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TMG39921 Datasheet(PDF) 84 Page - OSRAM GmbH |
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TMG39921 Datasheet(HTML) 84 Page - OSRAM GmbH |
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84 / 96 page  ams Datasheet Page 83 [v1-06] 2018-Feb-27 Document Feedback TMG3992 − Application Information Communications Considerations VBUS in the above figures refers to the I2C bus voltage. Separate part numbers are assigned to each of the I2C VBUS options: VBUS = VDD, or VBUS=1.8 V. The I2C signals and the Interrupt are open-drain outputs and require pull−up resistors. The pull-up resistor (RP) value is a function of the I2C bus speed, the I2C bus voltage, and the capacitive load. For example, ams EVM hardware communicates at 400 kbit/s and uses 1.5 kΩ pull-up resistors. The ams EVM hardware uses a 10 kΩ pull-up resistor (RPI) on interrupt pin. LED Drive Considerations The LED cathode is connected to the LDR pin which functions as a regulated current sink. When selecting the power supply for the LED, that is, the voltage placed on the LEDA pin, it is important to choose a supply capable of supplying a sufficient amount of current and voltage. LEDA voltage must be larger than the sum of the LED forward voltage drop and the voltage on the LDR/ LEDA current sink regulator. |
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