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AN273 Datasheet(PDF) 5 Page - Silicon Laboratories |
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AN273 Datasheet(HTML) 5 Page - Silicon Laboratories |
5 / 8 page AN273 Rev. 0.1 5 If RSH is not installed, a resistive fault present between TIP and RING will provide enough loop current to cause the voltage on the TIP lead to drop. Since all of the loop current passes through the resistive fault, RTR, the equation for RTR becomes as follows: Equation 5. 4.3. Condition 3: TIP to GND Fault Resistive faults from TIP to GND are also detected in the TIP-OPEN linefeed state. In this case, the resistive fault from TIP to GND (RTG) reduces the longitudinal current through RST (see Figure 4); thus, a more positive voltage is present at the TIP terminal. Equation 6 describes RTG as a function of the TIP and RING voltages. Note that the denominator is the same as in the RTR calculation; so, the same critical voltage applies. Figure 4. TIP-OPEN Linefeed State with TIP to GND Resistive Fault From the voltages measured at TIP and RING, the resistive fault from TIP to GND may be expressed as follows: Equation 6. If RSH is not installed, a gross measurement of the impedance from TIP-GND may be made in the FORWARD ACTIVE linefeed state. By applying a high common-mode voltage to TIP and keeping the differential voltage to 0 V (VOC = 0), a resistive fault will form a voltage divider along with the 160 Ω output impedance of the TIP lead in the FORWARD ACTIVE state (see Figure 5). RTR RST VRING VTIP – () 1.5 VTIP + --------------------------------------------------------- = TIP RING RST RSR RSH RTG 1.5 V VOC RTG VTIP – RST × RSH × RSH 1.5 VTIP + () R ST VRING VTIP – () – ------------------------------------------------------------------------------------------------------------- = |
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