ADP1660ACBZ-R7 datasheet(11/28 Pages) AD

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Data Sheet

ADP1660

Rev. 0 | Page 11 of 28

ASSIST LIGHT MODE

Assist light mode provides continuous LED current that is

programmable from 0 mA to 200 mA. Set the assist light

current using the I_TOR1 bits in Register 0x08 (for LED1)

and the I_TOR2 bits in Register 0x0B (for LED2).

To enable assist light mode, set the LED_MOD bits to 010

in Register 0x01, and set the LED1_EN and/or LED2_EN

bits to 1 in Register 0x0F. To disable assist light mode, set the

LED_MOD bits to 000 (standby mode), or set the LED1_EN

and LED2_EN bits to 0.

LED2 CURRENT

REG 0x08, I_TOR1 = X XXXXmA

REG 0x0B, I_TOR2 = X XXXXmA

REG 0x01, LED_MOD = 010

REG 0x0F, LED1_EN = 1

LED2_EN = 1

I2C DATA BUS

REG 0x0F, LED1_EN = 0

I_TOR2

LED1 CURRENT

I_TOR1

REG 0x0F, LED2_EN = 0

Figure 17. Enabling Assist Light Mode

FLASH MODE

Flash mode provides up to 750 mA per LED for a program-

mable time of up to 1.6 seconds. Set the flash current using

the I_FL1 bits in Register 0x06 (for LED1) and the I_FL2 bits

in Register 0x09 (for LED2). Set the maximum flash duration

using the FL_TIM bits (Bits[3:0]) in Register 0x02.

To enable flash mode, set the LED_MOD bits to 011 in

to 1 in Register 0x0F. If the LED1_EN or LED2_EN bit is set

to 0, the corresponding LED will not output current during

the flash, regardless of the flash current level setting.

To enable flash mode without using the STROBE pin, set the

STR_MOD bit to 0 in Register 0x01 (software strobe mode).

When the STR_MOD bit is set to 1 (hardware strobe mode),

setting the STROBE pin high enables flash and synchronizes

it to the image sensor. Hardware strobe mode has two timeout

modes: level sensitive and edge sensitive.

Level-Sensitive STROBE 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 bits in Register 0x02 (see Figure 18). If STROBE is kept

high longer than the duration set by the FL_TIM bits, a timeout

fault disables the flash. The timeout fault flag (Bit 4) is set in the

fault information register (Register 0x0C).

LED2 CURRENT

REG 0x0F, LED1_EN = 1

LED2_EN = 1

REG 0x01, STR_MOD = 1

STR_LV = 1

LED_MOD = 011

I2C DATA BUS

I_FL2

STROBE

REG 0x02, FL_TIM = XXXXms

REG 0x06, I_FL1 = XX XXXXmA

REG 0x09, I_FL2 = XX XXXXmA

ADP1660 SETS LED1_EN TO 0.

ADP1660 SETS LED2_EN TO 0.

ADP1660 SETS LED_MOD TO 000.

LED1 CURRENT

I_FL1

Figure 18. Flash Operation: Level-Sensitive Mode

Edge-Sensitive STROBE Mode

In edge-sensitive mode, a rising edge on the STROBE pin

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

(see Figure 19).

LED2 CURRENT

REG 0x0F, LED1_EN = 1

LED2_EN = 1

I_FL2

STROBE

REG 0x02, FL_TIM = XXXXms

REG 0x06, I_FL1 = XX XXXXmA

REG 0x09, I_FL2 = XX XXXXmA

LED1 CURRENT

I_FL1

FL_TIM

I2C DATA BUS

ADP1660 SETS LED1_EN TO 0.

ADP1660 SETS LED2_EN TO 0.

ADP1660 SETS LED_MOD TO 000.

REG 0x01, STR_MOD = 1

STR_LV = 0

LED_MOD = 011

Figure 19. Flash Operation: Edge-Sensitive Mode

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