參數(shù)資料
型號(hào)： SI3068-B-FS
廠商： Silicon Laboratories Inc
文件頁數(shù)： 3/40頁
文件大?。?/td> 0K
描述： IC FCC+ EMBEDDED DAA 8SOIC
標(biāo)準(zhǔn)包裝： 96
功能： 直接存取裝置（DAA）
電路數(shù)： 1
電流 - 電源： *
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm Width）裸露焊盤
供應(yīng)商設(shè)備封裝： 8-SOIC-EP
包裝： 管件
包括： 結(jié)帳音調(diào)檢測，線路電壓監(jiān)視器，回路電流監(jiān)視器，過載檢測，振鈴檢測器
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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