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SP7682 Datasheet(PDF) 4 Page - Exar Corporation |
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SP7682 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 19 page Sept 27-07 rev G SP7682: Backlight and Flash Driver © 2007 Exar Corporation Page 4 PIN DESCRIPTION PIN # PIN NAME DESCRIPTION 1 VIN Power supply input. Place a 4.7uF decoupling capacitor next to this pin. 2 PGND Power ground pin. 3 EN Enable/Shutdown (Logic high = enable, logic low = shutdown). Used to immediately disable the driver and reset the output current level. 4, 5 SCL,SDA (SP7682) These pins connect to the I 2C bus. Multiple functions can be programmed through his interface. 4 SETFL (SP7682A) Used to serially program the Flash LED current 5 SETBL (SP7682A) Used to serially program the Backlight LED’s output current 6 FLASH High current internal current source. Connect a high brightness LED between this pin and VOUT. The value of the current can be programmed via the I 2C interface between 0mA and 500mA with 10mA increments. During operation this pin is monitored for dropout. When dropout condition detected the charge pump increases operation mode from 1x to 1.5x to 2x. If the FLASH current is set to above the maximum threshold the time-out protection circuit is activated. After the maximum time of constant operation, FLASH current is reduced to zero. 7,8,9, 10 LED1- LED4 Internal current source for LCD backlight. Connect an LED between each of these pins and VOUT. The value of the current can be programmed via the I 2C interface between 0mA and 32mA with 0.5mA increments. During operation this pin is monitored for dropout. When dropout condition detected the charge pump increases operation mode from 1x to 1.5x to 2x. If any of the LEDs are not used connect the corresponding pin to Vout. 11 SGND Signal ground pin. 12 VOUT Output voltage of the internal charge pump. Connect the LEDs between this pin and the corresponding internal current source. Connect a 2.2uF capacitor between VOUT and PGND. 13,14, 15,16 C2+, C2-, C1+, C1- Connect external flying capacitors between these pins. - Thermal Pad Connect thermal pad to PGND pin. |
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