ADP1655 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP1655

Dual LED Flash Driver with I2C-Compatible Interface

Analog Devices 

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

BALL A1

INDICATOR

1

2

3

PGND SGND

VIN

A

SW

TORCH TX_MASK

B

VOUT STROBE I2C/EN

C

LED_OUT SDA/EN2 SCL/EN1

D

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

Figure 4. Pin Configuration

ADP1655

Table 5. Pin Function Descriptions

Pin No. Mnemonic Type

A1

PGND

Ground

A2

SGND

Ground

A3

VIN

Supply

B1

SW

Output

B2

TORCH

Digital Input

B3

TX_MASK Digital Input

C1

VOUT

Output

C2

STROBE

Digital Input/

Output

C3

I2C/EN

Digital Input

D1

LED_OUT Output

D2

SDA/EN2 Digital Input/

Output

D3

SCL/EN1 Digital Input

Description

Ground for Internal Switching FET.

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

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

capacitor.

Connect a 2.2 μH inductor between SW and the battery.

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

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.

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.

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

I2C-compatible interface mode. In 2-bit logic interface mode, this acts as an output, indicating the

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

one LED.

A logic low selects the 2-bit logic interface, whereas logic high selects I2C-compatible interface. If

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

consumption < 1 μA.

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.

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

digital interface.

Second Input Bit (EN2). In I2C mode, SDA is the data input/output of the I2C-compatible interface.

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

First Input Bit (EN1). In I2C mode, SCL is the clock input of the I2C-compatible interface.

Rev. 0 | Page 7 of 24

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