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M-991 Datasheet(PDF) 3 Page - Clare, Inc. |
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M-991 Datasheet(HTML) 3 Page - Clare, Inc. |
3 / 6 page Data/Tone Selection D0 D1 D2 D3 Frequency (Hz) Use 12 0000 350 440 Dial Tone 0 0 0 1 400 off Special 0010 440 off Alert Tone 0011 440 480 Audible Ring 0100 440 620 Pre-empt 0101 480 off Bell high tone 0110 480 620 Reorder(Bell low) 0111 350 off Special 1000 620 off Special 1001 941 1209 DTMF “ *” Pin Function Pin Function CE Latches data and enables output (active low input). D0 - D3 Data input pins. (See Data/Tone Selection.) D4-D5 Leave open. MUTE Output indicates that a signal is being generated at OUTDRIVE. OUTDRIVE Linear buffered tone output. V DD Most positive power supply input pin. V REF Internally generated mid-power supply voltage (output). V SS Most negative power supply input pin. X IN Crystal oscillator or digital clock input. X OUT Crystal oscillator output. M-991 www.clare.com 3 Rev. 1 Call Progress Tone Generation Call progress tones are audible tones sent from switching systems to calling parties (or equipment) to indicate the status of calls. Calling parties can identify the success of a placed call by what is heard after dial- ing. The M-991 series utilizes a highly linear tone gen- erator that produces the unique frequencies (singly or in pairs) that are common to call progress signals. Duration and frequency selection are digitally con- trolled (see the Data/Tone Selection table below for data settings for a particular tone output). A typical control sequence for the M-991 is: (1) set data lines to desired frequency selection, (2) wait for data lines to settle, (3) drive the chip enable (CE) low, (4) maintain CE low for desired tone duration (Note: data lines may be changed after data hold time), and (4) return CE to a logic high. (Commonly used call progress tones are shown in the Data/Tone Selection table below.) In a bus-oriented system, noise on the data lines may propagate through the device and appear at the out- put. To safeguard against this, use an external latch to lock the data into the device. In addition, it is good practice to bypass the V REF pin to ground with a small capacitor (0.01 mF) to reduce power supply noise. The designer should be aware of device timing require- ments and design accordingly. The data input pins may be tied high (+5 VDC) or low (ground) as required, but D4 and D5 must be left open. Beware of hardwiring the CE pin for dedicated tone generation. This input is edge triggered. An RC network like that shown in the Power-on Reset Circuit on Page 4 should be used to momentarily reset the device immediately following power-up to ensure proper operation. Standard Call Progress Tones Tone Name Frequency (Hz) Interruption Rate 12 Dial 350 440 Steady Reorder 480 620 Repeat, tones on and off 250 ms ± 25 ms each. Busy 480 620 Repeat, tones on and off 500 ms ± 50 ms each. Audible Ring 440 480 Reat, tones on 2 ± 0.2 s, tones off 4 ± 0.4 s Recall Dial 350 440 Three bursts tones on and off 100 ms ± 20 ms each followed by dial tone. Special AR 440 480 Tones on 1 ± 0.2s, followed by single 440 Hz on for 0.2s on, and silence for 3 ± 0.3 s, repeat. Intercept 440 620 Repeat alternating tones, each on for 230 ms ± 70 ms with total cycle of 500 ± 50 ms. Call Waiting 440 Off One burst 200 ± 100 ms Busy Verification 440 Off One burst of tone on 1.75 ± 0.25 s before attendant intrudes, followed by burst of tone 0.65 ± 0.15 s on, 8 to 20 s apart for as long as the call lasts Executive Override 440 Off One burst of tone for 3 ± 1 s before overriding station intrudes Confirmation 350 440 Three bursts on and off 100 ms each or 100 ms on, 100 ms off, 300 ms on |
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