MP3331-2A SYNCHRONOUS BOOST FLASH LED DRIVER WITH I

MP3331 Rev. 1.02

www.MonolithicPower.com

19

5/3/2016

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Table 4: Flash Timer Setting Register

Addr: 0x03

Bit

Bit Name

Access

Default

Description

7:4

FL_TIM

RW

0001

Flash timer setting bits. 50ms to 800ms, 50ms/step.

0000 = 50ms; 0001 = 100ms; …; 1111 = 800ms.

3

LED_SD

RW

0

LED_MOD and LED_EN resetting control bit.

0 = reset LED_MOD and LED_EN to default value

after flash or torch. 1 = no reset.

2

NA

RW

0

Reserved.

1:0

SW_FS

RW

00

Switching frequency setting bits. 00 = 4MHz;

01 = 3MHz; 10 = 2MHz;11 = 1MHz.

Table 5: Low Battery Voltage Setting Register

Addr: 0x04

Bit

Bit Name

Access

Default

Description

7:5

VBL_RUN

RW

111

Low battery voltage setting bits. If VIN drops below

this voltage during start-up, the current ramping

stops. If VIN drops below this voltage during the

flash current pulse, the current is decreased until

VIN is higher than its threshold. It works only in flash

mode. 000 = 3V; 001 = 3.1V; ...110 = 3.6V;

111 = disabled; 0.1V per step.

4

VBL_SD

RW

1

Device disabled or reduce the flash current selection

bit when VIN is less than the threshold set by

VBL_RUN before the flash.

1 = device disabled;

0 = Enable and the current ramps up to the current

set by I_TX.

3:0

NA

RW

NA

NA