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LTC3209EUF-1 Datasheet(PDF) 11 Page - Linear Technology |
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LTC3209EUF-1 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  LTC3209-1/LTC3209-2 11 320912fa Serial Port The microcontroller compatible I2C serial port provides all of the command and control inputs for the LTC3209-1/ LTC3209-2. Data on the SDA input is loaded on the rising edge of SCL. D7 is loaded first and D0 last. There are three data registers and one address register. Once all address bits have been clocked into the address register acknowl- edge occurs. After the data registers have been written a load pulse is created after the stop bit. The load pulse transfers all of the data held in the data registers to the DAC registers. At this point the LED current will be changed to the new settings. The serial port uses static logic registers so there is no minimum speed at which it can be operated. MAIN Current Sources LTC3209-1 There are six MAIN current sources. These current sources have an 8-bit linear DAC for current control. For RREF = 24.3k, the output current range is 0mA to 28mA in 256 steps. The current sources are disabled when a block receives an all zero data word. The supply current for that block is reduced to zero. In addition unused LED outputs can be connected to CPO to turn off the current source output and reduce the operating current to typically 10 µA. LTC3209-2 There are five MAIN current sources. These current sources have an 8-bit linear DAC for current control. For RREF = 24.3k, the output current range is 0mA to 28mA in 256 steps. The current sources are disabled when a block receives an all zero data word. The supply current for that block is reduced to zero. In addition unused LED outputs can be connected to CPO to turn off the current source output and reduce the operating current to typically 10 µA. OPERATIO Camera Current Sources LTC3209-1 There is one CAM current source. This current source has a 4-bit linear DAC for current control. The output current range is 0mA to 400mA in 16 steps (RREF = 24.3k). The current source is disabled when the block receives an all zero data word. The supply current for the block is reduced to zero. In addition, the LED output can be connected to CPO to turn off the current source output and reduce operating current to typically 10 µA.Thispincannot be allowed to float if unused since dropout will be errone- ously detected. LTC3209-2 There are two CAM current sources. These current sources have a 4-bit linear DAC for current control. The output current range of each current source is 0mA to 200mA in 16 steps (RREF = 24.3k). The current sources are disabled when the block receives an all zero data word. The supply current for the block is reduced to zero. In addition unused LED outputs can be connected to CPO to turn off the current source output and reduce the operating current to typically 10 µA. These pins cannot be allowed to float if unused since dropout will be erroneously detected. Auxiliary Current Source There is one AUX current source. This current source has a 2-bit Linear DAC for current control. The output current range is 0mA to 13.75mA in 4 steps (OFF, 33%, 67%, 100%). The AUX output does not have dropout detection and cannot be disabled when connected to CPO. The current source is disabled when the block receives an all zero data word and the supply current for the block is reduced to zero. This output can also be used as an I2C controlled digital open-drain general purpose output. |
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