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AS2534RT Datasheet(PDF) 9 Page - ams AG |
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AS2534RT Datasheet(HTML) 9 Page - ams AG |
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9 / 26 page  Data She et AS25 33-36 austriamicrosystems Revision 8.10 Page 8 of 25 Low group Digit 1-2-3-A 697 Hz Digit 4-5-6-B 770 Hz Digit 7-8-9-C 852 Hz Digit * -0-# -D 941 Hz High group Digit 1-4-7- * 1209 Hz Digit 2-5-8-0 1336 Hz Digit 3-6-9-# 1477 Hz Digit A-B-C-D 1633 Hz (not AS2535) The MF output level can be set with an external voltage divider on pin MFL. Voltage at pin MFL (2) DTMF Level (Low Grp.) AGND typ. 1.50* V -4.0 dBm 0.878 * AGND 1.317 V -5.2 dBm 0.791 * AGND 1.187 V -6.4 dBm 0.705 * AGND 1.058 V -7.6 dBm 0.620 * AGND 0.930 V -8.8 dBm 0.495 * AGND 0.743 V -10.0 dBm 0.372 * AGND 0.558 V -11.2 dBm 0.290 * AGND 0.435 V -12.4 dBm 0.210 * AGND 0.315 V -13.6 dBm 0.130 * AGND 0.195 V -14.8 dBm VSS 0.000 V (VSS) -16.0 dBm (ZLINE = 600) *typical MFL values for AGND = 1.5V The preemphasis is 2.6 dB. The MF tones are according to CEPT recommendations. Tone Ringer (Melody/Volume) The three basic frequencies of the melodies are: F1 = 800 Hz, F2 = 1067 Hz, and F3 = 1333 Hz (± 5%). The repetition rate and the volume of the tone ringer melodies can be programmed by pressing P/M and # followed by a digit as follows: Digit Repetition Rate Volume 1 1 time (50 ms pause) - 16 dB 2 1 time (50 ms pause) - 7 dB 3 1 time (50 ms pause) 0 dB (max.) 4 4 times - 16 dB 5 4 times - 7 dB 6 4 times (default, AS2534R) 0 dB (max.) 7 10 times - 16 dB 8 10 times - 7 dB 9 10 times 0 dB (max.) 0 None Off The procedure is ended by repressing the P/M key. The default setting is digit 6, i.e. after a power on reset the device will start up with repetition rate 4 and maximum volume. If digit 0 is programmed, the tone ringer will be turned off until next off-hook where it will turn back to the last setting before 0. The programmed settings are stored in the on chip RAM. Repetition rate means that a sequence of 6 frequencies is repeated 1, 4 or 10 times within 1 second. The sequence of the frequencies is controlled by the sequence register as follows: Sequence F1 F2 F3 F1 F2 F3 … Pacifier Tone By MF dialing the DTMF tones are provided to the earpiece as comfort tone. During programming a key entry is acknowledged by a pacifier tone of 1477 Hz. The level of the pacifier tone is approximately 60 mV at the RO output. The duration is 40 ms after every key entry in program mode. When terminating the program mode with the P/M key an acknowledge tone of 140 ms is provided. An invalid key entry, however, will cause a termination of the program mode indicated by a rejection tone of 4 times 40 ms with 28 ms pauses between the tone bursts. Ring Frequency Discrimination The ring frequency discriminator assures that only signals with a frequency between 13Hz and 70 Hz are regarded as valid ring signals. The time for recognizing a valid ring signal is 1/f seconds, where 'f' is the ring frequency. When a valid ring signal is present for 73 ms continuously, the melody generator is activated and remains active as long as the ring signal is present. Once the melody generator has been started, the ring signal is continuously monitored and the melody generator is instantly turned on or off according to the momentary presence of a valid or invalid ring signal respectively (until next POR or off-hook). |
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