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| 型號： | SI2400URT-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 14/94頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR SI2400 ISOMODEM |
| 標準包裝： | 1 |
| 系列： | ISOmodem® |
| 主要目的： | 電信，調制解調器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | SI2400 |
| 主要屬性： | 雙路 RJ-11 連接至電話線路，音頻連接器 |
| 次要屬性： | RS-232，TTL 串行和 USB 接口 |
| 已供物品： | 板，調制解調器，電源 |
| 相關產(chǎn)品： | SI2400-BS-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC SI2400-FS-ND - IC ISOMODEM SYST-SIDE DAA 16SOIC 336-1093-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC |
| 其它名稱： | 336-1166 |
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Si2400
Rev. 1.3
21
result codes are suppressed, and the ALERT pin is the
only method of reporting an intrusion to the host.
The “i” and “I” result codes may be sent to the host
under the following conditions:
1. If the modem is in the process of establishing a connection
using the “ATDT#<cr>” or “ATA<cr>” commands and prior
to the “c”, “v”, or “d” result codes.
2. If the modem is in command mode and a call is initiated
using “ATDT#;” command.
3. If the modem is used in the security modes (ATDT#!0-!7)
(except !2).
4. If the modem is used in the !2 security mode while the
modem is not actively receiving/sending FSK data.
Once the ALERT pin is asserted as a consequence of
an intrusion, it is the responsibility of the host software
to negate it by clearing SE3[3] (GPD4) directly.
S14[1] (IND) is an indication of the current intrusion
status. It is updated whenever the “i” and “I” result
codes are sent to the host or when the ALERT pin is
asserted. If set, IND indicates that an intrusion event is
in progress. In addition, the status of IND persists for
800 msec after an off hook to on-hook event. After
800 msec has elapsed, IND functions as documented
for
the
on-hook
intrusion
algorithm.
This
delay
preserves the S14 register contents at the time the
ALERT is asserted.
When using the modem as a standard data modem and
the ALERT pin asserts, the host software may need to
force the modem back into command mode. In the
command mode, the host can determine if the ALERT
assertion was caused by an intrusion or a carrier loss by
querying the S14 register.
If the modem is dialing (after the ATDT string but before
the “c”, “v”, or “d” result codes), sending any character
places the modem back into command mode. In the
case in which the modem has already connected (in
data mode after the “c”, “v” or “d” result code has been
sent), an escape sequence is required to place the
modem in the command mode.
The best method of regaining control, without having to
know the exact status of the modem, is by issuing an
escape sequence (asserting the ESC pin and waiting a
short period of time) and sending a carriage return
character. The escape sequence takes care of the case
in which the modem is in the connected state, and the
carriage return character aborts the dialing if the modem
is in the process of dialing to get a connection. If the
modem is already on-hook and in command mode, the
carriage return character and escape sequence are
benign events.
5.6. Loop Current Detection
In addition to monitoring parallel phone intrusion, it is
possible to monitor the loss of loop current. This feature
can be enabled by setting SE82[3] (LCLD) = 1. This
feature is disabled by default. If the loop current is too
low for normal DAA operation, the “l(fā)” result code is sent,
and S14[2] (NLD) is set. Once the loop current returns
to a normal current state, the “L” result code is sent and
S14[2] (NLD) is cleared. The ALERT pin is also
asserted if enabled. The “L” and “l(fā)” result codes are not
always sent. The principles governing the reporting of
the “i” and “I” result codes apply to the “L” and “l(fā)” result
codes. The status of the S14 register is unchanged for
800 msec after an off-hook to on-hook event. This delay
preserves the S14 register contents at the time the
ALERT is asserted.
5.7. Carrier Detect/Loss
The Si2400 can provide the functionality of a loss-of-
carrier pin similar to the CD pin functionality in an RS-
232 connection. If programmed as an ALERT, GPIO4
will go high in data mode when either parallel phone
intrusion or a loss-of-carrier is detected. When used in
this manner, the host detects a low-to-high transition on
GPIO4 (ALERT), escapes into command mode, and
reads S14[1] (IND). If high, IND indicates intrusion. If
low, IND indicates loss-of-carrier.
A carrier detect function may also be implemented by
setting
SE2[3:2] (GPIO2) = 01b,
SE4[0] (TRSP) =0b,
and SOC[7] (CDE) = 1b.
If the Si2400 does not reliably detect loss of carrier, use
the following AT command string:
ATSE8=00SE6=00SE5=25SE8=01SE6=0ASE5=3DSE8=00
This moves the carrier-off level to within 0.5 dB of the
carrier-on level. (The default is 2.5 dB.) This reduces
the likelihood that the Si2400 will detect its own output
as a remote modem carrier.
5.8. Overcurrent Detection
The Si2400 will always go off hook with the current-
limiting mode enabled. This allows no possibility of
damage for voltages up to about 48 V. However, at
higher voltages the 43 V Zener protection device will
begin to conduct and could be damaged if the power is
applied for too long.
The Si2400 will detect the value of the loop current at a
programmable time set by S32 (OCDT) after going off-
hook (default = 20 ms). If the loop current is too high, an
“x” will be echoed back to the host to indicate a fault
condition. The host may then check S14[3] (OD) to
confirm an overcurrent condition.
The user can optionally put the Si2400 into a lower drive
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相關代理商/技術參數(shù) |
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|---|---|
| SI2401 | 制造商:SILABS 制造商全稱:SILABS 功能描述:V.22BIS ISOMODEM㈢ WITH LOW-COST DAA |
| SI2401-C-FS | 制造商:Silicon Laboratories Inc 功能描述: |
| SI2401DC-EVB | 功能描述:子卡和OEM板 SI2401 Daughter Card RoHS:否 制造商:BeagleBoard by CircuitCo 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| SI2401-FS | 功能描述:電信線路管理 IC 2400b/s System Side 3rd Gen DAA Tech RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| Si2401FS08-EVB | 功能描述:網(wǎng)絡開發(fā)工具 Si2401+Si3008 ISO modem Eval Board RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
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