AN2511 datasheet(30/43 Pages) STMICROELECTRONICS

30 / 43 page

Using the demonstration board

AN2511

30/43

Doc ID 13286 Rev 2

Using the demonstration board

After installing the setup as explained in Section 1, the following message appears in

hyperterminal.

Figure 9.

Hyperterminal message to show company name and selection of

communication speed

If there is any problem in getting the message, press the switch provided in the

demonstration board. This switch re-starts the application.

6.1

Normal operation

The following sections explain how to initiate PMBus communication and how to read/ write

PMBus commands with hyperterminal.

6.1.1

Selection of communication speed

After the message appears as shown in Figure 9, the user should enter 1 or 2 to select the

PMBus communication speed as 100 kHz or 400 kHz respectively. The default speed value

selected is 100 kHz.

If the user enters any other value other than 1 and 2, the previous speed value is retained.

6.1.2

Selection of packet error checking

After the message appears as shown in Figure 10, the user should enter 1 or 2 to enable

PEC and disable PEC respectively. If PEC is enabled, all address, command code and data

communications are checked through CRC-8 check. The default PEC value is PEC

disabled.

If the user enters any other value other than 1 and 2, the previous speed value is retained.

Figure 10.

PEC selection

6.1.3

Selection of slave address

The user should enter the slave address of the PMBus device. The slave address should be

in hexadecimal format. The slave addresses of different competitor’s module are given

below. Artesyn DPL20C module: 0x30 SiLabs Si8250-TB module : 0x80.

The slave address could change from one device to another device. The user must refer to

the product datasheet and development kit documents to decide on the slave address. An

example entry of slave address with Artesyn DPL20C module is shown below.

AN2511 Datasheet(PDF) 30 Page - STMicroelectronics