PC87591L datasheet(12/437 Pages) NSC

12 / 437 page

Table of Contents (Continued)

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Revision 1.07

Initializing the ADC ............................................................................................ 174

Enabling and Disabling the ADC ....................................................................... 174

Interrupt Structure .............................................................................................. 175

ADC Operating Principles .................................................................................. 175

Reading Measurement Results ......................................................................... 176

Failure Detection ................................................................................................ 177

4.11.6

ADC Registers ........................................................................................................... 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

4.11.7

Usage Hints ............................................................................................................... 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

4.12

DIGITAL TO ANALOG CONVERTER (DAC) .......................................................................... 190

4.12.1

Features .................................................................................................................... 190

4.12.2

Functional Description ............................................................................................... 190

4.12.3

D/A Conversion ......................................................................................................... 190

Output Signal ..................................................................................................... 190

Reference Voltage ............................................................................................. 191

Conversion Time ................................................................................................ 191

4.12.4

Operation ................................................................................................................... 192

Initializing the DAC ............................................................................................ 192

Enabling and Disabling the DAC ....................................................................... 192

4.12.5

DAC Registers ........................................................................................................... 193

DAC Register Map ............................................................................................. 193

DAC Control Register (DACCTRL) .................................................................... 193

DAC Data Channel 0-3 Registers (DACDAT0-3) .............................................. 194

4.12.6

Usage Hints ............................................................................................................... 194

Power Consumption .......................................................................................... 194

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