LM3556_15 Datasheet, PDF (26/39 Pages) Texas Instruments – Synchronous Boost LED Flash Driver With High-Side Current Source

LM3556
SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015
7.6.1.12 Flags Register (0x0B)
Table 14. Flags Register Description
Bit 7
TX Event
0 = Default
Bit 6
NTC Trip
0 = Default
Bit 5
IVFM
0 = Default
TX Event Flag TX event occurred.
Bit 4
UVLO
0 = Default
Bit 3
OVP
0 = Default
Bit 2
LED or VOUT
Short Fault
0 = Default
Bit 1
Thermal
Shutdown
0 = Default
NTC Trip Flag NTC threshold crossed.
IVFM Flag IVFM block reported and/or adjusted LED current.
UVLO Fault UVLO threshold crossed.
OVP Flag Overvoltage Protection tripped. Open output capacitor or open LED.
LED Short Fault LED short detected.
Thermal Shutdown Fault LM3556 die temperature reached thermal shutdown value.
Time-Out Flag Flash Timer tripped.
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Bit 0
Flash Time-out
0 = Default
NOTE
Faults require a read-back of the Flags Register to resume operation. Flags report an
event occurred, but do not inhibit future functionality. A read-back of the Flags Register
updates again if the fault or flags are still present upon a restart.
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