Datasheet

LM3561 Register Descriptions www.ti.com
Table 3. GPIO Register Bit Settings
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Not Used TX2/GPIO2/INT TX2/GPIO2 data TX2/GPIO2 data TX2/GPIO2 TX1/GPIO1 data TX1/GPIO1 data TX1/GPIO1
Interrupt Output direction Control direction Control
N/A 0 = INT mode is This bit is the 0 = TX2/GPIO2 0 = TX2/GPIO2 This bit is the 0 = TX1/GPIO1 0 = TX1/GPIO1
disabled read or write is a GPIO Input is a flash read or write is a GPIO input is configured as
(default) data for (default) interrupt input data for (default) flash interrupt
1 = When TX2/GPIO2 in 1 = TX2/GPIO2 (default) TX1/GPIO1 in 1 = TX1/GPIO1 input(default)
TX2/GPIO2 is GPIO mode is a GPIO 1 = TX2/GPIO2 GPIO mode is a GPIO output 1 = TX1/GPIO1
configured as a (default is 0) Output is configured as (default is 0) is configured as
GPIO output a GPIO a GPIO
TX2/GPIO2/INT
is set for INT
mode and will
pull low when
either the LED
Thermal Fault
Flag is set or the
VIN Monitor Flag
is set
Table 4. VIN Monitor Register Bit Settings
Bits [7:3] Bits [2:1] Bit 0
Not Used VIN Monitor Threshold Settings VIN Monitor Enable
N/A 00 = 2.9V threshold (V
IN
falling) Default 0 = VIN Monitor Comparator is disabled (default)
01=3.0V threshold (V
IN
falling) 1 = VIN Monitor Comparator is enabled.
10 = 3.1V threshold (V
IN
falling)
11 = 3.2V threshold (V
IN
falling)
Table 5. GPIO Register Bit Settings
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Not Used TX2/GPIO2/IN TX2/GPIO2 TX2/GPIO2 TX2/GPIO2 TX1/GPIO1 TX1/GPIO1 TX1/GPIO1
T Interrupt data data direction Control data data direction Control
Output
N/A 0 = INT mode This bit is the 0 = 0 = This bit is the 0 = 0 =
is disabled read or write TX2/GPIO2 is TX2/GPIO2 is read or write TX1/GPIO1 is TX1/GPIO1 is
(default) data for a GPIO Input a flash data for a GPIO input configured as
1 = When TX2/GPIO2 in (default) interrupt input TX1/GPIO1 in (default) flash interrupt
TX2/GPIO2 is GPIO mode 1 = (default) GPIO mode 1 = input(default)
configured as (default is 0) TX2/GPIO2 is 1 = (default is 0) TX1/GPIO1 is 1 =
a GPIO output a GPIO TX2/GPIO2 is a GPIO output TX1/GPIO1 is
TX2/GPIO2/IN Output configured as configured as
T is set for INT a GPIO a GPIO
mode and will
pull low when
either the LED
Thermal Fault
Flag is set or
the VIN
Monitor Flag is
set
6
AN-2252 LM3561 Evaluation Kit SNOU103–MAY 2013
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