LM3561 Datasheet, PDF (24/36 Pages) Texas Instruments – LM3561 Synchronous Boost Converter with 600mA High Side LED Driver and I 2 C-Compatible Interface

Register Descriptions
Register Name
Enable Register
Indicator Brightness Register
GPIO Register
VIN Monitor Register
Torch Brightness Register
Flash Brightness Register
Flash Duration Register
Flags Register
Configuration Register 1
Configuration Register 2
TABLE 1. LM3561 Internal Registers
Internal Hex Address
0x10
0x12
0x20
0x80
0xA0
0xB0
0xC0
0xD0
0xE0
0xF0
Power On or Reset Value
0xF8
0xF8
0x80
0xF8
0xFA
0xFD
0xEF
0x00
0x6A
0xF0
ENABLE REGISTER (ADDRESS 0x10)
The Enable Register contains the enable bits that turn on the device in Indicate Mode, Torch Mode, or Flash Mode (bits[1:0]).
These bits are always reset at the end of a flash pulse. Bit [2] sets the STROBE level or edge control.
Bits[7:3]
Not Used
N/A
TABLE 2. Enable Register Bit Settings
Bit 2
Bits [1:0]
(Strobe Level or Edge, STR bit)
Enable Bits
0 = STROBE Input set for Level. Flash current Enable Bits
turns on when STROBE input is high and turns 00 = Shutdown (default)
off when STROBE either goes low or the 01 = Indicator Mode
Timeout Duration expires (default)
10 = Torch Mode
1 = STROBE Input set for edge triggered. Flash 11 = Flash Mode (bits reset at timeout)
current turns on when STROBE sees a rising
edge. Flash pulse turns off when timeout
duration expires
INDICATOR BRIGHTNESS REGISTER (ADDRESS 0x12)
The Indicator Register contains the bits to set the indicator current level in indicate mode.
Bits [7:3]
Not Used
N/A
TABLE 3. Indicator Brightness Register Bit Settings
Bits [2:0]
Indicate Current Settings
000 = 2.25mA (default)
001 = 4.5mA
010 = 6.75mA
011 = 9mA
100 = 11.25mA
101 = 13.5mA
110 = 15.75mA
111 = 18mA
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