Maxim Integrated 73M1822/73M1922 Implementers Guide - Manual (Page 13)

UG_1x22_052 73M1822/73M1922 Implementer’s Guide
Rev. 1.0 13
4 On-Hook Procedures
The on-hook procedures described in this section include:
• CID Mode
• Off-Hook Request
• Ring Detection and Line Voltage Reversal
• Line-in-use and Loss of Battery Feed
4.1 CID Mode
It is possible (while on hook) to allow the RGP/RGN input, which is AC coupled to the line through high
voltage capacitors, to be transmitted on the MAFE interface. This allows the host to listen for Caller ID
information without going off hook.
The registers used in this procedure are:
0x14 TXBST DAA1 DAA0 Res RXBST RLPNH RXG1 RXG0
Write X X X X 1 X X X
0x15 ENOLD DISNTR Res CIDM THEN ENUVD ENOVD ENOID
Write X X 0 1 X X X X
Begin
1. Set RXBST = 1 (Write RG14 = xxxx1xxx).
2. Set CIDM = 1 (write RG15 = xx11_xxxx).
End
CID Mode
RXBST =1
CIDM =1
End