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ADP1653 データシート(PDF) 7 Page - Analog Devices

部品番号 ADP1653
部品情報  Compact, High Efficiency, High Power Flash/Torch LED Driver with Dual Interface
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ADP1653 データシート(HTML) 7 Page - Analog Devices

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ADP1653
Rev. A | Page 7 of 24
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
PIN 1
INDICATOR
1
SETT
2
SETF
3
CTRL1/SCL
4
CTRL0/SDA
11 INT
12 PGND
10 INTF
9HPLED
ADP1653
TOP VIEW
(Not to Scale)
Figure 4. Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
SETT
Set Torch Input (2-Bit Logic Interface Only). SETT programs the high power LED current in torch mode. An external
resistor connected between SETT and ground sets the torch current. When SETT is tied high, the current is internally
set to 125 mA. In I2C mode, this pin is regarded as a no connect.
2
SETF
Set Flash Input. SETF programs the high power LED (HPLED) current in flash mode and allows for transmit blanking
of the LED. In 2-bit logic interface mode, an external resistor connected between SETF and ground sets the flash
current. If SETF is tied high, the current is set internally to 500 mA. In I2C mode, the flash current scales with both
the external resistor and the internal HPLED bits in the output select register. If SETF is tied high, an internal 50 kΩ
resistor combined with the HPLED bits set the HPLED current.
3
CTRL1/SCL
Serial Interface Clock Input. In 2-bit logic interface mode, CTRL1 is the second input bit of the digital interface.
In I2C mode, SCL is the clock input of the I2C-compatible serial interface.
4
CTRL0/SDA
Serial Interface Data Input. In 2-bit logic interface mode, CTRL0 is the first input bit of the digital interface.
In I2C mode, SDA is the data input/output of the I2C-compatible serial interface.
5
SETI
Set Indicator Input (2-Bit Logic Interface Only). SETI programs the indicator LED current. An external resistor connected
between SETI and ground sets the indicator LED (ILED) current. If SETI is tied high, the current is internally set to
10 mA. In I2C mode, this pin is regarded as a no connect.
6
ILED
Indicator LED Input. Connect the cathode of the indicator LED to the ILED pin. Connect the anode to the battery or
to a voltage rail greater than the LED forward voltage.
7
OUT
White LED Output Voltage. OUT senses the output voltage of the white LED step-up converter. At startup, the
ADP1653 limits the rate of increase of the voltage at OUT (soft start) to prevent excessive input inrush current.
The OUT pin features a comparator to detect an overvoltage condition if the LED string is open circuited. Connect
the anode of the white LED(s) to OUT. Connect a 3.3 μF or greater capacitor between OUT and PGND.
8
GND
Analog/Digital Ground. Connect GND to PGND at the LFCSP paddle.
9
HPLED
High Power LED Current Regulator. HPLED regulates the current of the high power LED(s). Connect the cathode of
the white LED string to HPLED.
10
INTF
Interface Input. INTF selects the 2-pin interface mode. INTF is driven high to enable CTRL1 and CTRL0 for 2-bit logic
interface mode. INTF is driven low to enable SDA and SCL for I2C interfacing.
11
INT
Active Low Interrupt Output. INT is an open-drain output that transitions from high to low to signal that a fault
condition has occurred. INT should be connected via a pull-up resistor (for example, 10 kΩ to 100 kΩ) to the I/O
supply rail and directly to the system processor. When an interrupt is detected, the system processor can read the
FAULT register, using the I2C interface for details on the fault condition.
12
PGND
Power Ground for Internal Switching FET.
13
LX
White LED Switch Node. LX drives the inductor of the white LED step-up converter. An inductor and diode
connected to LX powers the white LEDs.
14
VDD
Supply Input. Connect the battery between VDD and PGND. Bypass VDD to PGND with a 4.7 μF or greater capacitor.
15
EN
Enable Input. Driving EN high turns on the ADP1653. Driving EN low disables the ADP1653 and reduces the input
current to less than 1 μA. When EN is high, disabling the LEDs puts the part into sleep mode, dropping the input
current to less than 45 μA.
16
STR
Strobe Control Input (I2C Interface Only). Driving STR high enables the flash function of the white LED. STR also
enables the watchdog timer to prevent overstressing the white LEDs.


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