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XRP6840EVB Datasheet(PDF) 11 Page - Exar Corporation |
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XRP6840EVB Datasheet(HTML) 11 Page - Exar Corporation |
11 / 17 page X XR RP P6 68 84 40 0 4 4..3 3A A S Su up pe errcca ap pa acciitto orr F Flla as sh h L LE ED D D Drriiv ve err w wiitth h II22C C © 2009 Exar Corporation 11/17 Rev. 1.0.0 represent the DAC codes D2, D1, D0. They are used to set the flash LED current levels in each channel. Table 5 provides the DAC codes and the corresponding nominal current levels for each channel: D2-D0 Code XRP6840A IOUT/Ch. (mA) D2-D0 Code XRP6840B IOUT/Ch. (mA) 0 0 0 0 0 0 0 0 0 0 1 400 0 0 1 597 0 1 0 586 0 1 0 875 0 1 1 770 0 1 1 1127 1 0 0 948 1 0 0 1400 1 0 1 1197 1 0 1 1671 1 1 0 1291 1 1 0 1910 1 1 1 1445 1 1 1 2150 Table 5: Nominal Flash Mode Output Current LEDTORCH Register LEDTORCH register bits B2 to B7, also summarized in Table 1; they correspond to LED1, LED2 and LED3. Bits B4, B3, B2, and B1 represent the DAC codes D3, D2, D1, D0. They are used to set the torch LED current levels in each channel. Table 6 provides the DAC codes and their corresponding nominal current levels for each channel. Remember that the total current that can be supported in torch mode is 600mA divided by the gain of the charge pump. If 2 channels are set to 440mA (a total of 880mA), even with a gain of 1X, the input current limit will clamp the total current to approximately 600mA. D3-D0 Code XRP6840A IOUT/Ch. (mA) D3-D0 Code XRP6840B IOUT/Ch. (mA) 0 0 0 0 0 0 0 0 0 0 0 0 0 1 23 0 0 0 1 34 0 0 1 0 46 0 0 1 0 66 0 0 1 1 66 0 0 1 1 97 0 1 0 0 86 0 1 0 0 127 0 1 0 1 105 0 1 0 1 155 0 1 1 0 125 0 1 1 0 185 0 1 1 1 145 0 1 1 1 215 1 0 0 0 165 1 0 0 0 245 1 0 0 1 185 1 0 0 1 275 1 0 1 0 205 1 0 1 0 305 1 0 1 1 225 1 0 1 1 330 1 1 0 0 245 1 1 0 0 360 1 1 0 1 260 1 1 0 1 385 1 1 1 0 280 1 1 1 0 415 1 1 1 1 300 1 1 1 1 440 Table 6: Torch Mode Output Current Addressing and Writing Data To write data to the XRP6840 one of the following two sequences is required: Easy shutdown/startup sequence [Slave Address with write bit][Data for Status] Full shutdown/startup sequence [Slave Address with write bit][Data for Status] [Data for LEDFLASH][Data for LEDTORCH] Slave address is ‘28’ Hex. Addressing and Reading Data To read data from the XRP6840 the following sequence is required: [Slave Address with read bit][Data for Status] [Data for LEDFLASH][Data for LEDTORCH] |
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