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ADP8863ACPZ-R7 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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ADP8863ACPZ-R7 bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 48 page Charge Pump, 7-Channel Fun Lighting LED Driver ADP8863 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved. FEATURES Automated blinking and funlight timing for each LED driver 16 programmable fade in and fade out times 0.1 sec to 5.5 sec Selectable linear, square, or cubic fade rates 7 independent and programmable LED drivers 7 drivers capable of 30 mA (maximum) 1 driver also capable of 60 mA (maximum) Programmable maximum current limit (128 levels) Separate and independent controls for backlight LEDs Backlight fade override Up to two built-in comparator inputs with programmable modes for ambient light sensing Charge pump with automatic gain selection of 1×, 1.5×, and 2× for maximum efficiency Standby mode for <1 μA current consumption I2C-compatible interface for all programming Dedicated reset pin and built-in power-on reset (POR) Short-circuit, overvoltage, and overtemperature protection Internal soft start to limit inrush currents Input-to-output isolation during faults or shutdown Operation down to VIN = 2.5 V with undervoltage lockout (UVLO) at VIN = 2.0 V Small lead frame chip scale package (LFCSP) APPLICATIONS LED indication Funlight indicator lighting Keypad backlighting RGB LED color generation and mixing General backlighting of small format displays TYPICAL OPERATING CIRCUIT D1 D2 D3 D4 D5 D6 D7 VDDIO nRST SDA SCL VIN CIN 1µF GND1 GND2 C2+ C2– C2 1µF C1+ C1– C1 1µF COUT 1µF 0.1µF ADP8863 nINT CMP_IN VALS VOUT PHOTO SENSOR Figure 1. GENERAL DESCRIPTION The ADP8863 combines a powerful charge pump driver with advanced autonomous LED lighting features. It allows as many as seven LEDs to be independently driven up to 30 mA (maximum). The seventh LED can also be driven to 60 mA (maximum). All LEDs are programmable for maximum current and fade in/fade out times via the I2C interface. Additionally, automated blinking routines can be independently programmed and enabled for all seven LED channels. These LEDs can also be combined into groups to reduce the processor instructions. This entire configuration is driven by a two-capacitor charge pump with gains of 1×, 1.5×, and 2×. The charge pump is capable of driving a maximum IOUT of 240 mA from a supply of 2.5 V to 5.5 V. The device includes a variety of safety features including short-circuit, overvoltage, and overtemperature protection. These features allow easy implementation of a safe and robust design. Additionally, input inrush currents are limited via an integrated soft start combined with controlled input-to-output isolation. The ADP8863 is available in a compact lead frame chip scale package (LFCSP). |
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