PLC Transceiver MI200E
Application Note V1.4
Copyright © Miartech, Inc Page 1 of 26
MI200E
应 用 笔 记
PLC Transceiver MI200E
Application Note V1.4
Copyright © Miartech, Inc Page 2 of 26
Revision History
Version # Author
A. Description Of Change
B. Summary of Review
Issued By/Date
1.1 Pengsi.Xu Initial Draft 2007-3-15
1.2 Pengsi.Xu Transmit Circuit / Oscillator Frequency change 2008-3-19
1.3 Pengsi.Xu MI200E PCB layout 2008-11-14
1.4 Pengsi.Xu 2009-6-26
PLC Transceiver MI200E
Application Note V1.4
Copyright © Miartech, Inc Page 3 of 26
目录
1 概述...........................................................................................................................................4
2 性能参数...................................................................................................................................5
3 硬件设计...................................................................................................................................6
3.1 典型应用原理图 ...................................................................................................... 6
3.2 电源电路 .................................................................................................................. 8
3.3 电力线耦合电路 ...................................................................................................... 9
3.4 发送滤波器 ............................................................................................................ 10
3.5 接收滤波器 .............................................................................................................11
3.6 SPI 接口 ................................................................................................................. 13
3.7 复位电路 ................................................................................................................ 13
3.8 晶振电路 ................................................................................................................ 14
3.9 过零检测 ................................................................................................................ 14
3.10 发送/接收波形 ....................................................................................................... 14
3.11 PCB 设计............................................................................................................. 16
4 软件设计.................................................................................................................................20
4.1 寄存器设置 ............................................................................................................ 20
4.2 主程序设计 ............................................................................................................ 21
4.3 初始化设置 ............................................................................................................ 22
4.4 发送程序 ................................................................................................................ 23
4.5 接收程序 ................................................................................................................ 25
4.6 其他 ........................................................................................................................ 26
PLC Transceiver MI200E
Application Note V1.4
Copyright © Miartech, Inc Page 4 of 26
1 概述
MI200E 是一款针对低压电力线环境优化设计的高性能通讯芯片。内部集成了诸如多阶
开关电容滤波器,高效数字放大器, CRC-16 硬件校验等多种电路。由于 MI200E 是一款数
模混合芯片,因此在进行软硬件设计时都必须遵循一定的准则。
在进行外围电路设计时,在电源电路,耦合电路与信号滤波电路的参数设定与器件选择,
PCB 设计上都必须仔细考虑。而在进行软件开发时,如何正确设置 MI200E 的寄存器,才能
让通讯可靠,也是需加以注意的。
为了缩短用户的产品开发周期,同时更好地发挥 MI200E 优秀的通讯性能,本文将从硬
件设计与软件设计两方面入手,详细说明如何来设计一个典型的基于 MI200E 的通讯方案。
PLC Transceiver MI200E
Application Note V1.4
Copyright © Miartech, Inc Page 5 of 26
2 性能参数
MI200E 的性能参数见表 1,并请参考 MI200E 的数据手册。
(AV
DD
=DV
DD
=+5V, PGND=AGND=DGND=0V, -40℃≤Temp≤+85℃, unless otherwise specified )
Symbol Parameter Test Conditions/Comments Min. Typ. Max. Unit
AV
DD
,DV
DD
Supply Voltages 4.5 5.0 5.5 V
AI
DD
Analog Supply
Current
Transmission & Receiving
Mode
4.0 4.5 5.0 mA
Receiving Mode 4.0 5.0 6.0 mA
Transmission Mode(No Load) 25 30 35 mA
DI
DD
Digital Supply
Current
Digital I/O
V
IH
High Logic level
Input Voltage
2.0 V
V
IL
Low Logic level Input
Voltage
0.8 V
V
OH
High Logic level
Output Voltage
I
OH
= 2mA 4.5 V
V
OL
Low Logic level
Output Voltage
I
OL
= 2mA 0.4 V
Oscillator
V
IHX
XTAL1 High Level
Input Voltage
External Clock 3.0 V
V
ILX
XTAL1 Low Level
Input Voltage
External Clock 2.0 V
DC
XTAL Clock Duty
Cycle
External Clock 20 80 %
Xtal
Crystal Oscillator
Frequency
12 MHz
T
CLOCK
Oscillator Period (1 /
Xtal)
83.33 ns
Xtal
ESR
External Oscillator
Esr Resistance
100 Ohm
Xtal
CL
External Oscillator
Stabilization
Capacitor
22 33 pF
Receiver
Input Sensitivity
( Normal Mode )
2 4 mV
RMS
V
IN
Input Sensitivity
( High Sens. )
500 μV
RMS
V
IN
Maximum Input
Signal
1.8 2 V
RMS
R
IN
Input Impedance 60 80 100 KΩ
表 1:MI200E 性能参数表