ADP1649ACBZ-R7 datasheet(12/28 Pages) AD

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ADP1649

Data Sheet

Rev. 0 | Page 12 of 28

ASSIST LIGHT

The assist light mode provides a continuous current that is

programmable from 25 mA to 200 mA. Set the assist light

current using the I_TOR bits (in Register 0x03).

To enable assist, set LED_MOD to assist light mode and set

OUTPUT_EN = 1 (in Register 0x04). Disable assist light mode by

setting LED_MOD to standby mode or setting OUTPUT_EN = 0.

Figure 24. Enabling and Disabling Assist Light Mode

FLASH MODE

Flash mode provides 300 mA to 1 A for a programmable time of

up to 1.6 seconds. Set the flash current using the I_FL bits (in

bits (in Register 0x02). To enable flash mode, set LED_MOD

to flash mode and set OUTPUT_EN = 1. Enable flash without

the STROBE pin by setting STR_MODE (in Register 0x04) to 0

(software strobe).

When STR_MODE is in hardware strobe mode, setting the

STROBE pin high enables flash and synchronizes it to the image

sensor. Hardware strobe mode has two modes for timeout: level

sensitive (STR_LV = 1, Register 0x04) and edge sensitive

(STR_LV = 0, Register 0x04).

Figure 25. Flash Operation: Level Sensitive Mode

In level sensitive mode, the duration of the STROBE pin set to

high sets the duration of the flash up to the maximum time

indicated by the FL_TIM timeout. If STROBE remains high

longer than the duration set by FL_TIM, a timeout fault

disables the flash.

Figure 26. Flash Operation: Edge Sensitive Mode

In edge sensitive mode, a positive edge on the STROBE pin

enables the flash, and the FL_TIM bits set the flash duration.

ASSIST TO FLASH OPERATION

Figure 27. Enabling Assist to Flash (Level Sensitive) Mode

The STR_POL bit in Register 0x07 changes the default enable of

the STROBE pin from low to high and from high to low. Additional

image sensor specific assist/flash enable modes are included in

the device, and information on these modes is available by request

from the Analog Devices, Inc., sales team.

TORCH MODE

Set the assist/torch light current modes using the I_TOR bits.

To enable torch mode using a logic signal, set LED_MOD to

standby mode, set OUTPUT_EN = 1, and bring GPIO1 high.

Disable the external torch mode by setting GPIO1 low or pro-

gramming OUTPUT_EN = 0. Bringing GPIO1 low during torch

mode automatically sets OUTPUT_EN = 0. To reenable torch

mode, program OUTPUT_EN = 1 and bring GPIO high again.

Figure 28. Enabling External Torch Mode Using GPIO1

LED CURRENT

REG 0x03, I_TOR = XXX mA

REG 0x04, OUTPUT_EN = 1

LED_MOD = 10

I2C DATA BUS

REG 0x04, OUTPUT_EN = 0

IASSIST

LED CURRENT

REG 0x04, OUTPUT_EN = 1

STR_LV = 1

LED_MOD = 11

I2C DATA BUS

IFLASH

STROBE

REG 0x02, FL_TIM = XXXX ms

REG 0x03, I_FL = XXXXX mA

ADP1649 SETS OUTPUT_EN TO 0.

ADP1649 SETS LED_MOD TO 00.

I2C DATA BUS

LED CURRENT

REG 0x02, FL_TIM = XXXX ms

REG 0x03, I_FL = XXXXX mA

REG 0x04, OUTPUT_EN = 1

STR_LV = 0

LED_MOD = 11

IFLASH

STROBE

ADP1649 SETS OUTPUT_EN TO 0.

ADP1649 SETS LED_MOD TO 00.

FL_TIM

LED CURRENT

REG 0x02, FL_TIM = XXXX ms

REG 0x03, I_TOR = XXX mA

REG 0x03, I_FL = XXXXX mA

REG 0x04, OUTPUT_EN = 1

STR_LV = 1

LED_MOD = 10

I2CD ATA BUS

IFLASH

STROBE

ADP1649 SETS OUTPUT_EN TO 0.

ADP1649 SETS LED_MOD TO 00.

IASSIST

LED CURRENT

REG 0x03, I_TOR = XXX mA

REG 0x04, OUTPUT_EN = 1

LED_MOD = 00

I2C DATA BUS

IASSIST

ADP1649 SETS OUTPUT_EN TO 0

GPIO1 (TORCH)

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