ADP1650ACBZ-R7 datasheet(13/32 Pages) AD

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ADP1650

Rev. 0 | Page 13 of 32

ASSIST LIGHT

The assist light provides continuous current 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.

LED CURRENT

REG 0x03, I_TOR = XXX

REG 0x04, OUTPUT_EN = 1

LED_MOD = 10

I2C DATA BUS

REG 0x04, OUTPUT_EN = 0

I(ASSIST)

Figure 25. Enabling Assist Light Mode

FLASH MODE

Flash mode provides 300 mA to 1.5 A for a programmable time

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

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

LED_MOD to flash mode and set OUTPUT_EN =1. Enable

flash without STROBE 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 and edge sensitive.

LED CURRENT

REG 0x04, OUTPUT_EN = 1

STR_LV = 1

LED_MOD = 11

I2C DATA BUS

I(FLASH)

STROBE

REG 0x02, FL_TIM = XXXX ms

REG 0x03, I_FL = XXXXX mA

ADP1650 SETS OUTPUT_EN TO 0.

ADP1650 SETS LED_MOD TO 00.

Figure 26. Flash Operation: Level-Sensitive Mode

In level-sensitive mode, the duration of STROBE high sets the

duration of the flash up to the maximum time set by the

FL_TIM timeout. If STROBE is kept high longer than the

duration set by FL_TIM, a timeout fault disables the flash.

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

I(FLASH)

STROBE

ADP1650 SETS OUTPUT_EN TO 0.

ADP1650 SETS LED_MOD TO 00.

FL_TIM

Figure 27. 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

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

I2C D ATA BUS

I(FLASH)

STROBE

ADP1650 SETS OUTPUT_EN TO 0.

ADP1650 SETS LED_MOD TO 00.

I(ASSIST)

Figure 28. Enabling Assist to Flash (Level-Sensitive) Mode

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

STROBE from low to high to high to low. Additional image

sensor-specific assist/flash enable modes are included in the

device, and information on these is available on request from

the Analog Devices, Inc., sales team.

TORCH MODE

Set the assist/torch light current using the I_TOR bits. To enable

torch mode using a logic signal, set LED_MOD to standby mode

and OUTPUT_EN =1, and then bring GPIO1 high. Disable

external torch mode by setting GPIO1 low or programming

OUTPUT_EN = 0. Bringing GPIO1 low during torch mode

automatically sets OUTPUT_EN = 0. To enable torch mode

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

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