MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I

MP3336 Rev.1.01

www.MonolithicPower.com

13

5/16/2017

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Figure 6: Hardware and Level Trigger Flash

Mode without Time-Out

Figure 7: Hardware and Level Trigger Flash

Mode with Time-Out

2. Hardware and Edge Trigger Mode

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

LED1/2_EN = 1, and LED_MOD = 11. The flash

current begins to ramp up after STR goes high.

The current is set by I1_FL and I2_FL, 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 set to 0 if

LED_SD = 0. If LED_SD = 1, the mode and

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 (see Figure 8).

Figure 8: Hardware and Edge Trigger Flash Mode

3. Software and Edge Trigger Mode

In this mode, without STR, STR_MOD = 0,

LED1/2_EN = 1, and LED_MOD = 11. The

current is set by I1_FL and I2_FL, 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 if LED1/2_EN is set to 0 with

LED_SD = 0. If LED_SD = 1, the LED_MOD is

not reset if ILED1/2_EN is set to 0. The LED1

and LED2 current sources are controlled by the

LED1_EN and LED2_EN bits respectively (see

Figure 9).