CYW20704
1. Overview
1.1 Overview
The Cypress CYW20704 complies with Bluetooth Core Specification, version 4.1+ HS and is designed for use in standard Host Con-
troller Interface (HCI) UART and HCI USB applications. The combination of the Bluetooth Baseband Core (BBC), a Peripheral
Transport Unit (PTU), and a Cortex-M3 based microprocessor with on-chip ROM provides a complete lower layer Bluetooth protocol
stack, including the Link Controller (LC), Link Manager (LM), and HCI.
1.2 Major Features
Major features of the CYW20704 include:
■ Bluetooth v4.1 + EDR with integrated Class 1 PA
■ BT host digital interface (can be used concurrently with below interfaces):
❐ USB 2.0 full-speed with LPM support (up to 12 Mbps)
❐ UART (up to 4 Mbps)42
■ Integrated RF section
❐ Single-ended, 50Ω RF interface
❐ Built-in TX/RX switch functionality
❐ TX Class 1 output power capability
❐ RX sensitivity basic rate of –93.5 dBm
❐ RX sensitivity for Low Energy of –96 dBm
■ GCI-enhanced coexistence support, ability to coordinate BT SCO transmissions around WLAN receives
■ Supports maximum Bluetooth data rates over HCI and USB interfaces
■ I2S/PCM for BT audio
■ HCI high-speed UART (H4, H4+) transport support
■ Wideband speech support (16 bits linear data, MSB first, left-justified at 4K samples/s for transparent air coding, both through I2S
and PCM interface)
■ Bluetooth SmartAudio® technology improves voice and music quality to headsets
■ Bluetooth low-power inquiry and page scan
■ Bluetooth low energy (BLE) support
■ Supports Cypress proprietary 2 Mbps low energy mode
■ Maximum of 127 LE Connections
■ Supports TBFC (Triggered Cypress [Bluetooth] Fast Connect)
■ Bluetooth packet loss concealment (PLC)
■ Bluetooth wide band speech (WBS)
■ High-speed HCI UART transport support
❐ H4 five-wire UART (four signal wires, one ground wire)
❐ Maximum UART baud rates of 4 Mbps
❐ Low-power out-of-band BT_WAKE and HOST_WAKE signaling
❐ VSC from host transport to UART
❐ Proprietary compression scheme (allows more than two simultaneous A2DP packets and up to five devices at a time)
■ HCI USB transport support
❐ USB version 2.0 full-speed compliant interface with LPM support
❐ UHE (proprietary method for emulating a human interface device (HID) at system boot up)
■ Standard Bluetooth test modes
■ Extended radio and production test mode features
Document Number: 002-14786 Rev. *E
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