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ADP1653 データシート(PDF) 7 Page - Analog Devices |
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ADP1653 データシート(HTML) 7 Page - Analog Devices |
7 / 24 page 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. |
同様の部品番号 - ADP1653 |
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同様の説明 - ADP1653 |
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