ADP1660ACBZ-R7 datasheet(12/28 Pages) AD

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ADP1660

Data Sheet

Rev. 0 | Page 12 of 28

ASSIST TO FLASH MODE

The STR_POL bit in Register 0x01 can be used to change the

default polarity of the STROBE pin from active high to active low.

Additional image sensor-specific assist to flash enable modes are

included in the device. Information about these modes is avail-

able on request from the Analog Devices, Inc., sales team.

LED2 CURRENT

STROBE

I_TOR2

REG 0x0F, LED1_EN = 1

LED2_EN = 1

REG 0x01, STR_LV = 1

LED_MOD = 010

I_FL1

LED1 CURRENT

I_TOR1

I_FL2

REG 0x02, FL_TIM = XXXXms

REG 0x06, I _FL1 = XX XXXXmA

REG 0x08, I_TOR1 = X XXXXmA

REG 0x09, I_FL2 = XX XXXXmA

REG 0x0B, I_TOR2 = X XXXXmA

I2C DATA BUS

ADP1660 SETS LED1_EN TO 0.

ADP1660 SETS LED2_EN TO 0.

ADP1660 SETS LED_MOD TO 000.

Figure 20. Enabling Assist to Flash (Level-Sensitive) Mode

TORCH MODE

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

torch mode, set the LED_MOD bits to 000 (standby mode), and set

the LED1_EN and LED2_EN bits to 1 in Register 0x0F; then bring

GPIO high. Disable the LED current by bringing GPIO low or by

setting the LED1_EN and LED2_EN bits to 0. Bringing GPIO low

during torch mode automatically sets LED1_EN and LED2_EN =

0. To reenable torch mode, set LED1_EN and LED2_EN = 1 and

bring GPIO high again.

LED2 CURRENT

I2C DATA BUS

GPIO (TORCH)

I_TOR2

LED1 CURRENT

I_TOR1

REG 0x08, I_TOR1 = X XXXXmA

REG 0x0B, I_TOR2 = X XXXXmA

REG 0x0F, LED1_EN = 1

LED_MOD = 000

LED2_EN = 1

ADP1660 SETS LED1_EN TO 0.

ADP1660 SETS LED2_EN TO 0.

Figure 21. Enabling External Torch Mode Using the GPIO Pin

TORCH TO FLASH MODE

The driver can move directly from external torch mode (using

the GPIO pin) to flash mode by bringing the STROBE pin high

before GPIO is brought low. Bringing the GPIO (torch) pin low

before STROBE goes high prevents the flash from firing.

The ADP1660 returns to standby mode after a successful flash

and sets the LED1_EN and LED2_EN bits to 0 in Register 0x0F.

LED2 CURRENT

STROBE

GPIO (TORCH)

I_TOR2

REG 0x0F, LED1_EN = 1

LED2_EN = 1

REG 0x01, STR_LV = 1

LED_MOD = 000

I_FL1

LED1 CURRENT

I_TOR1

I_FL2

REG 0x02, IO_CFG = 01

FL_TIM = XXXXms

REG 0x06, I _FL1 = XX XXXXmA

REG 0x08, I_TOR1 = X XXXXmA

REG 0x09, I_FL2 = XX XXXXmA

REG 0x0B, I_TOR2 = X XXXXmA

I2C DATA BUS

ADP1660 SETS LED1_EN TO 0.

ADP1660 SETS LED2_EN TO 0.

Figure 22. Enabling Flash Mode from External Torch Mode

TxMASK OPERATION

When the ADP1660 is in flash mode, the TxMASK function can

reduce the battery load in response to the system enabling a power

amplifier. The device remains in flash mode, but the LED driver

output current is reduced to the programmed TxMASK current

level in less than 21 µs. The TxMASK current level is programmed

in Register 0x07 (for LED1) and in Register 0x0A (for LED2).

GPIO (TxMASK)

FL_TX = 1

LED2 CURRENT

STROBE

I_TX2

REG 0x0F, LED1_EN = 1

LED2_EN = 1

REG 0x01, STR_LV = 1

LED_MOD = 011

I_FL1

LED1 CURRENT

I_TX1

I_FL2

REG 0x02, IO_CFG = 10

FL_TIM = XXXXms

REG 0x06, I _FL1 = XX XXXXmA

REG 0x08, I_TOR1 = X XXXXmA

REG 0x09, I_FL2 = XX XXXXmA

REG 0x0B, I_TOR2 = X XXXXmA

I2C DATA BUS

ADP1660 SETS LED1_EN TO 0.

ADP1660 SETS LED2_EN TO 0.

ADP1660 SETS LED_MOD TO 000.

Figure 23. TxMASK Operation During Flash (Level-Sensitive) Mode

After a TxMASK event occurs, a flag is set in the fault informa-

tion register (Register 0x0C, Bit 3). When the TxMASK signal

goes low again, the LED current reverts to the full flash level in

a controlled manner to avoid overshoots on the battery current.

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