LTC3219 datasheet(13/20 Pages) LINER

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LTC3219

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)

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

On-Time

Period

Ramp Time

Period

0.625s

0.156s

0.625s

0.156s

1.25s

2.5s

Disabled

0.24s

0.48s

0.96s

Disabled

0.325s

0.65s

1.30s

ULED9

LTC3219 Datasheet(PDF) 13 Page - Linear Technology

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