result SDI must be 1 for the first device.
www.austriamicrosystems.com/LED-Driver-ICs/AS1113
Revision 1.04
11 - 24
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