LT3476 datasheet(13/36 Pages) AD

13 / 36 page

LT3966

Rev. 0

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Figure 3. I2C Read Transaction with PEC

Table 1. I2C Address Settings

ADR2

ADR1

Write

Address

Read

Address

Mode

GND

0xA0

0xA1

Standalone

GND

Float

0xA2

0xA3

Normal

GND

VCC

0xA6

0xA7

Normal

Float

GND

0xA8

0xA9

Normal

Float

0xAA

0xAB

Normal

Float

VCC

0xAE

0xAF

Normal

VCC

GND

0xB8

0xB9

Normal

VCC

Float

0xBA

0xBB

Normal

VCC

0xBE

0xBF

Normal

3966 F03

ACK

STOP

START

SDA

SCL

1 A3 A2

ADDRESS

A1 A0 1

D7 D6 D5 D4 D3

DATA

D2 D1 D0

PEC (CRC)

P7 P6 P5 P4 P3 P2 P1 P0

ACK

STOP

START

SDA

SCL

1 A3 A2

CHIP ADDRESS

A1 A0 0

ACK

S7 S6 S5 S4

S1 S0

S3 S2

SUB ADDRESS

OPERATION

I2C OPERATION – I2C ADDRESS SETTINGS

Normal and Standalone Mode

ADR2, ADR1 = GND, GND programs the LT3966 into a

special standalone mode that does not require I2C com-

munication. All channels are enabled, and all channel dim-

ming generators are disabled (100% on time). The device

will start up and immediately begin soft-start switching.

Analog and PWM dimming in standalone mode are con-

trolled by the channel CTRL/PWM pins. Faults are not

latched, but are indicated on the ALERT line.

All other address selections start up with channels and

dimming generators enabled, but with the PWM DIM reg-

ister set to code 0 (0% on time). The converter channels

are active, but not switching since the DIM register is set

to 0. To enable light output, write a value to the chan-

nel’s DIM register, or write a channel’s DIMEN bit to 0 to

disable dimming and provide 100% LED on time. Faults

will be indicated in a channel’s STATUS register, but not

indicated on the ALERT pin unless the mask bit is enabled

for that channel.

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