Datasheet

LTC3219
13
3219fa
OPERATION
Sub-Address 0001 TO 1001 per Sub-Address Table Above
ULED Mode Enable Bits LED Current Data
MSB LSB
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Normal
Blink Enabled
Gradation Enabled
GPO Mode
(Gradation/Blink/Dropout Off)
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
Register Sub-Address = 1010
MSB LSB
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
ULED8 ULED7 ULED6 ULED5 ULED4 ULED3 ULED2 ULED1
Data Bytes
REG1 to REG9, Universal LED 6-bit linear DAC data with
blink/gradation.
REG10, ENU
Setting bits D0 to D7 high selects the ULED outputs to be
controlled by ENU.
REG11, Gradation and Blink Times
Setting bit D0 high selects ULED9 to be controlled by ENU,
Bits D1 to D4 control gradation and blink times.
The gradation ramp time is the time that the current ramps.
The gradation period is the total time that is required to start
and end a gradation timer.
Sub-Address = 1011
Blink Times and Period Gradation Ramp Times and Period ENU Select
D4 D3 On-Time Period D2 D1 Ramp Time Period D0
0
0
1
1
0
1
0
1
0.625s
0.156s
0.625s
0.156s
1.25s
1.25s
2.5s
2.5s
0
0
1
1
0
1
0
1
Disabled
0.24s
0.48s
0.96s
Disabled
0.325s
0.65s
1.30s
ULED9