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SI3068-B-FS 데이터시트(PDF) 11 Page - Silicon Laboratories |
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SI3068-B-FS 데이터시트(HTML) 11 Page - Silicon Laboratories |
11 / 40 page Si3068 Rev. 1.0 11 4.4. Loop Current Sensing The Si3068 measures loop current when off-hook. The LCS[4:0] bits measure loop current with 3.3 mA/bit resolution. The following functions can be performed with the LCS bits: While off-hook, detect if a parallel phone goes on- or off-hook. Determine if sufficient loop current is available for proper operation. Detect if there is an overload condition. 4.4.1. Loop Current Measurement When the DAA is off-hook, the LCS[4:0] bits measure loop current with 3.3 mA/bit resolution. These bits can be used to detect another device going off-hook by monitoring the dc loop current. The transfer function for LCS is shown in Figure 6 and is detailed in Table 6. The LCS bits report loop current down to the minimum operating loop current for the DAA. Below this threshold, the reported value of loop current is unpredictable and may vary between zero and the minimum operating current. When the LCS bits have reached their maximum value, the Loop Current Sense Overload Interrupt bit fires; however, LCSOI firing does not necessarily guarantee that an overload situation has occurred. Figure 6. Typical LCS Transfer Function 0 13.2 160 102.3 Loop Current (mA) LCS BITS 0 5 10 15 20 25 30 Overload Table 6. Loop Current Sense Transfer Function LCS[4:0] Condition 00000b – 00011b Insufficient line current for normal operation. Use the DODI bit (Register 4, bit 3) to determine if a line is still connected. 00100b – 11110b Normal operation. 11111b Loop current is excessive (>160 mA). |
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