LTC3220/LTC3220-1
OPERATION
Data Bytes
REG1 to REG18, Universal LED 6-bit linear DAC data with
blink/gradation.
Sub-Address 00001 to 10010 per Sub-Address Table
Blink/Gradation/Dropout Enable
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
0
0
1
0
1
0
D5
D5
D5
D4
D4
D4
D3
D3
D3
D2
D2
D2
D1
D1
D1
D0
D0
D0
GPO Mode*
Strong Pull-Down Mode
Current Limited Mode
High Impedance/Off
1
1
0
1
1
0
0
D5
0
0
D4
0
0
D3
0
0
D2
0
0
D1
0
0
D0
0
*(Gradation/Blink/Dropout Off)
REG19, Gradation and Blinking
MSB
LSB
D7
Unused
D6
Unused
D5
Unused
D4
GB4
D3
GB3
D2
GB2
D1
GB1
D0
Up
Up
0
1
Gradation counts down
Gradation counts up
Blink Times and Period
Gradation Ramp Times and Period
D4 (GB4)
0
0
1
1
D3 (GB3)
0
1
0
1
On Time
0.625s
0.156s
0.625s
0.156s
Period
1.25s
1.25s
2.5s
2.5s
D2 (GB2)
0
0
1
1
D1 (GB1)
0
1
0
1
Ramp Time
Disabled
0.24s
0.48s
0.96s
Period
Disabled
0.313s
0.625s
1.25s
32201fc
13
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