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SI3066 Datasheet(PDF) 10 Page - Silicon Laboratories |
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SI3066 Datasheet(HTML) 10 Page - Silicon Laboratories |
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10 / 40 page  Si3066 10 Rev. 1.0 4. Telephone Line Interface Functional Description Together, the integrated system-side and Si3066 comprise an integrated direct access arrangement (DAA) that provides a programmable line interface to meet the telephone line interface requirements of countries worldwide. The device implements Silicon Laboratories’ patented isolation technology, which offers the highest level of integration by replacing an analog front end (AFE), an isolation transformer, relays, opto- isolators, a 2- to 4-wire hybrid, and other circuitry. The Si3066 can be fully programmed to meet international requirements and is compliant with FCC, JATE, and numerous other country-specific PTT specifications as shown in Table 5. Also, the Si3066 meets the most stringent requirements for out-of-band energy, emissions, immunity, lightning surges, and safety. 4.1. Initialization The following is an example initialization procedure: 1. Select the desired sample rate using the SRC bits (Register 7, bits 3:0). 2. Power up the line side by clearing the PDL bit (Register 6, bit 4). 3. Enable AOUT (if applicable) by setting ARM[7:0] (Register 20, bits 7:0) and ATM[7:0] (Register 21, bits 7:0) to the desired level. 4. Prior to receiving or transmitting data, ensure FDT (Register 12) is set indicating the Si3066 is ready for normal operation. After the procedure is complete, the DAA is ready for off-hook, on-hook line monitoring, and ring detection. 4.2. Isolation Barrier The Si3066 achieves an isolation barrier through low- cost, high-voltage capacitors in conjunction with Silicon Laboratories’ proprietary signal processing techniques. These techniques eliminate signal degradation from capacitor mismatches, common mode interference, or noise coupling. The C1, C2, C8, and C9 capacitors isolate the system-side device from the Si3066 line-side device. All transmit, receive, control, ring detect, and caller ID data are communicated through this barrier. Y2 class capacitors can be used to achieve surge performance of 6 kV or greater. The isolated communications link is disabled by default. To enable it, the PDL bit (Register 6, bit 4) must be cleared. No communication between the system-side and Si3066 can occur until this bit is cleared and the FDT bit (Register 12, bit 6) is high. 4.3. Parallel Handset Detection The Si3066 can detect a parallel handset going off- hook. When the DAA is off-hook, the loop current can be monitored via the LCS bits (Register 12, bits 4:0). A significant drop in loop current can signal a parallel handset going off-hook. If a parallel handset causes the LCS bits to read 0s, the DropOut Detect Interrupt bit (Register 4, bit 3) can be checked to verify that a valid line still exists. For the Si3066 to operate in parallel with another handset, the parallel handset must have a sufficiently high dc termination impedance to support two DAAs off hook on the same line. Table 5. Country-Specific PTT Specifications Country Argentina Kyrgyzstan Armenia Macao Bahamas Mexico Bangladesh Moldova Belarus New Zealand2 Bermuda Paraguay Brazil Peru Brunei Puerto Rico Canada Russia Caribbean Saudi Arabia Chile Singapore China South Korea3 Colombia Sri Lanka Costa Rica Taiwan Dominican Republic Thailand Ecuador Tunisia El Salvador UAE Georgia Ukraine Guam Uruguay Hong Kong Uzbekistan India USA Indonesia Venezuela Japan1 Vietnam Kazakhstan Yemen Kuwait Notes: 1. DCR exceeds 300 Ω; disclaimer required in product documentation. 2. 600 Ω ac termination used; disclaimer required in product documentation. 3. Additional components required to pass ringer impedance specifications. |
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