LM3561 Datasheet, PDF (28/36 Pages) Texas Instruments – LM3561 Synchronous Boost Converter with 600mA High Side LED Driver and I 2 C-Compatible Interface

FLAGS REGISTER (ADDRESS 0XD0)
The Flags Register holds the status of the flag bits indicating LED Failure, Over-Temperature, the Flash Timeout expiring, VIN
Monitor Fault, LED over temperature (NTC), and a TX1 or TX2 interrupt.
Bit 7
VIN Monitor
Flag
Bit 6
Not Used
0 = No Fault at N/A
VIN (default)
1 = Input
Voltage
Monitor is
enabled and
VIN has fallen
below (V_{IN_TH})
TABLE 9. Flags Register Bit Settings
Bit 5
LED Thermal
Fault
(NTC)
Bit 4
TX2 Interrupt
Bit 3
TX1 Interrupt
Bit 2
Led Fault
(LEDF)
Bit 1
Thermal
Shutdown
(TSD)
Bit 0
Flash Timeout
(TO)
0 =LEDI/NTC 0=TX2 has not 0=TX1/
0 = Proper 0 = Die
0 = Flash
pin is above changed state TORCH has LED Operation Temperature timeout did not
V_TRIP (default) (default)
1=LEDI/NTC 1=TX2 has
not changed (default)
below Thermal expire
state (default) 1 = LED Failed Shutdown
(default)
has fallen
changed state 1=TX1/
(Open or
Limit (default) 1 = Flash
below V_TRIP
(NTC mode
(TX2 mode
only)
TORCH pin Short)
has changed
1 = Die
timeout
Temperature Expired
only)
state (TX1
has crossed
mode only)
the Thermal
Shutdown
Threshold of
+150°C
CONFIGURATION REGISTER 1 (ADDRESS 0XE0)
Configuration Register 1 contains the STROBE enable/disable bit, the STROBE polarity bit, the NTC enable bit, the polarity se-
lection for TX1 and TX2 flash interrupts, and the hardware torch mode enable for TX1/TORCH.
TABLE 10. Configuration Register 1 Bit Settings
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Hardware
TX2 Polarity TX1 Polarity NTC Mode
Torch Mode
Enable
STROBE
Polarity
Enable
0 = TX1/
0 = TX2 is set 0 = TX1 is set 0 = LEDI/NTC 0 = STROBE
TORCH is a for active low for active low is a Indicator set for active
TX1 flash
polarity
polarity
Current
low polarity
interrupt input 1 = TX2 is set 1 = TX1 is set Source Output 1 = STROBE
(default)
for active high for active high (default)
set for active
1 = TX1/
polarity
TORCH pin is (default)
polarity
(default)
1 = LEDI/NTC high polarity
is a
(default)
a hardware
Comparator
TORCH
Input for LED
enable. This
Temperature
bit is reset to 0
Sensing
after a flash
event.
Bit 2
Bit 1
STROBE Input Not Used
Enable
0 = STROBE N/A
Input Disabled
(default)
1 = STROBE
Input Enabled
Bit 0
Not Used
N/A
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