Datasheet

LM3561 Register Descriptions www.ti.com
Table 8. Flags Register Bit Settings
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
VIN Monitor Flag Not Used LED Thermal TX2 Interrupt TX1 Interrupt Led Fault Thermal Flash Timeout
Fault (LEDF) Shutdown (TO)
(NTC) (TSD)
0 = No Fault at N/A 0 =LEDI/NTC 0=TX2 has not 0=TX1/TORCH 0 = Proper LED 0 = Die 0 = Flash
VIN (default) pin is above changed state has not changed Operation Temperature timeout did not
1 = Input V
TRIP
(default) (default) state (default) (default) below Thermal expire (default)
Voltage Monitor 1=LEDI/NTC 1=TX2 has 1=TX1/TORCH 1 = LED Failed Shutdown Limit 1 = Flash
is enabled and has fallen below changed state pin has changed (Open or Short) (default) timeout Expired
VIN has fallen V
TRIP
(NTC mode (TX2 mode only) state (TX1 mode 1 = Die
below (V
IN_TH
) only) only) Temperature
has crossed the
Thermal
Shutdown
Threshold of
+150°C
Table 9. Configuration Register 1 Bit Settings
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Hardware Torch TX2 Polarity TX1 Polarity NTC Mode STROBE STROBE Input Not Used Not Used
Mode Enable Enable Polarity Enable
0 = TX1/TORCH 0 = TX2 is set 0 = TX1 is set 0 = LEDI/NTC is 0 = STROBE set 0 = STROBE N/A N/A
is a TX1 flash for active low for active low a Indicator for active low Input Disabled
interrupt input polarity polarity Current Source polarity (default)
(default) 1 = TX2 is set 1 = TX1 is set Output (default) 1 = STROBE set 1 = STROBE
1 = TX1/TORCH for active high for active high 1 = LEDI/NTC is for active high Input Enabled
pin is a polarity (default) polarity (default) a Comparator polarity (default)
hardware Input for LED
TORCH enable. Temperature
This bit is reset Sensing
to 0 after a flash
event.
Table 10. Configuration Register 2 Bit Settings
Bits [7:4] Bit 3 Bit 2 Bit 1 Bit 0
Not Used V
IN
Monitor Shutdown AET mode NTC Shutdown TX2 Shutdown
N/A 0 = If IN drops below V
IN_TH
0 = Normal operation for 0 = LEDI/NTC pin going below 0 = TX2 interrupt event
and the VIN Monitor feature TX1/TORCH high before V
TRIP
forces the LEDs into Torch forces the flash LED into
is enabled, the LEDs are STROBE (TX1 mode only) mode (NTC mode only) default Torch mode (TX2 mode only)
forced into Torch mode default 1 = LEDI/NTC pin going below default
(default) 1 = Alternate External Torch V
TRIP
forces the LEDs into 1 = TX2 interrupt event
1 = If IN drops below V
IN_TH
Mode. TX1/TORCH high before shutdown (NTC mode only) forces the flash LED into
and the VIN Monitor feature STROBE forces Torch mode with shutdown (TX2 mode only)
is enabled, the LEDs turn no timeout (TX1 mode only)
off
8
AN-2252 LM3561 Evaluation Kit SNOU103–MAY 2013
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