Specifications

AN93
Rev. 0.8 11
Figure 3. Typical Loop Voltage LVCS Transfer Function
Figure 4. Typical Loop Current LVCS Transfer Function
Table 4. Loop Current Transfer Function
LVCS[4:0] Condition
00000 Insufficient line current for normal
operation. Use the DOD bit (Register 19,
bit 1) to determine if a line is still
connected.
00001 Minimum line current for normal operation.
11111 Loop current is excessive (overload).
Overload > 140 mA in all modes except
CTR21.
Overload > 56 mA in CTR21 mode.
0 3 6 9 12 15 18 21 24 30 33 36 39 42 4548 51 54 57 60 63 66 69
72
140
75 78 81 84 87 90 93
Loop Current
(mA)
LVCS
BITS
27
Overload
0
5
10
15
20
25
30
CTR21