MP3332

MP3332 Rev. 1.0

www.MonolithicPower.com

14

5/1/2018

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MP3332 Hardware and Level

Sensitive Flash Mode w/ Timer-Out:

ILED1

ILED2

FL_TIMER

I2C

REG 0x01,

STR_MOD=1

STR_LV=1

LED_MOD=11

REG 0x06/7,

I1_FL=XXXX

I2_FL=XXXX

REG 0x03,

FL_TIM=XXXX

REG 0x01,

LED1_EN=1

LED2_EN=1

Reset,

LED1_EN to 0

LED2_EN to 0

LED_MOD to 00

Set REG 0x0D,

FT_TO=1

STR

Figure 7: Hardware and Level Trigger Flash

Mode with Timer-Out

2. Hardware and Edge Trigger Mode

In this mode, STR_MOD = 1, STR_LV = 0,

LED1/2_EN = 1, and LED_MOD = 11 (see

Figure 8). The flash current begins ramping up

after STR goes high. The LED1 and LED2

currents

are

set

by

I_FL_1

and

I_FL_2

respectively, and the ramp-up time is set by

TUP_I. The flash current ends when the flash

timer set by FL_TIM ends. After the flash, the

LED_MOD is reset to standby mode, and

LED1/2_EN is reset to 0 if LED_SD = 0. If

LED_SD = 1, the mode, LED_MOD, and

LED1/2_EN are not reset. The LED1 and LED2

current sources are controlled by the LED1_EN

and LED2_EN bits respectively.

MP3332 Hardware and Edge

Sensitive Flash Mode:

ILED1

ILED2

STR

I2C

REG 0x01,

STR_MOD=1

STR_LV=0

LED_MOD=11

REG 0x06/7,

I1_FL=XXXX

I2_FL=XXXX

REG 0x03,

FL_TIM=XXXX

REG 0x01,

LED1_EN=1

LED2_EN=1

Reset,

LED1_EN to 0

LED2_EN to 0

LED_MOD to 00

FL_TIMER

Figure 8: Hardware and Edge Trigger Flash Mode

3. Software and Edge Trigger Mode

In this mode, STR_MOD = 0, LED1/2_EN = 1,

and LED_MOD = 11 (see Figure 9). The LED1

and LED2 currents are set by I_FL_1 and

I_FL_2 respectively, and the ramp-up time is

set by TUP_I. The flash current ends when the

flash timer set by FL_TIM ends. After the flash,

LED_MOD is reset to standby mode, and

LED1/2_EN is reset to 0 if LED_SD = 0. If

LED_SD = 1, LED_MOD and LED1/2_EN are

not reset. The LED1 and LED2 current sources

are controlled by the LED1_EN and LED2_EN

bits respectively.

MP3332 Software and Edge Sensitive

Flash Mode:

ILED1

ILED2

I2C

REG 0x01,

STR_MOD=0

LED_MOD=11

REG 0x06/7,

I1_FL=XXXX

I2_FL=XXXX

REG 0x03,

FL_TIM=XXXX

REG 0x01,

LED1_EN=1

LED2_EN=1

Reset,

LED1_EN to 0

LED2_EN to 0

LED_MOD to 00

FL_TIMER

Figure 9: Software and Edge Trigger Flash Mode

Torch Mode to Flash Mode

The MP3332 can switch to flash mode from

torch mode directly when STR goes high if

STR_MOD=1 (see Figure 10). After the flash,

the part operates in flash mode.

MP3332 Torch Mode to Flash Mode:

ILED1

ILED2

TOR

I2C

REG 0x0C/D,

I1_TOR=XXXX

I2_TOR=XXXX

REG 0x06/7,

I1_FL=XXXX

I2_FL=XXXX

REG 0x01,

LED_MOD=00

STR_MOD=1

STR_LV=1

REG 0x01,

LED1_EN=1

LED2_EN=1

REG 0x03,

FL_TIM=XXXX

Reset,

LED1_EN to 0

LED2_EN to 0

LED_MOD=00

STR

FL_TIMER

REG 0x01,

LED1_EN=1

LED2_EN=1

STR_MOD=1

STR_LV=0

REG 0x03,

FL_TIM=XXXX

Setting Time

Reset,

LED1_EN to 0

LED2_EN to 0

LED_MOD=00

Figure 10: Torch Mode to Flash Mode