Instruction Manual

HD132x Series User Manual

3.2.1 Power Supply

l Voltage Supply = 5V DC ±10%

l Current Supply = 150mA min.

3.2.2 External Interface

There is a total of 20 pins in the connector JP1 and JP2 in HD1321 to interface microprocessor,

Ethernet controller and UART with the user device. (See Table 3.1 and Figure 3.7)

Connector Pin # Symbols Descriptions Remarks

1 GND

Power Supply Grounding

2 Reset

System Reset Low Active

3 ~ 5 LED2 ~ LED0

Ethernet Communication Status LED

LED0: Tx, LED1: Rx, LED2: Collision

6 TPOut-

Ethernet Signal TPOut-

7 TPOut+

Ethernet Signal TPOut+

8 TPIn+

Ethernet Signal TPIn+

9 TPIn-

Ethernet Signal TPIn-

JP1

10 Vcc

5V Power Supply

1 Vcc

5V Power Supply

2 NC

3 DSR

RS232 Data Set Ready

4 CTS

RS232 Clear To Send

5 DTR

RS232 Data Terminal Ready

6 RTS

RS232 Ready To Send

7 RxD

RS232 Data Input

8 TxD

RS232 Data Output

9 NC

TTL Level

JP2

10 GND

Grounding

Table 3.1 HD1321 Pin Assignment