UM0323 - User manual

Evaluation board hardware description

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Evaluation board hardware description

The evaluation board hardware layout was created in OrCAD 10.3 and all project files are included on the

installation CD-ROM in the Hardware directory.

Figure 24.

Evaluation board components layout

Connectors:

●

K1 - USB B connector for connection to the PC

●

P1 - CANON 9 pin male RS232 connector

●

J3 - Power connector, pin1 (square pad) = +5V, pin2 = GND

●

J4 - GPIO port D of ST72651. Can be used for connecting additional circuitry.

●

J5 - ICC programming connector. Used for programming ST72651 with new firmware or for

debugging.

●

J6 - TTL level of RS232 RX (circle pad) and TX (square pad) signals. Some applications need only

TTL signal levels for serial communication.

●

J7 - GPIO port B of ST72651. Can be used for connecting additional circuitry.

Junctions (all connected by default):

●

CB1 - Connect/Disconnect +10V to pin 4 of the RS232 connector (DTR signal). This connection can

be used to power the application connected with RS232

●

CB2 - Connect/Disconnect RX TTL signal from MCU to RS232 level shifter.

●

CB3 - Connect/Disconnect TX TTL signal from MCU to RS232 level shifter.

LEDs:

●

D1 - lights up when the board is connected to USB and enumerated

●

D2 - lights up during transfers from USB to RS232

●

D3 - lights up during transfers from RS232 to USB.

AI12635

PLUG

P1

1

6

9

5

C16 C14 C15 C17

CB1

CB3

CB2

C20

C19

U3

R8

R7

9

10

J5

1

2

C18

J3

J4

C8

Y1

J6

J7

49

33

117

U1

R9

C21

C10

C9

C11

R3

C13

R1

R5

D1

R4

D3

R6

D2

K1

Y2