Maxim Integrated 73M1822/73M1922 Implementers Guide - Manual (Page 3)

UG_1x22_052 73M1822/73M1922 Implementer’s Guide
Rev. 1.0 3
Table of Contents
1 Introduction ................................................................................................................................... 4
1.1 Procedure Conventions ............................................................................................................ 4
1.2 Read-Modify-Write Procedure .................................................................................................. 4
2 Hardware Requirements ................................................................................................................ 5
2.1 Reset ....................................................................................................................................... 5
2.2 Crystal Oscillator ...................................................................................................................... 5
2.3 MAFE Interface ........................................................................................................................ 5
2.4 Interrupts ................................................................................................................................. 5
3 Device Configuration and Initialization......................................................................................... 6
3.1 Host-Side Device (73M1902) Configuration .............................................................................. 6
3.1.1 Reset and Disable Interrupts ....................................................................................... 6
3.1.2 MAFE Interface Configuration ...................................................................................... 7
3.1.3 Clock and Sample Rate Management .......................................................................... 7
3.2 Line-Side Device (73M1912) Configuration .............................................................................. 8
3.2.1 Barrier Synchronization Recovery ................................................................................ 8
3.2.2 Initial Line State Configuration ................................................................................... 11
4 On-Hook Procedures ................................................................................................................... 13
4.1 CID Mode .............................................................................................................................. 13
4.2 Off-Hook Request .................................................................................................................. 14
4.3 Ring Detection and Line Voltage Reversal ............................................................................. 16
4.4 Line-in-use and Loss of Battery Feed ..................................................................................... 19
5 Off-Hook Procedures ................................................................................................................... 20
5.1 Barrier Synch Loss................................................................................................................. 20
5.2 On-hook Request ................................................................................................................... 20
5.3 Parallel Pickup Event Detection.............................................................................................. 20
6 Interrupt Processing .................................................................................................................... 21
6.1 GPIO Interrupt ....................................................................................................................... 21
6.2 DET Interrupt ......................................................................................................................... 22
6.3 SYNL Interrupt ....................................................................................................................... 22
6.4 RGDT and RGMON Interrupts ............................................................................................... 23
7 Register Summary ....................................................................................................................... 24
8 Related Documentation ............................................................................................................... 25
9 Contact Information ..................................................................................................................... 25
Revision History .................................................................................................................................. 26
Figures
Figure 1: Ring Detection ........................................................................................................................ 16
Figure 2 : Ring Circuit ............................................................................................................................ 16
Figure 4: Line Voltage Measurement Circuit ........................................................................................... 19
Figure 3 : Battery Feed and Line-in-Use Detection ................................................................................. 19