CMX615 查看數據表（PDF） - MX-COM Inc

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CMX615

Digital Line to POTS Interface

MX-COM Inc  

Digital Line to POTS Interface

CMX615

1.5 General Description

The CMX615 is a telecom tone generator and DTMF tone encoder. It has separate output ports for the three

different classes of signals encoded. These include Ringing signal, In-band tones or FSK data at 1200bps and

High frequency metering pulses (SPM tones). It has a transmit level attenuator for In-band tones or FSK data

and an envelope control for SPM tones. It also has an uncommitted amplifier and uses the industry standard

3.58MHz Xtal for its oscillator. These functions are controlled over a ‘C-BUS‘ serial µC interface, which also

carries the transmit FSK data.

The CMX615 may be powersaved into ‘Zero-Power’ mode for minimum power consumption by issuing a

‘C-BUS’ RESET command. Individual functions may be powersaved by the use of bits 6 and 7 in the SETUP

Register. Not powersaving the Tx Powersave (set bit 6 of the SETUP Register to ‘1’) will take the Tx functions

(tone/FSK encoding, DTMF, SPM and Ringing signal generation) out of powersave. Not powersaving the

Uncommitted Amplifier (Set bit 7 of the SETUP Register to ‘1’) will take the amplifier out of powersave.

Approximately 50ms should be allowed for the Tx dc level to settle at VBIAS before enabling the Tx functions

(set bit 6 of the MODE Register to ‘1’).

1.5.1 Xtal Osc and Clock Dividers

Frequency and timing accuracy of the CMX615 is determined by a 3.579545MHz clock present at the

XTAL/CLOCK pin. This may be generated by the on-chip oscillator inverter using the external components C1,

C2 and X1 of Figure 2, or may be supplied from an external source to the XTAL/CLOCK input. If the clock is

supplied from an external source, C1, C2 and X1 should not be fitted.

The on-chip oscillator is turned off in the 'Zero-Power' mode.

If the clock is provided by an external source which is not always running, then the 'Zero-Power' mode must be

set when the clock is not available. Failure to observe this rule may cause a rise in the supply current drawn by

CMX615.

1.5.2 Uncommitted Amplifier

This amplifier, with suitable external components, can be used for adjusting the transmit signal level (for the

line hybrid).

1.5.3 Tone/FSK Encoder and Tone Encoder

When bit 5 of the MODE Register is set to ‘1’ then these blocks generate FSK signals as determined by bit 0

of the SETUP Register and the Tx data bits from the UART block, as shown in the table below:

SETUP Register

Bit 0

0

1

Tone/FSK Generator

V23 1200bps FSK

Bell 202 1200bps FSK

FSK Signal Frequency

‘0’ (Space)

2100Hz

2200Hz

FSK Signal Frequency

‘1’ (Mark)

1300Hz

1200Hz

When bit 5 of the MODE Register is set to ‘0’, these blocks generate single or dual tones from the range

shown in the tables on the following pages. Bit 6 of the MODE Register is then used to enable or disable the

block’s output to the Tx Signal Control, RING and TONEFSK outputs. There are four tone fields addressed by

bits 0 and 1 of the MODE Register.

© 1999 Consumer Microcircuits Limited

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D/615/4

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