LM3559TLX National Semiconductor Corporation, LM3559TLX Datasheet - Page 28

• Manufacturer Part Number: LM3559TLX
• Description: Synchronous Boost Flash Driver With Dual 900 Ma High Side Current Sources 1.8a Total Flash Current
• Manufacturer: National Semiconductor Corporation

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FLAGS REGISTER
The Flags Register holds the flag bits indicating: Flash Time-
out, Thermal Shutdown, LED Fault (Open or Short), TX In-
terrupts (TX1 and TX2), LED Thermal Fault (NTC), VIN
CONFIGURATION REGISTER 1
Configuration Register 1 holds the STROBE Input Enable bit,
the STROBE polarity bit, the NTC Enable bit, the polarity se-
0 = V
above the VIN
Monitor
Threshold or
VIN Monitor
Threshold is
Disabled
(default)
1 = VIN
Monitor is
enabled and
V
below the
programmed
threshold
0 = TX1/
TORCH is a
TX input
(default)
1 = TX1/
TORCH pin is
a hardware
TORCH
enable. This
bit is reset to 0
after a flash
event.
(V
Torch Mode
IN
(Hardware
IN
Enable)
has fallen
Bit 7
Monitor)
Bit 7
IN
is
VIN did not fall
below the VIN
Flash Monitor
threshold
during the
flash pulse
turn-on or VIN
Flash Monitor
is disabled
(default)
1 = VIN Flash
Monitor is
enabled and
V
the
programmed
VIN Flash
Monitor
threshold
during the
flash pulse
turn-on
(TX2 Polarity)
0 = TX2 is
configured for
active low
polarity
1 =TX2 pin is
configured for
active high
polarity
(default)
IN
(VIN Flash
Monitor)
fell below
Bit 6
Bit 6
0 = LEDI/NTC
pin is above
1V(default)
1 = NTC mode
is enabled and
LEDI/NTC has
fallen below
1V
(TX1 Polarity)
0 = TX1 is
configured for
active low
polarity
1 = TX1 is
configured for
active high
polarity
(default)
(NTC Fault)
Bit 5
Bit 5
TABLE 7. Configuration Register 1 Descriptions
TABLE 6. Flags Register Descriptions
0 = TX2 has
not changed
state (default)
1 = TX2 has
changed state
(TX2 mode
only)
0 = LEDI/NTC
pin is
configured as
an indicator
output
(default)
1 = LEDI/NTC
is configured
as a
comparator
input for an
NTC
thermistor
(NTC Mode
Interrupt)
Enable)
Bit 4
(TX2
Bit 4
28
(TX1 Interrupt )
0 = TX1 has not
changed state
(default)
1 = TX1 has
changed state
(TX1 mode only)
0 = STROBE
Input Enable is
active low.
Pulling
STROBE low
will turn on
Flash current
1 = STROBE
Input is active
high. Pulling
STROBE high
will turn on
Flash current
(default)
(STROBE
Polarity)
Monitor Trip, and VIN Flash Monitor Trip. All Flags are cleared
on read back of the Flags Register. (see
lection bits for TX1 and TX2, and the Hardware Torch Enable
bit (see
Bit 3
Bit 3
Table
0 = STROBE
Pin disabled
(default)
1 = STROBE
Input enabled
Input Enable)
0 = Proper
LED
Operation
(default)
1 = LED
Failed (Open
or Short)
7).
(LED Fault)
(STROBE
Bit 2
Bit 2
0 = Die
Temperature
below
Thermal
Shutdown
Limit (default)
1 = Die
Temperature
has crossed
the Thermal
Shutdown
Threshold
N/A
Shutdown)
(Not Used)
(Thermal
Bit 1
Bit 1
Table
0 = Flash
timeout did not
expire
(default)
1 = Flash
timeout
Expired
N/A
(Not Used)
6).
timeout)
(Flash
Bit 0
Bit 0