ADP1655 Analog Devices, ADP1655 Datasheet - Page 7

• Manufacturer Part Number: ADP1655
• Description: Dual LED Flash Driver with I2C Compatible Interface
• Manufacturer: Analog Devices

Specifications of ADP1655

• Product Description: Serial 2 WLED Flash Driver
• Led #: 2
• Led Configuration: Serial
• Topology: Inductive
• Application: Flash
• I2c Support: Yes
• Max Iout (ma): 400mA
• Brightness Control: I2C
• Peak Efficiency (%): n/a
• Switching Frequency: 2MHz
• Over Volt Protection (v): 10V
• Vin Min (v): 2.5V
• Vout (v): Current Output
• Synchronous: Yes
• Package: 12-Bump WLCSP

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 5. Pin Function Descriptions
Pin No.
A1
A2
A3
B1
B2
B3
C1
C2
C3
D1
D2
D3
Mnemonic
PGND
SGND
VIN
SW
TORCH
TX_MASK
VOUT
STROBE
I2C/EN
LED_OUT
SDA/EN2
SCL/EN1
Type
Ground
Ground
Supply
Output
Digital Input
Digital Input
Output
Digital Input/
Output
Digital Input
Output
Digital Input/
Output
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
I
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 I
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 I
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 I
2
C-compatible interface mode. In 2-bit logic interface mode, this acts as an output, indicating the
A
B
C
D
LED_OUT SDA/EN2 SCL/EN1
BALL A1
INDICATOR
Figure 4. Pin Configuration
PGND
VOUT
SW
1
Rev. 0 | Page 7 of 24
(BALL SIDE DOWN)
2
C mode, SCL is the clock input of the I
Not to Scale
STROBE
TOP VIEW
TORCH TX_MASK
SGND
2
C mode, SDA is the data input/output of the I
2
I2C/EN
VIN
3
2
C-compatible interface.
2
C-compatible interface. If
2
C-compatible interface.
ADP1655