SI2493-D-FS Silicon Laboratories Inc, SI2493-D-FS Datasheet - Page 110

• Manufacturer Part Number: SI2493-D-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-D-FS

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AN93
U68 is a bit-mapped register with bits 15:3 reserved. Reading these bits returns zero. Bits 4 and 2:0 are all read/
write (see Table 68).
Bit 2 (BTE) = 0 (default) is disabled by default. When BTE = 1, the DAA automatically responds to a collapse of the
line-derived power supply during a billing tone event. When off-hook, if BTE = 1 and BTD goes high, the dc
termination is increased to 800  to reduce loop current. If BTE and U70 [9] (RIM) are set to 1, an interrupt from
U70 [1] (RI) also occurs when BTD goes to 1 (high).
Bit 1 (ROV) is normally 0 and is set to 1 to report an excessive receive input level. ROV is cleared by writing it to 0.
Bit 0 (BTD) = 0 normally but is set to 1 if a billing tone is detected. BTD is cleared by writing a 0 to BTD.
U68 resets to 0x0000 with a power-on or manual reset.
U6A is a bit-mapped register with bits 15:3 and 1:0 reserved. Reading these bits returns zero. Bit 2 is read-only
(See Table 69).
Bit 2 (OVL) is a read-only bit that detects a receive overload. This bit is similar to U68 [1] (ROV) except OVL clears
itself after the overload condition is removed.
110
15:8
7:3
Bit
Bit
2
1
0
0
Reserved Read returns zero.
Reserved Do not modify.
Name
Name
ROV
BTD
BTE
RT
Ringer Threshold Select.
Used to satisfy country requirements on ring detection. Signals below the lower level do not
generate a ring detection; signals above the upper level are guaranteed to generate a ring
detection.
0 = 11 to 22 V
1 = 17 to 33 V
Function
Billing Tone Protect Enable.
0
1
Receive Overload.
0
1
Billing Tone Detected.
0
1
=
=
=
=
=
=
Disabled.
Enabled.
Normal receive input level.
Excessive receive input level.
No billing tone.
Billing tone detected (cleared by writing 0).
rms
rms
.
.
Table 67. U67 Bit Map* (Continued)
Table 68. U68 Bit Map*
Rev. 1.3
Function