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LM3697

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SNOSCS2D – NOVEMBER 2013 – REVISED MARCH 2019

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Copyright © 2013–2019, Texas Instruments Incorporated

(1)

The PWM inputmust always be in the inactive state when setting the Control bank PWM Enable bit. The PWM configuration bits must

only be changed when the PWM is disabled for both Control Banks.

(2)

The Control Brightness MSB Register must be written for the Control Brightness LSB Register value to take effect.

7.5 Register Maps

Table 2. LM3697 Register Descriptions

NAME

ADDRESS

POWER-ON RESET

OPERATION

Revision

0x00

0x01

Dynamic

Software Reset

0x01

0x00

Dynamic

HVLED Current Sink Output Configuration

0x10

0x06

Static

Control A Start-up/Shutdown Ramp Time

0x11

0x00

Static

Control B Start-up/Shutdown Ramp Time

0x12

0x00

Static

Control A/B Run time Ramp Time

0x13

0x00

Static

Control A/B Run time Ramp Configuration

0x14

0x00

Static

Reserved

0x15

0x33

Static

Brightness Configuration

0x16

0x00

Static

Control A Full-Scale Current Setting

0x17

0x13

Static

Control B Full-Scale Current Setting

0x18

0x13

Static

HVLED Current Sink Feedback Enables

0x19

0x07

Static

Boost Control

0x1A

0x00

Static

Auto-Frequency Threshold

0x1B

0xCF

Static

PWM Configuration

0x1C

0x0C

Dynamic(1)

Control A Brightness LSB

0x20

0x00

Dynamic(2)

Control A Brightness MSB

0x21

0x00

Dynamic

Control B Brightness LSB

0x22

0x00

Dynamic(2)

Control B Brightness MSB

0x23

0x00

Dynamic

Control Bank Enables

0x24

0x00

Dynamic

HVLED Open Faults

0xB0

0x00

Production Test Only

HVLED Short Faults

0xB2

0x00

Production Test Only

LED Fault Enables

0xB4

0x00

Production Test Only

Table 3. Revision (Address 0x00)

Bits [7:4]

Not Used

Bits [3:0]

Silicon Revision

Reserved

0001 = Rev. A2 Silicon

Table 4. Software Reset (Address 0x01)

Bits [7:1]

Not Used

Bit [0]

Silicon Revision

Reserved

0 = Normal Operation

1 = Software Reset (self-clearing)

Table 5. HVLED Current Sink Output Configuration (Address 0x10)

Bits [7:3]

Not Used

Bit [2]

HVLED3 Configuration

Bit [1]

HVLED2 Configuration

Bit [0]

HVLED1 Configuration

Reserved

0 = Control A

1 = Control B (default)

0 = Control A

1 = Control B (default)

0 = Control A (default)

1 = Control B