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FSC-BW121 RTL8821CS Wi-Fi 5 + BT 5.3 Module

FSC-BW121 is a high-performance Wi-Fi Bluetooth combo module designed for integrated wireless and Bluetooth devices. It supports 1-stream 802.11ac with Multi-user MIMO, includes a WLAN MAC, a 1T1R capable WLAN baseband, and RF in a single chip. The module ensures legacy compatibility with IEEE 802.11b/g/a data rates, provides robust interference protection, and enhances signal detection and performance through adaptive frequency domain equalization and soft-decision decoding. It supports advanced power-saving mechanisms, multimedia applications, and various security protocols. Additionally, it complies with Bluetooth v5.3, supporting dual mode (BR/EDR + Low Energy) with simultaneous active links.

Features

  • General Features:
    • CMOS MAC, Baseband PHY and RF in a single chip for IEEE 802.11a/b/g/n/ac compatible WLAN
    • Support 802.11ac 1×1, Wave-2 compliant with MU-MIMO STA mode
    • Complete 802.11n MIMO solution for 2.4GHz and 5GHz band
  • Host Interface:
    • Complies with SDIO 1.1/2.0/3.0 for WLAN with clock rate up to 100 MHz (SDR50 and DDR50)
  • Standards Supported:
    • IEEE 802.11a/b/g/n/ac compatible WLAN
    • IEEE 802.11e QoS Enhancement (WMM)
    • IEEE 802.11i (WPA, WPA2). Open, shared key, and pair-wise key authentication services
    • IEEE 802.11h DFS, TPC, Spectrum Measurement
  • MAC Features:
    • Frame aggregation for increased MAC efficiency (A-MSDU, A-MPDU)
    • Low latency immediate Block Acknowledgement (BA)
    • Long NAV for media reservation with CF-End for NAV release
    • Maximum PHY data rate up to 86.7 Mbps using 20MHz bandwidth, 200 Mbps using 40MHz bandwidth, and 433.3 Mbps using 80MHz bandwidth
    • Backward compatible with 802.11a/b/g devices while operating at 802.11n data rates
    • Backward compatible with 802.11a/n devices while operating at 802.11ac data rates
    • G-SPI interface for configurable endian for WLAN
    • Complies with HS-UART with configurable baud rate for Bluetooth
    • IEEE 802.11k Radio Resource Measurement
    • WAPI (Wireless Authentication Privacy Infrastructure) certified
    • Cisco Compatible Extensions (CCX) for WLAN devices
    • PHY-level spoofing to enhance legacy compatibility
    • MIMO power saving mechanism
    • Channel management and co-existence
    • Multiple BSSID feature allows the FSC-BW121 to assume multiple MAC identities when used as a wireless bridge
    • Transmit Opportunity (TXOP) Short Inter-Frame Space (SIFS) bursting for higher multimedia bandwidth
    • WiFi Direct supports wireless peer to peer applications
  • Other Features:
    • Supports Wake-On-WLAN via Magic Packet and Wake-up frame
    • Transmit Beam forming
  • PHY Features:
    • IEEE 802.11ac OFDM
    • IEEE 802.11n OFDM
    • One Transmit and One Receive path
    • 5/10/20/40/80MHz bandwidth transmission
    • Support 2.4GHz and 5GHz band channels
    • Short Guard Interval (400 ns)
    • Sounding packet
    • DSSS with DBPSK and DQPSK, CCK modulation with long and short preamble
    • OFDM with BPSK, QPSK, 16QAM, 64QAM and 256QAM modulation. Convolutional Coding Rate: 1/2, 2/3, 3/4, and 5/6
    • WiFi NAN (Neighborhood Area Network) support
    • WiFi FTM (Fine Time Measurement) supported
    • WiFi TDLS (Tunneled Direct Link Setup) Supported
    • CCA on secondary through RTS/CTS handshake
    • Support TCP/UDP/IP checksum offload
    • Generates 40MHz clock for peripheral chip
    • Single external power source 3.3V only
    • Maximum data rate 54 Mbps in 802.11g, 150 Mbps in 802.11n and 433 Mbps in 802.11ac
    • Switch diversity used for DSSS/CCK
    • Support STBC receiving
    • Support LDPC transmitting
    • Hardware antenna diversity
    • Fast receiver Automatic Gain Control (AGC)
    • On-chip ADC and DAC
    • Build-in both 2.4GHz and 5GHz PA
    • Build-in both 2.4GHz and 5GHz LNA
  • Bluetooth Features:
    • Bluetooth 5.3, Support Simultaneous LE & BR/EDR, and High Duty Cycle Non-Connectable Advertising
    • HS-UART interface for Bluetooth data transmission compliant with H4 and H5 specification
    • PCM interface for audio data transmission via Bluetooth controller
    • Requires external MCU to execute Bluetooth protocol stack
    • Supports all packet types in basic rate and enhanced data rate
  • Bluetooth Transceiver:
    • Fast AGC control to improve receiving dynamic range
    • Integrated internal Class 1, Class 2, and Class 3 PA
    • Supports Enhanced Power Control
  • Peripheral Interfaces:
    • Supports SCO/eSCO link (allows one link for PCM interface and three links for HS-UART)
    • Supports Secure Simple Pairing
    • Enhanced BT/WLAN Coexistence Control to improve transmission quality in different profiles
    • Supports multiple Low Energy states
    • Supports Bluetooth Low Energy
    • Integrated 32K oscillator for power management

Applications

  • Internet-of-Things (IoT) Applications, including:
    • Home and Building Automation
    • Low-Power Video Cameras
    • Thermostats
    • Access Control and Electronic Locks (E-Locks)
    • Asset Tracking and Real Time Location System (RTLS) Tags
    • Cloud Connectivity
    • Internet Gateway
    • Appliances
    • Security Systems
    • Smart Energy
    • Industrial Control
    • Smart Plug and Metering
    • Wireless Audio
    • IP Network Sensor Nodes
    • Medical Devices
  • Car audio and video system

Specifications

Categories Features Implementation
Bluetooth
Bluetooth Standard Bluetooth V5.3 LE & BR/EDR
Frequency Band 2.402 ~ 2.480 GHz
Interfaces UART, PCM
Wi-Fi
Wi-Fi Standard 802.11 a/b/g/n/ac
Frequency Band 2.412 ~ 2.484 GHz / 4.900 ~ 5.925 GHz
Interface SDIO
General
Dimensions (mm) 17 × 17 × 2.4
Operating Temperature -40°C ~ +85°C
Storage Temperature -40°C ~ +85°C
VDD_3V3_WL 3.0V ~ 3.6V
VDD_IO 1.62V ~ 3.6V
Miscellaneous Lead Free Lead-free and RoHS compliant
Warranty One Year
Humidity 10% ~ 90% non-condensing
MSL grade: MSL 3
ESD grade: Human Body Model: Pass ±2000V, all pins
Charge device model: Pass ±400V, all pins

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