AS1113 Ver la hoja de datos (PDF) - austriamicrosystems AG
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AS1113 Datasheet PDF : 24 Pages
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AS1113
Data Sheet - Detailed Description
Figure 12. Switching Global Error Mode Timing Diagram
OEN
LD
tTESTING
tGSW(ERROR)
tSU(ERROR)
tP(I/O)
CLK
tGSW(ERROR)
tP(I/O)
tGSW(ERROR)
tP(I/O)
SDI
TFLAG(IN)
OFLAG(IN)
SFLAG(IN)
SDO
Acquisition of
Error Status
Don’t
Care
tP4
TFLAG
tSW(ERROR)
Don’t
Care
OFLAG
Don’t
Care
SFLAG
tSW(ERROR)
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 (TFLAG, OFLAG, SFLAG) is delivered to pin SDO if any errors are
encountered.
Table 5. Global Error Mode Selections
Clock
Pulses
Output Port
0 Don't Care
1
Enabled
2
Enabled
3 Don't Care
4 Don't Care
Error-Detection Mode
Over-Temperature
Detection
Open-LED Detection
Shorted-LED Detection
Low-Current Diagnostic
Mode
Shutdown Mode
Global Error Flag/Shutdown Condition
TFLAG = SDO = 1: No over-temperature warning.
TFLAG = SDO = 0: Over-temperature warning.
OFLAG = SDO = 1: No open-LED error.
OFLAG = SDO = 0: Open-LED error.
SFLAG = SDO = 1: No shorted-LED error.
SFLAG = SDO = 0: Shorted-LED error.
SDI = 1: Wakeup
SDI = 0: Shutdown
Note: For a valid result SDI must be 1 for the first device.
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