Single-Chip IEEE 802.11 b/g/n MAC/Baseband/
Radio with Integrated Bluetooth 4.2
The Cypress CYW43438 is a highly integrated single-chip solution and offers the lowest RBOM in the industry for smartphones,
tablets, and a wide range of other portable devices. The chip includes a 2.4 GHz WLAN IEEE 802.11 b/g/n MAC/baseband/radio,
and Bluetooth 4.2. In addition, it integrates a power amplifier (PA) that meets the output power requirements of most handheld
systems, a low-noise amplifier (LNA) for best-in-class receiver sensitivity, and an internal transmit/receive (iTR) RF switch, further
reducing the overall solution cost and printed circuit board area.
The WLAN host interface supports gSPI and SDIO v2.0 modes, providing a raw data transfer rate up to 200 Mbps when operating in
4-bit mode at a 50 MHz bus frequency. An independent, high-speed UART is provided for the Bluetooth host interface.
Using advanced design techniques and process technology to reduce active and idle power, the CYW43438 is designed to address
the needs of highly mobile devices that require minimal power consumption and compact size. It includes a power management unit
that simplifies the system power topology and allows for operation directly from a rechargeable mobile platform battery while
maximizing battery life.
The CYW43438 implements the world’s most advanced Enhanced Collaborative Coexistence algorithms and hardware
mechanisms, allowing for an extremely collaborative WLAN and Bluetooth coexistence.
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 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
IEEE 802.11x Key Features
■ Single-band 2.4 GHz IEEE 802.11b/g/n.
■ Support for 2.4 GHz Broadcom TurboQAM® data rates (256-
QAM) and 20 MHz channel bandwidth.
■ Integrated iTR switch supports a single 2.4 GHz antenna
shared between WLAN and Bluetooth.
■ Supports explicit IEEE 802.11n transmit beamforming.
■ Tx and Rx Low-density Parity Check (LDPC) support for
improved range and power efficiency.
■ Supports standard SDIO v2.0 and gSPI host interfaces.
■ Supports Space-Time Block Coding (STBC) in the receiver.
■ Integrated ARM Cortex-M3 processor and on-chip memory
for complete WLAN subsystem functionality, minimizing the
need to wake up the applications processor for standard
WLAN functions. This allows for further minimization of
power consumption, while maintaining the ability to field-
upgrade with future features. On-chip memory includes 512
KB SRAM and 640 KB ROM.
■ OneDriver™ software architecture for easy migration from
existing embedded WLAN and Bluetooth devices as well as
to future devices.
Bluetooth and FM Key Features
■ Qualified for Bluetooth Core Specification 4.2
❐ QDID: 100820
❐ Declaration ID: D035240.
■ Supports Bluetooth 4.2's LE Secure Connections
■ Bluetooth Class 1 or Class 2 transmitter operation.
■ Supports extended Synchronous Connections (eSCO), for
enhanced voice quality by allowing for retransmission of
■ Adaptive Frequency Hopping (AFH) for reducing radio fre-
■ Interface support — Host Controller Interface (HCI) using a
high-speed UART interface and PCM for audio data.
■ Low-power consumption improves battery life of handheld
■ Supports multiple simultaneous Advanced Audio Distribution
Profiles (A2DP) for stereo sound.
■ Automatic frequency detection for standard crystal and
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 002-14796 Rev. *L
• San Jose, CA 95134-1709 • 408-943-2600
Revised July 24, 2018