LM3561TMX National Semiconductor Corporation, LM3561TMX Datasheet - Page 27

• Manufacturer Part Number: LM3561TMX
• Description: Synchronous Boost Converter With 600ma High Side Led Driver And I2c-compatible Interface
• Manufacturer: National Semiconductor Corporation

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.
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.
Bit 7
VIN Monitor
Flag
0 = No Fault at
VIN (default)
1 = Input
Voltage
Monitor is
enabled and
VIN has fallen
below (V
Bit 7
Hardware
Torch Mode
Enable
0 = TX1/
TORCH is a
TX1 flash
interrupt input
(default)
1 = TX1/
TORCH pin is
a hardware
TORCH
enable. This
bit is reset to 0
after a flash
event.
IN_TH
)
Bit 6
Not Used
N/A
Bit 6
TX2 Polarity
0 = TX2 is set
for active low
polarity
1 = TX2 is set
for active high
polarity
(default)
Bit 5
LED Thermal
Fault
(NTC)
0 =LEDI/NTC
pin is above
V
1=LEDI/NTC
has fallen
below V
(NTC mode
only)
Bit 5
TX1 Polarity
0 = TX1 is set
for active low
polarity
1 = TX1 is set
for active high
polarity
(default)
TRIP
TABLE 10. Configuration Register 1 Bit Settings
(default)
TRIP
TABLE 9. Flags Register Bit Settings
Bit 4
TX2 Interrupt
0=TX2 has not
changed state
(default)
1=TX2 has
changed state
(TX2 mode
only)
Bit 4
NTC Mode
Enable
0 = LEDI/NTC
is a Indicator
Current
Source Output
(default)
1 = LEDI/NTC
is a
Comparator
Input for LED
Temperature
Sensing
27
Bit 3
TX1 Interrupt
0=TX1/
TORCH has
not changed
state (default)
1=TX1/
TORCH pin
has changed
state (TX1
mode only)
Bit 3
STROBE
Polarity
0 = STROBE
set for active
low polarity
1 = STROBE
set for active
high polarity
(default)
Bit 2
Led Fault
(LEDF)
0 = Proper
LED Operation
(default)
1 = LED Failed
(Open or
Short)
Bit 2
STROBE Input
Enable
0 = STROBE
Input Disabled
(default)
1 = STROBE
Input Enabled
Bit 1
Thermal
Shutdown
(TSD)
0 = Die
Temperature
below Thermal
Shutdown
Limit (default)
1 = Die
Temperature
has crossed
the Thermal
Shutdown
Threshold of
+150°C
Bit 1
Not Used
N/A
Bit 0
Flash Timeout
(TO)
0 = Flash
timeout did not
expire
(default)
1 = Flash
timeout
Expired
Bit 0
Not Used
N/A
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