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參數(shù)資料
| 型號： | ST7538 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | POWER LINE FSK TRANSCEIVER |
| 中文描述： | 電力線FSK收發(fā)器 |
| 文件頁數(shù)： | 16/30頁 |
| 文件大小： | 264K |
| 代理商： | ST7538 |
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ST7538
16/30
I
Carrier/Preamble Detection
The Carrier/Preamble Block is a digital Frequency detector Circuit.
It can be used to manage the MAINS access and to detect an incoming signal.
Two are the possible setting:
- Carrier Detection
- Preamble Detection
CARRIER DETECTION: The Carrier/Preamble detection Block notifies to the host controller the
presence of a Carrier when it detects on the RAI Input a signal with an harmonic component close to
the programmed Carrier Frequency. The CD_PD signal sensitivity is identical to the data reception
sensitivity (1mVrms Typ. in Normal Sensitivity Mode).
The CD_PD line is forced to a logic level low when a Carrier is detected.
PREAMBLE DETECTION: The Carrier/Preamble detection Block notifies to the host controller the
presence of a Carrier modulated at the Programmed Baud Rate for at least 4 Consecutive Symbols
(“1010” or “0101” are the symbols sequences detected).
CD_PD line is forced low till a Carrier signal is detected and PLL is in the lock-in range.
To reinforce the effectiveness of the information given by CD_PD Block, a digital filtering is applied on
Carrier or Preamble notification signal (See Control Register Paragraph). The Detection Time Bits in the
Control Register define the filter performance. Increasing the Detection Time reduced the false
notifications caused by noise on main line. The Digital filter adds a delay to CD_PD notification equal to
the programmed Detection Time. When the carrier frequency disappears, CD_PD line is held low for a
period equal to the detection time and then forced high.
Figure 10. CD_PD Timing during RX
Figure 11. Receiving Path Block Diagram
T
DCD
T
CD
CD_PD
RAI
D03IN1418
Low Pass
Band Pass
PRE-FILTER
IF FILTER
FSK
DEMODULAOR
DIGITAL
FILTER
MIXER
CARRIER/
PREAMBLE
DETECTION
AGC
GAIN
CONTROL
LOCAL
OSC
32
31
Bit 23
Bit 0 -2
Bit 3,4 &14-21
Bit 0-2
RAI
RXFO
Bit 9 & 10
Bit 12 & 13
Carrier Detection
3
RxD
8
CLR/T
1
CD_PD
9
BU
PLL
Bit 3,4
Low Pass
BAND
IN
USE
Bit 3,4
Band Pass
CHANNEL
FILTER
Band Pass
D03IN1419
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST7538P | 功能描述:電信線路管理 IC 1/2 Duplex FSK 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 |
| ST7538P013TR | 功能描述:電信集成電路 1/2 Duplex FSK Modem RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
| ST7538Q | 功能描述:電信線路管理 IC FSK power line transceiver 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 |
| ST7538QTR | 功能描述:電信線路管理 IC FSK power line transceiver 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 |
| ST7540 | 功能描述:電信線路管理 IC FSK powerline transceiver 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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