UM0240 datasheet(19/39 Pages) STMICROELECTRONICS

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UM0240

Interfaces and connectors

19/39

The two PLC interface control signals are connected in the PLM board either to the GND or

to VDD and are used to detect which modem is mounted on the board. There are four

possible configurations but only two are, at present, in use:

●

00 (GND,GND) for the ST7538

●

10 (GND,VDD) for the ST7540

6.5

In-circuit communication

The In Circuit Communication connector provides access to several debug features and to

the In Circuit Programming function that enables complete writing to the MCU Flash

memory.

6.6

Power supply

As described in Section 2: Power supply, the ST Industrial Communication Board can take

is power supply from different sources. If an external dedicated power supply is selected, it

must be in the 5V ÷ 35V range.

Taking into account that the board has a power consumption in steady state of

approximately 50mW, a value of 500mW is suggested.

The external power supply connector is a standard 2.5-mm phone jack that is compatible

with common PC notebook power supply connectors.

6.7

Jumpers

Five jumpers are present on the board to give flexibility on the use of reset management,

DAC reference voltage; In Circuit Communication and RS232 interface power supply.

Table 5.

PLC interface control signals

Pin number

Signal name

Description

Generated by

B_ID_PLM_1

Board ID for PLM Applications (MSB)

Modem

B_ID_PLM_0

Board ID for PLM Applications (LSB)

Modem

Table 6.

Power connections

Pin number

Signal name

Description

Generated by

PLM_10V

10V power supply

Modem

VDD

3.3V/5V power supply

Modem

VDDF

Digital power supply

Modem

22,34

GND

Ground

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