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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87591L датащи(PDF) 192 Page - National Semiconductor (TI) |
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PC87591L датащи(HTML) 192 Page - National Semiconductor (TI) |
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192 / 437 page  Embedded Controller Modules (Continued) www.national.com 192 Revision 1.07 4.12.4 Operation Initializing the DAC The PC87591x wakes up after power-up with all the D/A channels disabled (DACEN0-3 bits in DACCTRL register are cleared to 0). In this state, all DAC activities are halted, and its current consumption is reduced to zero. DACDATn registers (n=0 to 3) must be initialized to 0016, or according to the required output level, before setting DACEN0-3 in DACCTRL register to 1. Enabling and Disabling the DAC Enabling the DAC. Each channel of the DAC is enabled independently by setting its DACEN bit. After enabling, it settles to the value stored in DACDATn register after the specified settling time. Disabling the DAC. The DAC channels may be independently disabled in order to reduce current consumption by clearing the corresponding DACENn (n=0 to 3) bit in DACCTRL register. In this case, the output pin drives 0V, even if the respective DACDATn register does not contain 0016. Figure 67. DAC Functional Diagram DAC0 DA0 DA1 DA2 DA3 AVCC AGND DAC DACDAT0 Analog Power AVCC to other modules DAC Control Register DAC1 DACDAT1 DAC2 DACDAT2 DAC3 VREF DACDAT3 IDLE AVCC VREF VREF VREF 3.3V Peripheral Bus PC87591x |
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