Product Description

WT51822-S4AT BLE module profile: 

WT51822-S4AT  is a high performance ,low power radio transmit and receive system module use Nordic BLE 4.0
nRF51822 as the controller chips. It has the smallest volume package in the industry, the size is 18.5*9.1*2.0,

suitable for most applications which pay more attention to the size. The module integrate the complete standard low
energy Bluetooth 4.0 protocol stack S100 drive. Customer's MCU is connected to the module by UART
port, it will automatically send a broadcast code after the module starts. As the master, APP device can scan and
search the broadcast from module in order to establish the connection. After success, it can conduct two-way
communication link with mobile device APP by serial port. Through UART interface, the user can exchange data or
control the communication parameters of module. The meaning of data is defined by the upper application
user. The mobile device can operate to the module through APP, the data will receive by the module and
pushed through UART MCU. After the module received a data packet from the client MCU serial port, it will
be automatically forwarded to the mobile device.

WT51822-S4AT BLE module features:

• CPU: nRF51822-QFAA (ARM Cortex™-M0 32 bit processor)
• Memory: 256KB flash + 16KB RAM memory
• Transparent transmission (Bridged method) easy to use and fast, no Bluetooth protocol stack
• development experience can use too.
• The user interface uses a standard UART (TTL) Interface, bidirectional data read, easy to operate.
• Supports serial AT commands, the user can modify the basic parameters like the serial port baud rate,
• name, MAC address of the module, etc.

Application Examples of WT51822-S4AT BLE module Module

1. Accessibility BLE-DK, WT51822-DK is tool designed for easy use its Wireless-Tag BLE Bluetooth
WT51822-S1/S2/S4. You can easily connect the Bluetooth module with PC through the WT51822-DK.
The Bluetooth module works as slave device, can be searched and matched by Bluetooth master
terminal. After matched, input the data to Bluetooth module via serial port deb ing tools and the
Bluetooth module resent the data to the master module; at the same time, the Bluetooth module can
send the data received from the master module to the serial port deb ing tools.
Developers can easily check the data content between the Bluetooth module and the master terminal.
2. The connection method of DEMO-Kit Tools and Bluetooth module: DEMO-Kit Tools interface is the
currently popular XBee interface. Bluetooth module connect with Kit Tools by XBee adapter board.
Welding the module posted in the corresponding XBee adapter board, and then inserted the adapter
board into the Kit tools.

WT51822-S4AT BLE module Pin Definition