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SI3201-BS Datasheet(PDF) 24 Page - Silicon Laboratories |
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SI3201-BS Datasheet(HTML) 24 Page - Silicon Laboratories |
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24 / 118 page  Si3215 24 Rev. 0.92 2.2.1. DC Feed Characteristics The ProSLIC has programmable constant voltage and constant current zones as depicted in Figure 14. Open circuit TIP-to-RING voltage (VOC) defines the constant voltage zone and is programmable from 0 V to 94.5 V in 1.5 V steps. The loop current limit (ILIM) defines the constant current zone and is programmable from 20 mA to 41 mA in 3 mA steps. The ProSLIC has an inherent dc output resistance (RO) of 160 Ω. Figure 14. Simplified DC Current/Voltage Linefeed Characteristic The TIP-to-RING voltage (VOC) is offset from ground by a programmable voltage (VCM) to provide voltage headroom to the positive-most terminal (TIP in forward polarity states and RING in reverse polarity states) for carrying audio signals. Table 20 summarizes the parameters to be initialized before entering an active state. 2.2.2. Linefeed Architecture The ProSLIC is a low-voltage CMOS device that uses either an Si3201 linefeed interface IC or low-cost external components to control the high voltages required for subscriber line interfaces. Figure 15 is a simplified illustration of the linefeed control loop circuit for TIP or RING and the external components used. The ProSLIC uses both voltage and current sensing to control TIP and RING. DC and AC line voltages on TIP and RING are measured through sense resistors RDC and RAC. The ProSLIC uses linefeed transistors QP and QN to drive TIP and RING. QDN isolates the high-voltage base of QN from the ProSLIC. The ProSLIC measures voltage at various nodes in order to monitor the linefeed current. RDC, RSE, and RBAT provide access to these measuring points. The sense circuitry is calibrated on-chip to guarantee measurement accuracy with standard external component tolerances. See "2.2.9. Linefeed Calibration" on page 29 for details. 2.2.3. Linefeed Operation States The ProSLIC linefeed has eight states of operation as shown in Table 21. The state of operation is controlled using the Linefeed Control register (direct Register 64). The open state turns off all currents into the external bipolar transistors and can be used in the presence of fault conditions on the line and to generate Open Switch Intervals (OSIs). TIP and RING are effectively tri-stated with a dc output impedance of about 150 k Ω. The ProSLIC can also automatically enter the open state if it detects excessive power being consumed in the external bipolar transistors. See "2.2.5. Power Monitoring and Line Fault Detection" on page 27 for more details. In the forward active and reverse active states, linefeed circuitry is on, and the audio signal paths are powered down. In the forward and reverse on-hook transmission states, audio signal paths are powered up to provide data transmission during an on-hook loop condition. The TIP Open state turns off all control currents to the external bipolar devices connected to TIP and provides an active linefeed on RING for ground start operation. The RING Open state provides similar operation with the RING drivers off and TIP active. The ringing state drives programmable ringing waveforms onto the line. Table 20. Programmable Ranges of DC Linefeed Characteristics Parameter Programmable Range Default Value Register Bits Location* ILIM 20 to 41 mA 20 mA ILIM[2:0] Direct Register 71 VOC 0 to 94.5 V 48 V VOC[5:0] Direct Register 72 VCM 0 to 94.5 V 3 V VCM[5:0] Direct Register 73 *Note: The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped directly. V (TIP-RING) (V ) V OC Constant Voltage Zone R O=160 Ω Constant Current Zone I LIM I LOOP(m A ) |
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