基于SX105x的多路可编LED驱动设计及应用

Semtech 公司的SX1507, SX1508和SX1509是超低功耗4/8/16路通用并行输入/输出(GPIO)扩展器,并集成了LED驱动器,工作电压1.2V-3.6V,主要用在手机,PDA,MP3播放器,数码相机,笔记本电脑,GPS和其它以电池为能源的设备.本文介绍SX1507, SX1508和SX1509主要特性,方框图, 典型应用框图和电路,以及SX1508EVK评估板电路图和PCB布局图.The SX1507, SX1508 and SX1509 are complete ultra low voltage 1.2V to 3.6V General Purpose parallel Input/Output (GPIO) expanders ideal for low power handheld battery powered equipment. This family of GPIOs comes in 4-, 8-, 16-channel configuration and allows easy serial expansion of I/O through a standard 400kHz I2C interface. GPIO devices can provide additional control and monitoring when the microcontroller or chipset has insufficient I/O ports, or in systems where serial communication and control from a remote location is advantageous. These devices can also act as a level shifter to connect a microcontroller running at one voltage level to a component running at a different voltage level, thus eliminating the need for extra level translating circuits. The core is operating as low as 1.425V while the dual I/O banks can operate between 1.2V and 3.6V independent of the core voltage and each other (5.5V tolerant).The SX1507, SX1508 and SX1509 feature a fully programmable LED Driver with internal oscillator for enhanced lighting control such as intensity (via 256- step PWM), blinking and breathing (fade in/out) make them highly versatile for a wide range of LED addition, keypad application is also supported with the on-chip scanning engine which enables continuous keypad monitoring up to 64 keys without any additional host interaction and further reduce the bus e SX1507, SX1508 and SX1509 have the ability to generate mask-programmable interrupts based on falling/rising edge of any of its GPIO lines. A dedicated pin indicates to a host controller that a state change occurred in one or more of the ch GPIO is programmable via 8-bit configuration registers such as data registers, direction registers, pull-up/pull-down registers, interrupt mask registers and interrupt registers. These I/O expanders come in small footprint packages and are rated from -40℃ to +85℃ temperature 105x主要特性:1.2V to 3.6V Low Operating Voltage with Dual Independent I/O Rails (VCC1, VCC2)Enable Direct Level Shifting Between I/O Banks and Host Controller5.5V Tolerant I/Os, Up to 15mA Output Sink on All I/Os (No Total Sink Current Limit)Integrated LED Driver for Enhanced LightingIntensity Control (256-step PWM)Blink Control (224 On/Off values)Breathing Control (224 Fade In/Out values)On-Chip Keypad Scanning EngineSupport Up to 8x8 Matrix (64 Keys)Configurable Input Debouncer4/8/16 Channels of True Bi-directional Style I/OProgrammable Pull-up/Pull-downPush/Pull or Open-drain outputsProgrammable PolarityOpen Drain Active Low Interrupt Output (NINT)Bit MaskableProgrammable Edge SensitivityBuilt-in Clock Management (Internal 2MHz Oscillator/External Clock Input, 7 clock values)OSCIO can be Configured as GPO400kHz I2C Compatible Slave Interface4 User-Selectable I²C Slave AddressesPower-On Reset and Reset Input (NRESET)Ultra Low Current Consumption of typ. 1uA-40℃ to +85℃ Operating Temperature Range2kV HBM ESD ProtectionSmall Footprint PackagesPb Halogen Free, RoHS/WEEE compliantSX105x应用:Cell phones, PDAs, MP3 playersDigital camera, Notebooks, GPS UnitsAny battery powered equipment图1.4路SX1507方框图图2.8路SX1508方框图

碧莲盛

碧莲盛植发

宁波碧莲盛植发