Introduction
The CYRF6936 WirelessUSB™ LP radio is a second generation member of the WirelessUSB Radio System-On-Chip (SoC) family. The CYRF6936 is interoperable with the first generation CYWUSB69xx devices. The CYRF6936 IC adds a range of enhanced features, including increased operating voltage range, reduced supply current in all operating modes, higher data rate options, reduced crystal start up, synthesizer settling, and link turnaround times.
The CYRF6936 IC provides a complete WirelessUSB SPI to antenna wireless MODEMs. The SoC is designed to implement wireless device links operating in the worldwide 2.4 GHz ISM frequency band. It is intended for systems compliant with worldwide regulations covered by ETSI EN 301 489-1 V1.41, ETSI EN 300 328-1 V1.3.1 (Europe), FCC CFR 47 Part 15 (USA and Industry Canada), and TELEC ARIB_T66_March, 2003 (Japan).
The SoC contains a 2.4 GHz, 1 Mbps GFSK radio transceiver, packet data buffering, packet framer, DSSS baseband controller, Received Signal Strength Indication (RSSI), and SPI interface for data transfer and device configuration.
The radio supports 98 discrete 1 MHz channels (regulations may limit the use of some of these channels in certain jurisdictions).
The baseband performs DSSS spreading/despreading, Start of Packet (SOP), End of Packet (EOP) detection, and CRC16 generation and checking. The baseband may also be configured to automatically transmit Acknowledge (ACK) handshake packets whenever a valid packet is received.
When in receive mode, with packet framing enabled, the device is always ready to receive data transmitted at any of the supported bit rates. This enables the implementation of mixed-rate systems in which different devices use different data rates. This also enables the implementation of dynamic data rate systems that use high data rates at shorter distances or in a low-moderate interference environment or both. It changes to lower data rates at longer distances or in high interference environments or both.
In addition, the CYRF6936 IC has a Power Management Unit (PMU), which enables direct connection of the device to any battery voltage in the range 1.8 V to 3.6 V. The PMU conditions the battery voltage to provide the supply voltages required by the device, and may supply external devices.
