pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 12

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

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Table of Contents
4.12
4.11.6
4.11.7
DIGITAL TO ANALOG CONVERTER (DAC) .......................................................................... 190
4.12.1
4.12.2
4.12.3
4.12.4
4.12.5
4.12.6
ADC Registers ........................................................................................................... 177
Usage Hints ............................................................................................................... 185
Features .................................................................................................................... 190
Functional Description ............................................................................................... 190
D/A Conversion ......................................................................................................... 190
Operation ................................................................................................................... 192
DAC Registers ........................................................................................................... 193
Usage Hints ............................................................................................................... 194
(Continued)
Initializing the ADC ............................................................................................ 174
Enabling and Disabling the ADC ....................................................................... 174
Interrupt Structure .............................................................................................. 175
ADC Operating Principles .................................................................................. 175
Reading Measurement Results ......................................................................... 176
Failure Detection ................................................................................................ 177
ADC Register Map ............................................................................................. 177
ADC Status Register (ADCSTS) ........................................................................ 178
ADC Configuration Register (ADCCNF) ............................................................ 179
ADC Clock Control Register (ACLKCTL) ........................................................... 179
ADC Delay Control Register (ADLYCTL) .......................................................... 180
Local Diode Overtemperature Limit Register (TLOCOTL) ................................. 181
ADC Parameters Index Register (ADCPINX) .................................................... 181
ADC Parameters Data Register (ADCPD) ......................................................... 181
Temperature Channel Control Register (TCHANCTL) ...................................... 182
Temperature Channel Data Buffer (TCHANDAT) .............................................. 182
Voltage Channel 1 Control Register (VCHN1CTL) ............................................ 183
Voltage Channel 1 Data Buffer (VCHN1DAT) ................................................... 184
Voltage Channel 2 Control Register (VCHN2CTL) ............................................ 184
Voltage Channel 2 Data Buffer (VCHN2DAT) ................................................... 184
Voltage Channel 3 Control Register (VCHN3CTL) ............................................ 185
Voltage Channel 3 Data Buffer (VCHN3DAT) ................................................... 185
Power Supply and Layout Guidelines ................................................................ 185
Power Consumption .......................................................................................... 185
Back-Drive Protection ........................................................................................ 185
Measuring Out of Range Voltages ..................................................................... 185
Filtering the Noise on Voltage Input Signals ...................................................... 186
Calculating the Voltage Channel Delay ............................................................. 186
Thermistor-Based Temperature Measurement .................................................. 186
Remote Diode Selection .................................................................................... 187
Filtering the Noise on Temperature Input Signals ............................................. 187
Calculating the Temperature Channel Delay ..................................................... 188
PC Board Layout ............................................................................................... 188
Twisted Pair and Shielded Cables ..................................................................... 189
Output Signal ..................................................................................................... 190
Reference Voltage ............................................................................................. 191
Conversion Time ................................................................................................ 191
Initializing the DAC ............................................................................................ 192
Enabling and Disabling the DAC ....................................................................... 192
DAC Register Map ............................................................................................. 193
DAC Control Register (DACCTRL) .................................................................... 193
DAC Data Channel 0-3 Registers (DACDAT0-3) .............................................. 194
Power Consumption .......................................................................................... 194
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Revision 1.07