SI2457FS18-EVB Silicon Laboratories Inc, SI2457FS18-EVB Datasheet - Page 58

• Manufacturer Part Number: SI2457FS18-EVB
• Description: BOARD EVAL SI2457 + SI3018 16PIN
• Manufacturer: Silicon Laboratories Inc
• Series: ISOmodem®r

Specifications of SI2457FS18-EVB

• Main Purpose: Telecom, Data Acquisition Arrangement (DAA)
• Utilized Ic / Part: Si2457
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Si2457/34/15/04-Si3008
U79 GEN4
Reset settings = 0x00XX
58
Name
15:5
Type
Bit
4:0
Bit
LVCS[4:0] Line Voltage Current Sense.
Reserved Read returns zero.
D15
Name
D14
Represents either the line voltage, loop current, or on-hook line monitor.
On-Hook Voltage Monitor (2.75 V/bit ±20%).
00000 = No line connected.
00001 = Minimum line voltage (V
11111 = Maximum line voltage (87 V ± 20%).
The line voltage monitor full scale may be modified by changing R5 as follows:
V
Off-Hook Loop Current Monitor (3 mA/bit).
00000 = No loop current.
00001 = Minimum loop current.
11110 = Maximum loop current.
11111 = Loop current is excessive (overload).
LVCS is backward compatible with Si2456/33/14 ISOmodems. The LVCS value is absolute
and does not reflect loop polarity. See U6C (LVS)[15:8] for 1 V/bit resolution and signed twos
complement output
D13
MAX
= V
D12
Overload > 140 mA in all modes except TBR21
Overload > 54 mA in TBR21 mode
MIN
+ 4.2 (10M + R5 + 1.6k)/(R5 +1.6k)/5
D11
D10
Preliminary Rev. 0.7
D9
MIN
D8
= 3.0 V ± 0.5 V).
Function
D7
D6
D5
D4
D3
LVCS[4:0]
D2
R
D1
D0