LTC3220_15 Datasheet, PDF (12/20 Pages) Linear Technology – 360mA Universal 18-Channel LED Driver

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