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ADP1655 Scheda tecnica(PDF) 7 Page - Analog Devices

Il numero della parte ADP1655
Spiegazioni elettronici  Dual LED Flash Driver with I2C-Compatible Interface
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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
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.
C3
I2C/EN
Digital Input
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.
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.
Second Input Bit (EN2). In I2C mode, SDA is the data input/output of the I2C-compatible 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.
First Input Bit (EN1). In I2C mode, SCL is the clock input of the I2C-compatible interface.


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