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17
VCC18O
OUT
52
1.8V output of interior regulator. No use the internal
regulator, use the external 1.8V supply, connect the pin
to external VCC18.
GND
GND
17,34,40,43,4
9,50,63,78
Ground
nRST
IN
74
When nRST is in low electrical level, reset chip. The low
level keeping time must over 5ms. Recommended to use
the special reset chip, and do not use the resistance
capacitance reset circuit.
XTL-, XTL+ IN
38,39
25M
oscillator, noted that it’s need to connect 1M Ohms
resistance.
Ethernet Pin
RX+,RX-
IN
44,45
Ethernet receiving
TX+,TX-
IN
47,48
Ethernet sending
Ordinary Serial port Pin
RXD,TXD
IN/OUT 65,67
3.3V TTL level, serial port input/output pin, can directly
connect with MCU port. Note that RXD connect user
MCU TXD, TXD connect user MCU RXD.
CTS, CTS2 IN
16
Hardware flow control input, when chip configured as
CTS/RTS, DSR/DTR mode, only CTS=0 the chip port
will output data. If need hardware flow control support
please connect CTS and RTS together, or else no need
connect these two pins.
RTS
OUT
62
Hardware flow control output. Flow control set as
CTS/RTS, DTR/DSR, normally RTS=0, when RTS=1
means ZLAN1003 cannot receive data, user MCU
should stop to send data to ZLAN1003. The reason
ZLAN1003 cannot receive data including: chip in
initialization, TCP connection no built, the receiving
buffer of ZLAN1003 port is full.
High-speed Serial port Pin
CONFIG
IN
33
High speed serial port enable pin, if pull-up through 10K,
do not use high-speed serial port; Otherwise, pull-down
through 10K to open UART2 high-speed serial port.