LTC3219用戶指南

　　簡介

　　the ltc?3219是250mA的LED驅(qū)動器，照亮發(fā)光二極管（uleds 9萬）。uleds are considered the環(huán)球因?yàn)樗麄兛梢詥为?dú)被金關(guān)閉，設(shè)置在通用輸出（GPO）模式，set to眨眼在選定的時間周期，我們與黃金大我們與off at選定的級配的脾臟。本裝置還has an external使（ENU）松that may be used to眨眼，把大，金我們/ off the LED without using the I2C總線。this may be如果是在睡眠的微處理器或待機(jī)模式。如果使用恰當(dāng)，這些特征可以保存價(jià)值的記憶空間，時間和I2C編程，減少交通。

　　集成電路控制

　　The LTC3219 has 12 data registers， each with its own subaddress as shown in Table 2. The data is loaded into the registers when the device receives a Stop bit. This device is written using the standard I2C protocol. A 7-bit slaveaddress and Write bit is followed by the 8-bit sub-address byte and an 8-bit data byte. The LTC3219 is a slave I2C device that only can receive data.

　　DATA BYTES

　　REG0（Tables 3 and 4） is used to set the charge pump to Auto， Force 1x， Force 1.5x， or Force 2x modes. It is also used to prepare for a Quick Write， or set the gradation UP bit. REG1 through REG9 set the intensity and mode for the nine individual ULEDs （Table 5）。 REG10 is used to select ULED1 to ULED8 for ENU control， as shown in Table 6. REG11 is separated into three portions as illustrated in Table 7. D0 is used to select ULED9 for ENU control. D1 and D2 are used to control the gradation time， while D3 and D4 are used to select the blinking on-time and period.