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CAT4109 Datasheet(PDF) 7 Page - ON Semiconductor |
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CAT4109 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 12 page CAT4109 http://onsemi.com 7 Table 5. PIN DESCRIPTIONS Name Pin Number Function PGND 1 Power Ground. GND 2 Ground Reference. PWM3 3 PWM control input for LED3 PWM2 4 PWM control input for LED2 PWM1 5 PWM control input for LED1 RSET3 6 LED current set pin for LED3 RSET2 7 LED current set pin for LED2 RSET1 8 LED current set pin for LED1 LED3 9 LED channel 3 cathode terminal LED2 10 LED channel 2 cathode terminal LED1 11 LED channel 1 cathode terminal NC 12 Not connected inside package NC 13 Not connected inside package NC 14 Not connected inside package OE 15 Output Enable input pin VDD 16 Device Supply pin Pin Function PGND is the power ground reference pin for the device. This pin must be connected to the GND pin and to the ground plane on the PCB. GND is the ground reference pin for the entire device. This pin must be connected to the ground plane on the PCB. PWM1 to PWM3 are the control inputs respectively for LED1, LED2 and LED3 channels. When PWMx are low, the associated LED channels are turned off. When PWMx are high, the corresponding channels are turned on, assuming the OE input is also high. PWMx pins can not be left open and must be set either to logic high or low. RSET1 to RSET3 are the LED current set inputs. The current pulled out of these pins will be mirrored in the corresponding LED channel with a gain of 400. LED1 to LED3 are the LED current sink inputs. These pins are connected to the bottom cathodes of the LED strings. The current sinks bias the LEDs with a current equal to 400 times the corresponding RSETx pin current. For the LED sink to operate correctly the voltage on the LED pin must be above 0.4 V. Each LED channel can withstand voltages up to 25 V. OE is the output enable input. When high, all LED channels are enabled according to the state of their corresponding PWMx control inputs. When low, all LED channels are turned off. This pin can be used to turn all the LEDs off independently of the state of the PWMx inputs. If the OE stays low for a duration longer than tPWRDWN, the device enters shutdown mode. VDD is the positive supply pin voltage for the entire device. A small 1 mF bypass ceramic capacitor is recommended between VDD pin and ground near the device. |
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