USR IOT USR-TCP232-S2 User manual

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USR-TCP232-S2 Hardware Manual
File version:V1.0.1

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USR-TCP232-S2 Hardware Manual......................................................................................................................... 1
1. Overview.................................................................................................................................................................... 3
1.1. Brief Introduction........................................................................................................................................... 3
1.2. Pin instruction................................................................................................................................................ 3
1.3. Pin Dimension............................................................................................................................................... 5
USR-TCP232-S2 : 33.0*20.3*2.0mm ( L*W*H, 2.0mm is the maximum height )...................................5
1.4. Evaluation Kit.................................................................................................................................................5
Diagram 4 Evaluation Kit.................................................................................................................................. 6
2. Hardware Reference Design.................................................................................................................................. 7
2.1. Typical Application Connection...................................................................................................................7
2.2. Power Interface............................................................................................................................................. 7
2.3. UART Interface..............................................................................................................................................7
2.4. 10/100M LAN interface................................................................................................................................ 8
2.4.1. External voltage changer of LAN interface................................................................................... 8
2.4.2. Internal voltage changer of LAN interface.....................................................................................9
2.4.3. Reference package........................................................................................................................... 9
3. Contact information.................................................................................................................................................. 9
4. Disclaimer................................................................................................................................................................10
5. Undated History......................................................................................................................................................10

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1. Overview
1.1. Brief Introduction
TCP232-S2 is a new and tiny size serial to Ethernet module which realizes data bidirectional transparent
transmission between TTL Port and RJ45 Port, it can also used in RS232/ RS485 by level shift circuit.
S2 is equipped with Cortex-M0 core. It has characters of low power, fast speed, high efficiency, strong
compatibility, it is easy to use.
1.2. Pin instruction
Diagram 1 USR-TCP232-S2 interface
Table 1 USR-TCP232-S2 Pin instruction
Number
Pin
Function
Instruction
1
GND
Ground signal
Connect to ground
2
RST
Reset
Pin receive current below 200ms ,it can reset module.
If unneeded, don’t connect the pin .
(Power on , reset means restart the module. Advice connect
I/O of MCU, MCU can control the module .)
3
ISP
NC
Don’t connect the pin
4
RXD
Receive data
TTL connect to 3.3v MUC
(For 5V, refer to Diagram 2)

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5
TXD
Send data
TTL connect to 3.3v MCU
(For 5V, refer to Diagram 2)
6
CFG(Reloa
d)
For module
configuration
and restore
factory default
When normal working , don’t connect the pin or connect to
high level. Under low level, the pin is used for module
Configuration. When configuration, pull down Reload pin,
enter into port Configuration. If choose “Reload” in webpage
or setting software, it is used to restore factory default
7
LD2
Network data
indication
Network data indication light, connect VCC by LED, don’t
need to connect current-limiting resistance.
8
LD1
Network
connection
indication
Network connection indication light, connect VCC by LED,
don’t need to connect current-limiting resistance.
9
AVDD
PHY output
voltage
PHY control voltage output, connect network transformer
center tap.
10
RX+
Receive
signal +
Receive Data+ ,shorten the line if connect
11
RX-
Receive
signal +
Receive Data- ,shorten the line if connect
12
TX+
Send signal+
Transceiver Data+ ,shorten the line if connect
13
TX-
Send signal-
Transceiver Data- ,shorten the line if connect
14
RS_485
Reserved
RS485 reserved pin
15
Link
Reserved
Used as indication pin for TCP connection status.
16
VCC
Power supply
Typical value 3.3V @ 200mA
Diagram 2 3.3V to 5V voltage conversion circuit

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1.3. Pin Dimension
USR-TCP232-S2 : 33.0*20.3*2.0mm ( L*W*H, 2.0mm is the maximum height )
Diagram 3 S2 Dimension
1.4. Evaluation Kit
USR-TCP232-EVK evaluation board can be used for TCP232-S2, 100*76mm( L*W )

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Diagram 4 Evaluation Kit

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2. Hardware Reference Design
2.1. Typical Application Connection
Diagram 5 Typical Application Connection
Note:
1) RST: Restart button. It works at low level, 3.3V, 10K pull-up resistor inside. When it access to power or
breakdown, pull down 300ms then high level.
2) Link: connection indication.Can be used as indication pin for net connection, when connected, it outputs
low level; When unconnected, it output high level.
3) CFG(Reload): connect to external button or configuration pin. 3.3V, 10K pull-up resistor inside. Press
it and pull to low level, then release hands after 3 seconds, module restores factory default and restart.
4) UART_TXD/RXD: data rend/ receive signal(10K pull-up resistor inside)
5) S2 need to connect network voltage changer ,RJ45 Port .
2.2. Power Interface
USR-TCP232-S2 : typical value DC 3.3V, 3V~3.6 V . Working current is 150mA, max current is 200mA
2.3. UART Interface
UART is Serial data interface , only support TTL-3.3V. UART can connect RS232 chip ,then convert into

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RS232 Level. UART has TXD/RXD signal wire. Take RS232 Level for example:
Diagram 6 UART Interface Design
If communicated with MCU (3.3V TTL), connect module’s TXD to MCU’S RXD, modules’ RXD to MCU’S
TXD. If MCU 5V TTL, need voltage conversion circuit, as follows:
Diagram 7 UART Level Switch Design
2.4. 10/100M LAN interface
2.4.1. External voltage changer of LAN interface
USR-TCP232-S2 can connect 10/100M LAN interface, supports RJ45 connector and network voltage
changer interconnection. network voltage changer and RJ45 connector combined into a typical 10/100M
LAN Port, then connects to USR-TCP232-S2 . RX+ and RX-Differential Pairs, TX+ and TX-Differential Pairs.
AVDD connects S2 9th Pin, it is output interface of PHY chip voltage. reference circuit as follows:

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Diagram 8 RJ45 interface external voltage changer circuit
2.4.2. Internal voltage changer of LAN interface
RJ45 has 2KV Electromagnetic isolation network voltage changer . It is AC coupled connection.
RX+ and RX-Differential Pairs, TX+ and TX-Differential Pairs. AVDD is S2 9th Pin, output interface of
PHY chip voltage.
Diagram 9 RJ45 interface internal voltage changer circuit
2.4.3. Reference package
For principle package library and PCB package library, please download from http://www.usriot.com/
3. Contact information
Company: Jinan USR IOT Technology Limited.
Address: Floor 11,Building1,No.1166 Xinluo Street, Gaoxin Distric, Jinan, Shandong, 250101 China.
Tel: [phone]
Web: http://www.usriot.com/

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Support:http://h.usriot.com/
Email: [e-mail]
4. Disclaimer
The document provides information about USR-TCP232-S2 module, it doesn’t grant any license to the
intellectual property rights. Except the responsibility declared in the product sale clause, USR does not assure
any other responsibilities. In addition, USR does not make any warranties for the sale and use of this product,
including the suitability of products for a particular purpose, merchant ability or fitness for any patent, copyright
or other intellectual property infringement.USR may make changes to specifications and products description
without notice.
5. Undated History
V 1.0.12016-7-8 First Version