参数资料
型号: SI3066-B-FS
厂商: Silicon Laboratories Inc
文件页数: 3/40页
文件大小: 0K
描述: IC DAA ENH FCC LINE-SIDE 8SOIC
标准包装: 96
功能: 直接存取装置(DAA)
电路数: 1
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm Width)裸露焊盘
供应商设备封装: 8-SOIC-EP
包装: 管件
包括: 结帐音调检测,线路电压监视器,回路电流监视器,过载检测,振铃检测器
Si3066
Rev. 1.0
11
4.4. Loop Current Sensing
The Si3066 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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