ST公司的ST7570是S-FSK動力線網絡系統級芯片(SoC),包括高性能PHY處理器核和協議控制器核,以及模擬前端(AFE)和線路驅動器,50Hz時的可編程比特率高達2.4kbps,1Hz步長的可編載波高達148.5 kHz,8-18V功率放大器電源,3.3V或5V數字I/O電源,是符合IEC61334-5-1 S-FSK標準的性價比最好的單片動力線通信解決方案.本文介紹了ST7570主要特性,方框圖以及電路圖,材料清單和PCB布局圖.
The ST7570 is a powerful power line networking system-on-chip. It combines a high-performance PHY processor core and a protocol controller core with a fully integrated analog front end (AFE) and line driver.
The ST7570 features allow the most costeffective, single-chip power line communication solution based on IEC61334-5-1 S-FSK standard. Realized using a multi-power technology with state-of-the-art VLSI CMOS lithography, the ST7570 is based on dual digital core architecture (a PHY processor engine and a protocol controller core) to guarantee outstanding communication performance with a high level of flexibility and programmability.
The on-chip analog front end, featuring analog to digital and digital to analog conversion and automatic gain control, plus the integrated power amplifier delivering up to 1Arms output current, makes the ST7570 the first complete system-on-chip for power line communication.
Line coupling network design is also simplified, leading to a very low cost BOM. Safe and performing operations are guaranteed while keeping power consumption and distortion levels very low, thus making ST7570 an ideal platform for the most stringent application requirements and regulatory standards compliance.
ST7570主要特性:
■ Fully integrated narrow-band power line networking system-on-chip
■ High performing PHY processor with embedded turn-key firmware for spread frequency shift keying (S-FSK) modulation:
– Programmable bit rate up to 2.4 Kbps (@ 50 Hz)
– 1 Hz step programmable carriers up to 148.5 kHz
– Signal to noise ratio estimation
– Received signal strength indication
■ Protocol engine embedding:
– IEC61334-5-1 PHY and MAC layers
– Alarm management
■ On chip peripherals:
– Host controller UART interface
■ Fully integrated analog front end:
– ADC and DAC
PGA with automatic gain control for high receiving sensitivity
– High linearity modulated signal generation
■ Fully integrated single-ended power amplifier for line driving
– Up to 1 A rms, 14 V p-p output
– Configurable Active filtering topology
Very high linearity
Embedded temperature sensor
– Current control feature
■ 8 to 18 V power amplifier supply
■ 3.3 V or 5 V digital I/O supply
■ Integrated 5 V and 1.8 V linear regulators for AFE and digital core supply
■ Mains zero crossing synchronization
■ Suitable for EN50065 and FCC part 15 compliant applications
■ VFQFPN48 package with exposed pad
■ -40 ℃ to +85 ℃ temperature range
圖1. ST7570方框圖
The ST7570 demonstration board has been realized as a useful tool which exploits the performance capability of the ST7570 S-FSK power line networking system-on-chip . With this demonstration board, it is possible to evaluate the ST7570 features and its transmitting and receiving performance directly on the power line.
The coupling interface is designed to allow the ST7570 device to transmit and receive on the mains using a spread-spectrum FSK signal with 63.3 and 74 kHz tone frequencies, within the European CENELEC EN50065-1 standard A-band, specified for automatic meter reading.
圖2. ST7570演示板外形圖
圖3. ST7570演示板各部分分割圖
圖4. ST7570演示板電路圖:ST7570電路圖(1)
圖5. ST7570演示板電路圖:電源部分
圖6. ST7570演示板電路圖:UART接口部分
圖7. ST7570演示板電路圖:外接MCU連接部分
圖8. ST7570演示板電路圖:ST7570電路
圖9. ST7570演示板電路圖:復位電路部分
圖10. ST7570演示板電路圖:JTAG線路
圖11. ST7570演示板電路圖:限流設定
圖12. ST7570演示板電路圖:非隔離的零交叉
圖13. ST7570演示板電路圖:USB和UART連接
圖14. ST7570演示板電路圖:接收和發送濾波電路
ST7570演示板材料清單:
圖15. ST7570演示板PCB元件布局圖
圖16. ST7570演示板PCB布局圖:頂層
圖17. ST7570演示板PCB布局圖:底層
詳情請見:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/CD00271738.pdf
和
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/USER_MANUAL/CD00286479.pdf
以及
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00274120.pdf、