Datenblatt-Suchmaschine für elektronische Bauteile |
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MAX16805 Datenblatt(PDF) 11 Page - Maxim Integrated Products |
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MAX16805 Datenblatt(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback ______________________________________________________________________________________ 11 The dimming feature can be used for LED brightness adjustment (see the Typical Operating Circuits) and theater dimming. If the external PWM signal is used, theater dimming can be achieved by varying the PWM duty cycle. Figure 2 shows a simple circuit that imple- ments theater dimming with a DC input signal. Thermal Sensor Inputs/I2C Interface (TFP/SCL and TFN/SDA) The MAX16806 features dual-function inputs, TFP/SCL and TFN/SDA. In programming mode, TFP/SCL and TFN/SDA serve as the I2C serial communication inter- face. TFP/SCL and TFN/SDA also serve as inputs for analog signals generated by an external temperature sensor such as the MAX6613. The MAX16805 does not offer dual-function inputs. SCL and SDA are used only to communicate with the MAX16805 through the I2C interface. Momentary Switch Interface (SW) The MAX16806 offers a momentary switch (SW) that overrides the analog dimming signal by latching the output current to 100% duty cycle. The MAX16806 does not override external PWM signal at DIM or dim- ming caused by thermal or LED current foldback. To latch the output current into a 100% duty cycle, press SW once. To restore the initial duty cycle determined by the DC level at DIM, press SW again. The MAX16806 provides a minimum of 1mA of wetting cur- rent to the momentary switch. Overtemperature Protection The MAX16805/MAX16806 enter a thermal shutdown in the event of overheating. This typically occurs in over- load or output short-circuit conditions. When the junc- tion temperature exceeds TJ = +155°C (typ), the internal thermal protection circuitry turns off the pass device. The MAX16805/MAX16806 recover from ther- mal shutdown once the junction temperature drops by +23°C (typ). This feature allows self-protection by ther- mally cycling in the event of a short-circuit or overload condition. Digital Interface The MAX16805/MAX16806 feature an I2C, 2-wire serial interface consisting of a bidirectional serial data line (SDA) and a serial clock line (SCL). SDA and SCL facili- tate bidirectional communication between the MAX16805/MAX16806 and the master device at rates up to 400kHz. The master (typically a microcontroller) initiates data transfer on the bus and generates SCL. Start and Stop Conditions Both SCL and SDA remain high when the interface is not busy. A master controller signals the beginning of a transmission with a START condition by transitioning SDA from high to low while SCL is high. The master controller issues a STOP condition by transitioning the SDA from low to high while SCL is high, when it finishes communicating with the slave. The bus is then free for another transmission (Figure 3). MAX16805 MAX16806 IN OUT V5 LEDs RSENSE VIN THEATER DIMMING SIGNAL +5V REG CS+ 0.1 µF CS- DIM GND EN Figure 2. Theater Dimming Light START CONDITION S P SDA SCL STOP CONDITION Figure 3. I2C Communication Start and Stop Conditions |
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Ähnliche Beschreibung - MAX16805 |
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