pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 12

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

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Table of Contents
4.12
4.11.2
4.11.3
4.11.4
4.11.5
4.11.6
DIGITAL TO ANALOG CONVERTER (DAC) .......................................................................... 179
4.12.1
4.12.2
4.12.3
4.12.4
4.12.5
4.12.6
Functional Description ............................................................................................... 166
Voltage Measurement ............................................................................................... 167
ADC Operation .......................................................................................................... 168
ADC Registers ........................................................................................................... 171
Usage Hints ............................................................................................................... 176
Features .................................................................................................................... 179
Functional Description ............................................................................................... 179
D/A Conversion ......................................................................................................... 179
Operation ................................................................................................................... 181
DAC Registers ........................................................................................................... 181
Usage Hints ............................................................................................................... 183
(Continued)
Reset .................................................................................................................... 168
ADC Clock ............................................................................................................ 168
Initializing the ADC ............................................................................................... 168
Enabling and Disabling the ADC .......................................................................... 169
Interrupt Structure ................................................................................................ 169
ADC Operating Principles .................................................................................... 169
Reading Measurement Results ............................................................................ 170
Failure Detection .................................................................................................. 170
ADC Register Map ............................................................................................... 171
ADC Status Register (ADCSTS) .......................................................................... 171
ADC Configuration Register (ADCCNF) ............................................................... 172
ADC Clock Control Register (ACLKCTL) ............................................................. 172
ADC Delay Control Register (ADLYCTL) ............................................................. 172
ADC Parameters Index Register (ADCPINX) ....................................................... 173
ADC Parameters Data Register (ADCPD) ........................................................... 173
Voltage Channel 1 Control Register (VCHN1CTL) .............................................. 174
Voltage Channel 1 Data Buffer (VCHN1DAT) ...................................................... 174
Voltage Channel 2 Control Register (VCHN2CTL) .............................................. 175
Voltage Channel 2 Data Buffer (VCHN2DAT) ...................................................... 175
Voltage Channel 3 Control Register (VCHN3CTL) .............................................. 176
Voltage Channel 3 Data Buffer (VCHN3DAT) ...................................................... 176
Power Supply and Layout Guidelines .................................................................. 176
Power Consumption ............................................................................................. 176
Back-Drive Protection ........................................................................................... 176
Measuring Out of Range Voltages ....................................................................... 176
Filtering the Noise on Voltage Input Signals ........................................................ 177
Calculating the Voltage Channel Delay ................................................................ 177
Thermistor-Based Temperature Measurement .................................................... 177
Output Signal ........................................................................................................ 179
Reference Voltage ................................................................................................ 180
Conversion Time .................................................................................................. 180
Initializing the DAC ............................................................................................... 181
Enabling and Disabling the DAC .......................................................................... 181
DAC Register Map ............................................................................................... 181
DAC Control Register (DACCTRL) ...................................................................... 182
DAC Data Channel 0-3 Registers (DACDAT0-3) ................................................. 182
Power Consumption ............................................................................................. 183
DAC Output Protection ......................................................................................... 183
Output Voltage Accuracy ...................................................................................... 183
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Revision 1.2