CMX860 查看數據表（PDF） - MX-COM Inc

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CMX860

Telephone Signaling Transceiver

MX-COM Inc  

Telephone Signaling Transceiver

10

CMX860 Advance Information

The values of R24 and C22 given in Figure 4 (470kΩ and 0.33µF) give a minimum RT charge time of 100ms,

which is adequate for ring frequencies of 10Hz or above.

Note, that the circuit will also respond to a telephone line voltage reversal. If necessary, the µC can

distinguish between a Ring signal and a line voltage reversal by measuring the time that bit 14 of the Status

Register (Ring Detect) is high.

If the Ring detect function is not used then pin RD should be connected to DVSS and RT to DVDD.

3.2 Hook Detector Interface

This is identical internally to the Ring Detector interface circuit and similar components could be used

externally, with appropriate values, if hook detection is to be performed by detecting a voltage change across

the tip and ring lines to the local phone.

3.3 Line Interface

Figure 5: 2-Wire Line Interface Circuit: Application Circuits are TBD

3.4 Phone Interface

Figure 6: 2-Wire Phone Interface Circuit: Application Circuits are TBD

¤2000 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480222.001

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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