PC87591L datasheet(192/437 Pages) NSC

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Embedded Controller Modules (Continued)

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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

DAC1

DACDAT1

DAC2

DACDAT2

DAC3

VREF

DACDAT3

IDLE

AVCC

VREF

3.3V

Peripheral Bus

PC87591x

PC87591L 데이터시트(PDF) 192 Page - National Semiconductor (TI)

PC87591L 데이터시트(HTML) 192 Page - National Semiconductor (TI)

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