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2.2 Sterling-LWB Wi-Fi + Bluetooth Combo Module
The Sterling-LWB module provides 802.11b/g/n and Bluetooth 4.1 functionality when used with an
STM32F4xx microcontroller compatible with the Cypress WICED SDK. The interfaces to the module are
SDIO for Wi-Fi and UART for Bluetooth. The module antenna is either a chip antenna (on the module), or
an external antenna connected to the U.FL connector (J1).
2.3 USB JTAG and Serial Interface
The board provides a single micro-USB interface for JTAG programming and access to the UART1 serial
interface of the STM32F411 MCU. The JTAG interface is provided via a standard FTDI FT2232H IC with its
VID and PID updated to be a WICED debugger (VID: 0x0a5c PID: 0x43fa).
IMPORTANT:
The USB SWD debug interface on the Discovery board is not used. The WICED SDK assumes a JTAG
debugger, which is provided on the Expansion Board.
In order to use the debug UART (UART 1), a conflicting capacitor must be removed on the Discovery
board. The capacitor is C54 and it is connected to PA9 on the Discovery Board processor. Please refer
to the schematic for the STM32F411E-DISCOVERY from STMicroelectronics.
The information in this document is subject to change without notice.
330-0234-R1.2
Figure 3 -Remove C54 From Discovery Board
Copyright ©2016-2017 LSR
Sterling-LWB STM Expansion Board
USER GUIDE
Page 5 of 25
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