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LTC3207/LTC3207-1
OPERATION
REG0, Command Byte .
Register Sub-Address = 0000
MSB
LSB
D7
CAMHL
D6
Reserved
D5
Reserved
D4
Reserved
D3
Force2x
D2
Force1p5
D1
Quick write
D0
UP
UP
Quick write
Force1p5
Force2x
0
1
0
1
1
0
1
0
Gradation counts down
Gradation counts up
Normal write to each register
Quick write, REG1 data is written to all twelve universal registers
Forces charge pump into 1.5x mode
Enables mode logic to control mode charges based on dropout signal
Forces charge pump into 2x mode.
Enables mode logic to control mode changes based on dropout signal
Force1x
Reserved
Reserved
Reserved
X
X
X
D2 (Force1p5x) = 1
D3 (Force2x) = 1
} Forces Charge Pump Into 1x Mode
CAMHL
0
1
External control of CAM
I 2 C control of CAM
Data Bytes
REG1 to REG12, Universal LED 6-bit linear DAC data with
blink/gradation.
Sub-Address 0001 TO 1100 per Sub-Address Table Above
ULED Mode Enable Bits
MSB
LED Current Data
LSB
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Normal
Blink Enabled
Gradation Enabled
GPO Mode
0
0
1
1
0
1
0
1
D5
D5
D5
D5
D4
D4
D4
D4
D3
D3
D3
D3
D2
D2
D2
D2
D1
D1
D1
D1
D0
D0
D0
D0
(Gradation/Blink/Dropout Off)
3207fc
12
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