LTC3220/LTC3220-1
OPERATION
Sub-Address Byte
MSB
LSB
7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Register
REG0
REG1
REG2
REG3
REG4
REG5
REG6
REG7
REG8
REG9
REG10
REG11
REG12
REG13
REG14
REG15
REG16
REG17
REG18
REG19
Function
COMMAND
ULED1
ULED2
ULED3
ULED4
ULED5
ULED6
ULED7
ULED8
ULED9
ULED10
ULED11
ULED12
ULED13
ULED14
ULED15
ULED16
ULED17
ULED18
GRAD/
BLINK
REG0, Command Byte .
Register Sub-Address = 0000
MSB
LSB
D7
Unused
D6
Unused
D5
Unused
D4
Unused
D3
Shutdown
D2
Force2x
D1
Force1p5x
D0
Quick write
Quick write
Force1p5
Force2x
0
1
1
0
1
0
Serial write to each register
Parallel write, REG1 data is written to all eighteen universal registers
Forces charge pump into 1.5x mode
Enables mode logic to control mode changes based on dropout signal
Forces charge pump into 2x mode
Enables mode logic to control mode changes based on dropout signal
Force1x
D2 (Force1p5x) = 1
D3 (Force2x) = 1
Forces Charge Pump into 1x Mode
Shutdown
1
0
Shuts down part while preserving data in registers
Normal operation
32201fc
12
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