SI2457-C-FT Silicon Laboratories Inc, SI2457-C-FT Datasheet - Page 56

• Manufacturer Part Number: SI2457-C-FT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-C-FT

• Package / Case: 24-TSSOP
• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.32, V.34, V.90, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel, UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Operating Frequency: 4.92 MHz
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Supply Current: 26 mA
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Si2457/34/15/04-Si3008
U77 GEN2
Reset settings = 0x401E
56
15:12
Name
Type
Bit
8:0
10
Bit
11
9
Reserved Read returns zero.
OHT[8:0]
D15
IST[3:0]
Name
AOC
HOI
D14
IST[3:0]
R/W
Intrusion Settling Time (250 ms units).
Delay between when the ISOmodem goes off-hook and the off-hook intrusion algorithm
begins. Default is 1 s.
Hang-Up On Intrusion.
0 = ISOmodem will not automatically hang up when an off-hook PPD interrupt occurs.
1 = ISOmodem automatically hangs up on a PPD interrupt. If %Vn commands are set, HOI
also causes the “LINE IN USE” result code upon PPD interrupt.
Auto Overcurrent.
0 = Disable.
1 = Enable.
Note: AOC may falsely detect an overcurrent condition in the presence of line reversals or other
Off-Hook Time (1 ms units).
Time before LVCS is checked for overcurrent condition after going off-hook (30 ms default).
D13
transients. Therefore, this feature should not be used in applications or locations (such as
Japan) where line reversals are common or may be expected.
D12
R/W
D11
HOI
D10
Preliminary Rev. 0.7
AOC
R/W
D9
D8
Function
D7
D6
D5
OHT[8:0]
R/W
D4
D3
D2
D1
D0