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ST75C540 数据表(PDF) 59 Page - STMicroelectronics

部件名 ST75C540
功能描述  SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES
PDF  84 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST75C540 数据表(HTML) 59 Page - STMicroelectronics

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BIQUADRATIC
FILTER
#3
LEVEL #3
POWER
#3
POWER
#4
POWER
#5
LEVEL #4
LEVEL #5
COMP.
#4
COMP.
#3
COMP.
#5
D3
D4
D5
BIQUADRATIC
FILTER
#5
BIQUADRATIC
FILTER
#4
Rx SIGNAL
GROUND
@00
@01
@02
@03
@13
@14
@15
@23
@33
@24
@34
@25
@35
TONEDET0
2
2
Figure 22 : Wiring Example
IX.3 - Example
IX - TONE DETECTORS (continued)
Hereunder is an example of programming a single
Tone detection (using Cell #3) and a complex dif-
ferential tone detection (using Cell #4 and #5).
Bit 3 of the TONEDET variable will be triggered
each time the energy of that filtered signal is higher
than Static Level number 3.
Bit 4 of the TONEDET variable will be on each time
a receive signal has an energy higher than the
Static Level number 4. Bit 5 will be on only when
the Filtered (Filter section 4 and 5) received signal
higher than the energy of the wide-band signal
number 4 ; this prevents triggering on noise.
Program Cell #3 :
TDWW
0300
1301
Connect Received signal to Filter and Filter to Energy.
TDWW
0301
3323
Connect Level to Comparator Neg Input and Energy to Pos Input.
Program Cell #4 and #5 :
TDWW
0400
0101
Connect Received Signal to Filter and Energy.
TDWW
0401
3424
Connect Level to Comparator Neg Input and Energy to Pos Input.
TDWW
0500
1514
Connect Filter#4 Output to Filter and Filter to Energy.
TDWW
0501
2425
Connect Wide-band Energy to Neg Input and Energy to Pos Input.
ST75C530 - ST75C540
59/84



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