Concentrator side hardware schematic design

Here is an introduction to the hardware schematic design of the concentrator side:

The TI concentrator design is based on the system description in Chapter 1 and adopts the hardware architecture of ARM9+C2000+ AFE031 .

The hardware design is divided into two boards, where the carrier board is composed of a three-phase coupling circuit + AFE031 + C2000, and the concentrator board is composed of TI's ARM9 (AM180x) and external RAM and Flash. The concentrator board and carrier board are stacked together through two 10-pin connectors.

1: Description of the weak current interface between the PLC module and the concentrator:

According to Q/GDW 375.2-2009, the local interface module at the concentrator end is defined as follows:

Figure 1: Definition of the weak current interface of the local communication module of the concentrator (top view)

The pin definitions of the weak current interface of the local interface module at the concentrator end are as follows:

Table 1 Definition of the weak current interface pins of the concentrator local communication module

According to the above weak current interface definition, the corresponding interface of the carrier board of the PLC carrier module is as follows:

Figure 2: PLC module carrier interface definition

2: Description of the three-phase coupling circuit of the carrier board :

The three-phase coupling circuit of the carrier board is shown in the figure below:

Figure 3: Three-phase coupling circuit of PLC module carrier

Two coupling transformers T1 and T2 are connected in the figure and can be switched according to different cost requirements and performance requirements.

3. AFE031 and C2000 hardware connection

The AFE031 circuit and the C2000 circuit are connected in the same way as the meter end.

4: Communication interface between carrier board and ARM9 board

As mentioned at the beginning, the ARM9 concentrator board is superimposed on the C2000 carrier board, and the direct interface between the two is defined as follows:

Figure 4: Communication interface between boards

The 5V power supply required by the concentrator board is provided by the C2000 carrier board. C2000 and ARM9 communicate through the serial port, and the serial port signals are TX_F_C2000 and RX_F_C2000.

If the user already has a non-TI ARM9 concentrator solution, then according to the description in Chapter 1, the two ARM9s need to communicate through the serial port. On the C2000 carrier board, TX_A and RX_A (5V TTL level) have been converted to 3.3V level supported by TI AMR9 through the TXB0102 chip, and the signals are TX_3V3 and RX_3V3 respectively.

Five: Ethernet interface

According to the requirements of the concentrator carrier module mold, the Ethernet port needs to be placed on the C2000 board. In order to adapt to the customer's two different design schemes, the Ethernet schematic is designed as follows:

Figure 5: Ethernet circuit

For this circuit, customers can select whether the Ethernet output source is TI's ARM9 or non-TI's ARM9 through jumpers S1~S4.