ltc3220 Linear Technology Corporation, ltc3220 Datasheet - Page 13

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

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
REG19, Gradation and Blinking
Normal
Blink Enabled
Gradation Enabled
GPO Mode*
*(Gradation/Blink/Dropout Off)
Strong Pull-Down Mode
Current Limited Mode
High Impedance/Off
Unused
D4 (GB4)
MSB
D7
Up
0
0
1
1
Blink/Gradation/Dropout Enable
Unused
D3 (GB3)
D6
Blink Times and Period
0
1
0
1
0
1
Gradation counts down
Gradation counts up
Unused
D5
MSB
Bit 7
On Time
0
0
1
1
1
0
0.625s
0.156s
0.625s
0.156s
Bit 6
0
1
0
1
1
0
GB4
D4
Period
1.25s
1.25s
2.5s
2.5s
Bit 5
D5
D5
D5
D5
0
0
GB3
D3
Bit 4
D4
D4
D4
D4
0
0
D2 (GB2)
0
0
1
1
LED Current Data
Bit 3
GB2
D3
D3
D3
D3
D2
0
0
Gradation Ramp Times and Period
D1 (GB1)
Bit 2
D2
D2
D2
D2
0
0
0
1
0
1
LTC3220/LTC3220-1
GB1
D1
Bit 1
D1
D1
D1
D1
0
0
Ramp Time
Disabled
0.24s
0.48s
0.96s
LSB
D0
Up
Bit 0
LSB
D0
D0
D0
D0
0
0
Disabled
0.313s
0.625s
Period
1.25s
13
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