WICED™ IEEE 802.11 a/b/g/n SoC with an
Embedded Applications Processor
The Cypress CYW43903 embedded wireless system-on-a-chip (SoC) is uniquely suited for Internet-of-Things applications. It sup-
ports all rates specified in the IEEE 802.11 b/g/n specifications.The device includes an ARM Cortex-based applications processor, a
single stream IEEE 802.11n MAC/baseband/radio, a power amplifier (PA), and a receive low-noise amplifier (LNA). It also supports
optional antenna diversity for improved RF performance in difficult environments.
The CYW43903 is an optimized SoC targeting embedded Internet-of-Things applications in the industrial and medical sensor, home
appliance markets. Using advanced design techniques and process technology to reduce active and idle power, the device is
designed for embedded applications that require minimal power consumption and a compact size.
The device includes a PMU for simplifying system power topology and allows for direct operation from a battery while maximizing
Cypress Part Numbering Scheme
Cypress is converting the acquired IoT part numbers from Broadcom to the Cypress part numbering scheme. Due to this conversion,
there is no change in form, fit, or function as a result of offering the device with Cypress part number marking. The Table 1 provides
Cypress ordering part number that matches an existing IoT part number.
Table 1. Mapping Table for Part Number between Broadcom and Cypress
Broadcom Part Number
Cypress Part Number
Application Processor Features
■ ARM Cortex-R4 32-bit RISC processor.
■ 1 MB of on-chip SRAM for code and data.
■ An on-chip cryptography core
■ 640 KB of ROM containing WICED SDK components such
as RTOS and TCP/IP stack.
■ 17 GPIOs supported.
■ Q-SPI serial flash interface to support up to 40 Mbps of peak
■ Support for UART (3), SPI or CSC master, interfaces.
(Cypress Serial Control (CSC) is an I2C-compatible inter-
Key IEEE 801.11x Features
■ Single-band 2.4 GHz IEEE 802.11n compliant.
■ Single-stream spatial multiplexing up to 72 Mbps.
■ Supports 20 MHz channels with optional SGI.
■ Full IEEE 802.11 b/g legacy compatibility with enhanced per-
■ TX and RX low-density parity check (LDPC) support for
improved range and power efficiency.
■ On-chip power and low-noise amplifiers.
■ An internal fractional nPLL allows support for a wide range of
reference clock frequencies.
■ Integrated ARM Cortex-R4 processor with tightly coupled
memory for complete WLAN subsystem functionality, mini-
mizing the need to wake up the applications processor for
standard WLAN functions (to further minimize power con-
sumption while maintaining the ability to upgrade to future
features in the field).
■ Software architecture supported by standard WICED SDK
allows easy migration from existing discrete MCU designs
and to future devices.
■ Security support:
❐ WPA and WPA2 (Personal) support for powerful encryp-
tion and authentication.
❐ AES and TKIP in hardware for faster data encryption and
IEEE 802.11i compatibility.
❐ Reference WLAN subsystem provides Cisco Compatible
Extensions (CCX, CCX 2.0, CCX 3.0, CCX 4.0, and CCX
❐ Wi-Fi Protected Setup and Wi-Fi Easy-Setup
■ Worldwide regulatory support: Global products supported
with worldwide design approval.
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 002-14826 Rev. *G
• San Jose, CA 95134-1709 • 408-943-2600
Revised January 11, 2018