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LTC3219用户指南
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简介
the ltc®3219是250mA的LED驱动器，照亮发光二极管（uleds 9万）。uleds are considered the环球因为他们可以单独被金关闭，设置在通用输出（GPO）模式，set to眨眼在选定的时间周期，我们与黄金大我们与off at选定的级配的脾脏。本装置还has an external使（ENU）松that may be used to眨眼，把大，金我们/ off the LED without using the I2C总线。this may be如果是在睡眠的微处理器或待机模式。如果使用恰当，这些特征可以保存价值的记忆空间，时间和I2C编程，减少交通。
集成电路控制
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.
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