AS1109
Data Sheet - Detailed Description
Figure 18. Switching into Low-Current Diagnostic Mode Timing Diagram
2µs Low-Current
Diagnosis Mode
Global Flag Readout
Load Internal all 1s
OEN
LD
Test Pattern
(optional)
tTESTING
tSU(ERROR)
tH(L)
tGSW(ERROR)
tP4
tH(L)
CLK
tGSW(ERROR)
tGSW(ERROR)
tSW(ERROR)
SDI
Re-entering Error
Detection Mode
Don’t
Care
TFLAG OFLAG SFLAG
tP1
SDO
Normal Operation Current
For detailed timing information see Timing Diagrams on page 9.
Shutdown Mode
The AS1109 features a shutdown mode which can be entered via 4 clock pulses during error-detection mode. To
enable the shutdown mode a 0 must be placed at SDI after the rising edge of the 3rd clock pulse.
To disable shutdown mode a 1 must be placed at SDI after the 3rd clock pulse. The shutdown/wakeup information will
be latched through if multiple AS1109 devices are in a chain. At the rising edge of the 4th clock pulse the shutdown bit
will be read out and the AS1109 will shutdown or wakeup.
Note: In shutdown mode the supply current drops down to typically 3µA.
Figure 19. Shutdown Mode Timing Diagram
OEN
LD
tSU(ERROR)
CLK
1 = Wakeup
SDI
0 = Shutdown
1 = Wakeup
SDO
TFLAG
OFLAG
SFLAG
0 = Shutdown
tP4
tSU(D)
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