ADP1655

Rev. 0 | Page 7 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

PGND

SGND

VIN

SW

TORCH TX_MASK

VOUT

STROBE

I2C/EN

LED_OUT SDA/EN2 SCL/EN1

1

A

B

C

D

23

BALL A1

INDICATOR

Figure 4. Pin Configuration

Table 5. Pin Function Descriptions

Pin No.

Mnemonic

Type

Description

A1

PGND

Ground

Ground for Internal Switching FET.

A2

SGND

Ground

Connect this pin at a single point to the power ground.

A3

VIN

Supply

Connect the battery between VIN and PGND. Bypass VIN with a 10 μF, 6.3 V or greater X5R/X7R

capacitor.

B1

SW

Output

Connect a 2.2 μH inductor between SW and the battery.

B2

TORCH

Digital Input

This pin enables the torch, provided that the device is not in flash or assist light mode.

B3

TX_MASK

Digital Input

Connect a digital signal to the TX_MASK pin. When the logic level is driven high during a flash

event the current is reduced to the torch level.

C1

VOUT

Output

VOUT senses the output voltage of the boost converter and provides the input voltage to the LED

current source. The VOUT pin features a comparator to detect an overvoltage condition if the LED

string is open circuited. Connect a 10.0 μF capacitor between VOUT and PGND.

C2

STROBE

Digital Input/

Output

The STROBE input is used to synchronize the timing of the camera module to the LED driver in

number of LEDs attached. STROBE = high indicates two LEDs, whereas STROBE = low indicates

one LED.

C3

I2C/EN

Digital Input

I2C/EN is low and SDA/EN2 and SCL/EN1 are low, the driver enters shutdown mode with

consumption < 1 μA.

D1

LED_OUT

Output

White LED Anode Connection. Connect LED_OUT to the anode of the white LED. LED_OUT is

internally connected to a programmable PMOS current source, which regulates the LED current.

D2

SDA/EN2

Digital Input/

Output

Data Input/Output (SDA). In 2-bit logic interface mode, SDA/EN2 is the second input bit of the

digital interface.

D3

SCL/EN1

Digital Input

Clock Input (SCL). In 2-bit logic interface mode, SCL/EN1 is the first input bit of the digital interface.