USR IOT USR-WIFI232-D2 User manual

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USR-WIFI232-D2 Hardware Manual
File version: 1.0.12.01

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Content
USR-WIFI232-D2 Hardware Manual......................................................................................................................1
1. Product Overview......................................................................................................................................................3
1.1. Dimension........................................................................................................................................................ 3
1.2. Pin Definition.................................................................................................................................................. 3
2. Hardware Design.......................................................................................................................................................5
2.1. Typical Connection........................................................................................................................................5
2.2. Power Interface............................................................................................................................................. 5
2.3. UART Interface...............................................................................................................................................6
2.4. 10/100M Ethernet Interface.................................................................................................................... 6
2.5. Antenna.............................................................................................................................................................7
3. Contact.......................................................................................................................................................................... 8
4. Disclaimer.................................................................................................................................................................... 8
5. Update History........................................................................................................................................................... 8

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1.Product Overview
1.1. Dimension
Module dimension diagram as follow:
Figure 1 Dimension diagram
1.2. Pin Definition

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PIN
Name
Signal Type
Definition
1
TX1+
O
1.8V interface. Supporting direct connection with
external transformer or Ethernet AC Coupling without
external transformer. From 1~4 respectively are are
Ethernet 1 output+, output-, input+, input-.
2
TX1-
O
3
RX1+
I
4
RX1-
I
5
NET1_LED
O
LED for Ethernet 1. Low level means connection normal,
blinking means data transmission.
6
UART_TXD
O
If user don’t need UART function, these four pins can be
set to GPIO function mode. Then user can send AT
command to query/set GPIO status.
GPIO6
I/O
7
UART_RXD
I
GPIO7
I/O
8
UART_RTS
O
GPIO8
I/O
9
UART_CTS
I
GPIO9
I/O
10
RESET
I
Reset the module, take effect in low level. Press over
300ms and release to reset the module.
11
1.8V
O
1.8V@300mA, used for Ethernet.
12
GND
P
Power ground.
13/14
3.3V
P
3.3V@350mA, VCC.
15
GND
P
Power ground.
16
nLink
O
WIFI connected, output “0”; otherwise output “1”. Can be
set as GPIO.
GPIO16
I/O
17
nReady
O
Module starting normally, output “0”; otherwise output
“1”. Can be set as GPIO.
GPIO17
I/O
18
nReload
I
Take effect in low level. Press over 3 seconds and
release to restore default settings.
GPIO10
I/O
19
NET2_LED
O
LED for Ethernet 2. Low level means connection normal,
blinking means data transmission.
20
RX2-
I
1.8V interface. Supporting direct connection with
external transformer or Ethernet AC Coupling without
external transformer. From 20~23 respectively are are
Ethernet 2 input-, input+, output-, output+.
21
RX2+
I
22
TX2-
O
23
TX2+
O
Figure 2 Pin definition

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2.Hardware Design
2.1. Typical Connection
Figure 3 Typical connection
1. nRST: Input pin. Resetting the module and taking effect in low level. nRST pin connect to internal 100K
Ohm pull-up resistor to 3.3V. Press over 300ms and release to reset the device.
2. nReady: Output pin. Output low level(or heartbeat signal) after module starting normally. nReady pin
connect to internal 4.7K Ohm pull-up resistor to 3.3V.
3. nLink: Output pin. Output low level when module connect to AP or has STA device connect to module in
AP mode. nLink pin connect to internal 4.7K Ohm pull-up resistor to 3.3V.
4. nReload: nReload pin can connect to external button or configuration pin. Press over 3s to restore default
settings. nReload pin should connect to external 4.7k-10k Ohm pull-up resistor.
2.2. Power Interface
USR-WIFI232-D2 adopt single-voltage 3.3 V power supply. Peak current is about 350mA, work current is
about 200mA and sleep mode current is 100mA.
The power filter is recommended to be used near the connector of the user board, and it is recommended to
use three parallel decoupling capacitors with 100uF, 10uF and 100nF to improve the stability of the system
and wireless performance.

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2.3. UART Interface
UART is serial data interface that can connect the RS-232 chip and transfer to the RS-232 level. UART
interface includes TXD/RXD/RTS/CTS.Take the RS-232 level as a reference circuit diagram as follow:
Figure 4 UART interface
2.4. 10/100M Ethernet Interface
USR-WIFI232-D2 provide two 10/100M Ethernet Interfaces and support Ethernet Interface with transformer
design.
Put Ethernet transformer and RJ45 connector on user board is a standard 10/100M Ethernet Interface.
Reference circuit diagram as follow:
Figure 5 10/100M Ethernet Interface

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2.5. Antenna
USR-WIFI232-D2 adopt externally installed antenna. USR-WIFI232-D2 need connect to the 2.4GHz antenna
that conforms to 802.11b/g/n.The specific parameters of the antenna as the following table:
Frequency
2.4~2.5GHz
Impedance
50 Ohm
VSWR
2 (Max)
Return Loss
-10dB (Max)
Connector
I-PEX or populate directly
Figure 6 Antenna standards

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3.Contact
Company: Jinan USR IOT Technology Limited
Address: Floor 11, Building No.1, No.1166, Xinluo Street, Gaoxin District, Jinan city, Shandong province,
250101 China
Tel: [phone]
Web: www.usriot.com
Support: h.usriot.com
Email: [email protected]n
4.Disclaimer
This document provide the information of USR-WIFI232-D2 products, it hasn’t been granted any intellectual
property license by forbidding speak or other ways either explicitly or implicitly. Except the duty declared in
sales terms and conditions, we don’t take any other responsibilities. We don’t warrant the products sales and
use explicitly or implicitly, including particular purpose merchant-ability and marketability, the tort liability of
any other patent right, copyright, intellectual property right. We may modify specification and description at
any time without prior notice.
5.Update History
2017-10-10 V1.0.12.01 created.