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參數(shù)資料
| 型號(hào)： | 73M2901CE-IGV/F |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 9/27頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MODEM 3.3V V.22BIS 32-TQFP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 數(shù)據(jù)格式： | V.21，V.22，V.23，Bell 103，Bell 212A |
| 波特率： | 300 ~ 9.6k |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-TQFP |
| 供應(yīng)商設(shè)備封裝： | 32-TQFP |
| 包裝： | 管件 |
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DS_2901CE_031
73M2901CE Data Sheet
Rev. 3.4
17
These commands are broken out as follows:
F
Set to factor defaults
S99=1
Set to U.S configuration (default)
Y0
Used clear channel mode (no speed buffering)
Y6
Use DTE/DCE speed buffering
K3
Use RTS/CTS flow control
C1
Use qualified carrier detection
C2
Use raw carrier detection
R2
Disconnect on
DTR toggle
S30=n
Set S30 to a modulation mode
Bn
Set to modulation mode
O2
Respond to retrain requests
S26+4
Enable auto retrain requests
S70=12
Lower retrain request threshold to 12
@L1
Leased line mode
Once the initialization string is given, the modems are started by sending ATD to one modem and ATA to
the other. The modems will then begin sending carriers and look for carrier from the other modem. When
the modems disconnect using R2 and
DTR, an “OK” result code is sent on RXD. The modem will stop
sending carrier at the end of the OK message, the delay time determined by the DTE speed and the time
it takes to output the message.
It is important to note the auto retrain feature (O2) should be enabled when using V.22bis. V.22bis
requires training when it connects and auto retrain is off by default. Make sure “S26+4” is also sent so it
can also initiate a retrain as well.
6.4.3
73M2901CE Energy Ring Detection
The 73M2901CE has a feature that was added with the intention of lowering the total modem cost by
eliminating some of the more expensive external components. The threshold for the ring detector
depends on the setting of the S123 register and the components in the Caller ID path, especially the
transformer. The number that S123 is set to represents the amplitude threshold of the ring signal (see
Table 2). In a conventional ring detect circuit the threshold is set by the hardware, usually the values of
the Zener diodes used in the ring detect circuit.
Table 3: Approximate Thresholds for Energy Ring Detection
Typical US Wet Transformer
S123 Register Setting with Frequency Checking
20
15
10
5
3
Vrms min off to on
45
34
24
12
7
Vrms min on to off
42
32
22
10
5
Typical ETSI TS 203 Dry Transformer Design
S123 Register Setting with Frequency Checking
20
15
10
5
3
Vrms min off to on
5
Vrms min on to off
5
Having the ability to set the threshold over a wide range through the S123 register eliminates the need to
change components to adjust the ring detection sensitivity. Energy ring detection uses the Caller ID path
and coupling transformer to path to pass the incoming ring signal to the modem so it can detect the ring
signal using the internal DSP. In an average design this can save at least $0.35 in the total parts cost or
even more in lower volume products. The 73M2901CE is still compatible with the earlier 2901 products
and still supports the opto-coupled ring detection method, although not on our current demo boards. Wet
transformers generally have poorer frequency response in the ring frequency range than dry
transformers. This means that the threshold must be sent to a lower number for wet transformers than
with some V.90-rated dry transformers. This also means that lower frequency ring signal detection will
also require a lower setting. The range of values for S123 can be from 1 to 127 when checking frequency
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| 73M2901CE-IGVR/F | 功能描述:電信線路管理 IC V.22bis Single-Chip Modem 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(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M2901CE-IM/F | 功能描述:電信線路管理 IC V.22bis Single-Chip Modem 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(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M2901CE-IM/F1 | 功能描述:電信線路管理 IC 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(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M2901CE-IMR/F | 功能描述:電信線路管理 IC V.22bis Single-Chip Modem 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(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M2901CE-IMR/F1 | 功能描述:電信線路管理 IC 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(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
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