ADP1650ACPZ-R7 datasheet(14/32 Pages) AD

14 / 32 page

ADP1650

Rev. C | Page 14 of 32

TORCH-TO-FLASH MODE

The driver can move directly from external torch mode (using

GPIO1) to flash mode by bringing STROBE high before GPIO1

= torch is brought low. Bringing torch low before STROBE goes

high prevents the flash from firing when STROBE goes high.

The ADP1650 returns to standby mode after a successful flash

and sets OUTPUT_EN = 0.

LED CURRENT

REG 0x02, FL_TIM = XXXX ms

IO1_CFG = 01, TORCH

REG 0x03, I_TOR = XXX mA

REG 0x03, I_FL = XXXXX mA

REG 0x04, OUTPUT_EN = 1

STR_LV = 1

LED_MOD = 00

I2C DATA BUS

I(FLASH)

STROBE

ADP1650 SETS OUTPUT_EN TO 0

I(ASSIST)

TORCH

Figure 32. Enabling Flash Mode from External Torch Mode

TxMASK OPERATION

When the ADP1650 is in flash mode, the TxMASK1 and

TxMASK2 functions 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 reduces to the pro-

grammed TxMASK light level in less than 21 μs.

LED CURRENT

REG 0x02, IO1_CFG = 10

FL_TIM = XXXX ms

REG 0x03, I_FL = XXXXX mA

REG 0x06, I_TX1 = XXXX mA

REG 0x04, OUTPUT_EN = 1

STR_LV = 1

LED_MOD = 11

I2CD ATA BUS

I(FLASH)

STROBE

ADP1650 SETS OUTPUT_EN TO 0.

ADP1650 SETS LED_MOD TO 00.

I(TXMASK1)

TXMASK1

(GPIO1)

FL_TX1 = 1

Figure 33. TxMASK1 Operation During Flash (Level-Sensitive) Mode

The device selects the TxMASK1 or TxMASK2 current level

based on whether the TxMASK1 or TxMASK2 input is used.

After a TxMASK1 or TxMASK2 occurs, a flag is set in the fault

information register. When the TxMASK signal goes low again,

the LED current goes back to the full flash level in a controlled

manner to avoid overshoots on the battery current. If both

TxMASK inputs are set high simultaneously, the TXMASK1

current level is used.

FREQUENCY FOLDBACK

Frequency foldback is an optional mode that optimizes

efficiency by reducing the switching frequency to 1.5 MHz

when VIN is slightly less than VOUT. Enable frequency

foldback by setting FREQ_FB = 1 in Register 0x04.

INDICATOR LED DRIVER

The indicator LED driver on GPIO2 provides a programmable

current source of between 2.75 mA and 11 mA for driving a red

privacy LED. The current level is programmed by the I_ILED

bits in Register 0x07. The circuit consists of a programmable

current source and a monitoring circuit that uses comparators

to determine whether the indicator LED is shorted or open. The

threshold for detection of a short is 1.2 V (maximum) and an

open circuit is 2.45 V (minimum). The indicator LED must not

be used at the same time as a flash or assist/torch event.

LOW BATTERY LED CURRENT FOLDBACK

As the battery discharges, the lower battery voltage results in

higher peak currents through the battery ESR, which may cause

early shutdown of the phone. The ADP1650 features an optional

low battery detection option, which reduces the flash current

(to a programmable level) when the battery voltage falls below a

programmable level.

REG 0x09, I_VB_LO = XXXX mA

V_VB_LO = XXX V

I2CDATA BUS

STROBE

ADP1650 SETS OUTPUT_EN TO 0.

ADP1650 SETS LED_MOD TO 00.

VIN

V(V_VB_LO)

REG 0x04, OUTPUT_EN = 1

LED_MOD = 10

FL_VB_LO = 1

50mV HYS

GLITCH < 50µs IGNORED

Figure 34. Register 0x09 Sets the Battery Voltage Threshold Level and the

Reduced LED Current Level

Table 7. VDD Level at Which the VBAT Low Function Is

Enabled

Bit Name

VDD Level

V_VB_LO

000 = disabled (default)

001 = 3.3 V

010 = 3.35 V

011 = 3.4 V

100 = 3.45 V

101 = 3.5 V

110 = 3.55 V

111 = 3.6 V

Set V_VB_LO = 000 to disable the low battery current foldback.

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