MP3331-2A SYNCHRONOUS BOOST FLASH LED DRIVER WITH I

MP3331 Rev. 1.02

www.MonolithicPower.com

20

5/3/2016

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Table 6: Indicator Register

Addr: 0x05

Bit

Bit Name

Access

Default

Description

7

LED_OTAD

RW

0

Adaptive thermal flash current control bit.

1 = current reduced to the current set by I_TX when

Tj >130℃; 0 = disable when Tj >150℃.

6:4

TUP_I

RW

001

Current ramp-up time per step.

000 = 8µs;

001 = 16µs; …111 = 64µs/step.

3:2

VTH_PAS

RW

01

Defines the threshold when Fs drops to 1MHz or

switches to pass mode from boost mode.

00 = 300mV, 01 = 450mV, 10 = 600mV,

11 = 750mV.

1:0

INDI_PWM

RW

00

PWM duty cycle of 31.5kHz in indicator mode.

00 = 2/16; 01 = 3/16; 10 = 4/16; 11 = 5/16.

Table 7: LED Flash Current Setting Register

Addr: 0x06

Bit

Bit Name

Access

Default

Description

7:6

NA

RW

NA

Reserved.

5:0

I_FL

RW

010000

LED flash current setting bits.

0 to 2000mA, 31.7mA/step.

000000 = 0mA; 000001= 31.7mA…111111 =

2000mA. (Default 010101 = 508mA)

Table 8: TX Current Setting Register

Addr: 0x07

Bit

Bit Name

Access

Default

Description

7:6

NA

RW

NA

Reserved.

5:0

I_TX

RW

010000

Defines the flash current in flash mode if TX is

high.

0 to 2000mA, 31.7mA/step.

000000 = 0mA; 000001= 31.7mA…111111 =

2000mA. (Default 010000 = 508mA).