Getting started

UM0250

4/12

1.4

Hardware installation

Figure 1 shows the location of the main components of the evaluation board. The schematic

drawing is given in Figure 6: Low-speed USB/RS232 Evaluation Board schematics on

page 10.

Figure 1.

Evaluation Board Layout

1.4.1

Power supply

The Low-speed USB/RS232 Evaluation Board is directly supplied by the USB Connector

(bus-powered) and therefore does not require an external voltage supply.

1.4.2

Data transfer via PC serial port

When connected to a PC serial port for data transfer purposes, a DTE (Data Terminal

Equipment) to DTE configuration is required. As a result, a cross-wired RS-232 cable must

be used as shown in Figure 2.

The Low-speed USB/RS232 Evaluation Board is equipped with two LEDs that display the

data transfer status:

●

Yellow/Orange LED: USB to Serial Bus transfer is active,

●

Green LED: Serial Bus to USB transfer is active.

ST3222E (on reverse side)

USB Connector & Supply

ST72F60Kx or ST72F63BDx

ICC Connector

RS-232 Connector

USB to Serial Port Transfer

Serial Port to USB Transfer

Active LED (Green)

Active LED (Yellow)