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LTC3210EUD-1 Datasheet(PDF) 7 Page - Linear Integrated Systems |
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LTC3210EUD-1 Datasheet(HTML) 7 Page - Linear Integrated Systems |
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7 / 16 page  LTC3210 3210fb C1P, C2P, C1M, C2M (Pins 1, 16, 14, 13): Charge Pump Flying Capacitor Pins. A 2.2µF X7R or X5R ceramic ca- pacitor should be connected from C1P to C1M and C2P to C2M. CPO (Pin 2): Output of the Charge Pump Used to Power All LEDs. This pin is enabled or disabled using the ENM and ENC inputs. A 2.2µF X5R or X7R ceramic capacitor should be connected to ground. ENM, ENC (Pins 3, 10): Inputs. The ENM and ENC pins are used to program the LED output currents. Each input is strobed up to 7 times to decrement the internal 3-bit DACs from full-scale to 1LSB. The counter will stop at 1 LSB if the strobing continues. The pin must be held high after the final desired positive strobe edge. The data is transferred after a 150µs (typ) delay. Holding the ENM or ENC pin low will set the LED current to 0 and will reset the counter after 150µs (typ). If both inputs are held low for longer than 150µs (typ) the part will go into shutdown. The charge pump mode is reset to 1x whenever ENC goes low or when the part is in shutdown mode. MLED1, MLED2, MLED3, MLED4 (Pins 4, 5, 6, 7): Outputs. MLED1 to MLED4 are the MAIN current source outputs. The LEDs are connected between CPO (anodes) and MLED1-4 (cathodes). The current to each LED output is set via the ENM input, and the programming resistor connected between RM and GND. Each of the four LED outputs can be disabled by connecting the output directly to CPO. A 10µA current will flow through each directly connected LED output. RM, RC (Pins 8, 9): LED Current Programming Resistor Pins. The RM and RC pins will servo to 1.2V. Resistors connected between each of these pins and GND are used to set the CLED and MLED current levels. Connecting a resistor 12k or less will cause the LTC3210 to enter overcurrent shutdown. CLED (Pin 11): Output. CLED is the CAM current source output. The LED is connected between CPO (anode) and CLED (cathode). The current to the LED output is set via the ENC input, and the programming resistor connected between RC and GND. GND (Pin 12): Ground. This pin should be connected to a low impedance ground plane. VBAT(Pin15):Supplyvoltage.Thispinshouldbebypassed with a 2.2µF, or greater low ESR ceramic capacitor. Exposed Pad (Pin 17): This pad should be connected directly to a low impedance ground plane for optimal thermal and electrical performance. pin Functions |
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