LTC3220_15 Datasheet, PDF (13/20 Pages) Linear Technology – 360mA Universal 18-Channel LED Driver

OPERATION
Data Bytes
REG1 to REG18, Universal LED 6-bit linear DAC data with
blink/gradation.
LTC3220/LTC3220-1
Sub-Address 00001 to 10010 per Sub-Address Table
Blink/Gradation/Dropout Enable
LED Current Data
MSB
LSB
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Normal
0
Blink Enabled
0
Gradation Enabled
1
GPO Mode*
Strong Pull-Down Mode
1
Current Limited Mode
1
High Impedance/Off
0
*(Gradation/Blink/Dropout Off)
0
D5
D4
D3
D2
D1
D0
1
D5
D4
D3
D2
D1
D0
0
D5
D4
D3
D2
D1
D0
1
0
0
0
0
0
0
1
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
REG19, Gradation and Blinking
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Unused Unused Unused
GB4
GB3
GB2
GB1
Up
Up
0
Gradation counts down
1
Gradation counts up
D4 (GB4)
0
0
1
1
Blink Times and Period
D3 (GB3)
On Time
0
0.625s
1
0.156s
0
0.625s
1
0.156s
Period
1.25s
1.25s
2.5s
2.5s
Gradation Ramp Times and Period
D2 (GB2)
D1 (GB1) Ramp Time
Period
0
0
Disabled
Disabled
0
1
0.24s
0.313s
1
0
0.48s
0.625s
1
1
0.96s
1.25s
32201fc
13