ltc3220 Linear Technology Corporation, ltc3220 Datasheet - Page 12

• Manufacturer Part Number: ltc3220
• Description: 360ma Universal 18-channel Led Driver
• Manufacturer: Linear Technology Corporation

OPERATION
LTC3220/LTC3220-1
Sub-Address Byte
REG0, Command Byte.
12
MSB
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
Register Sub-Address = 0000
Quick write
Force1p5
Force2x
Force1x
Shutdown
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
Unused
MSB
D7
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
0
1
1
0
1
0
1
0
Unused
D6
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
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
D2 (Force1p5x) = 1
D3 (Force2x) = 1
Shuts down part while preserving data in registers
Normal operation
LSB
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Register
Unused
REG10
REG11
REG12
REG13
REG14
REG15
REG16
REG17
REG18
REG19
REG0
REG1
REG2
REG3
REG4
REG5
REG6
REG7
REG8
REG9
D5
COMMAND
Function
ULED10
ULED11
ULED12
ULED13
ULED14
ULED15
ULED16
ULED17
ULED18
ULED1
ULED2
ULED3
ULED4
ULED5
ULED6
ULED7
ULED8
ULED9
GRAD/
Forces Charge Pump into 1x Mode
BLINK
Unused
D4
Shutdown
D3
Force2x
D2
Force1p5x
D1
Quick write
LSB
D0
32201fb