Renesas M306N5FCTFP#B0J

Overview

CYRF6936 from Cypress Semiconductor is a 2.4 GHz WirelessUSB™ LP Radio SoC integrating DSSS/GFSK transceiver, 16-byte TX/RX FIFOs, Auto Transaction Sequencer (ATS), Power Management Unit (PMU), and SPI interface - delivering up to +4 dBm output power, –97 dBm receive sensitivity, and 1 Mbps GFSK data rate for ultra-low-power wireless peripherals.

For engineers reviewing the CYRF6936 datasheet, CYRF6936 pinout, CYRF6936 application, or CYRF6936 equivalent, this page provides verified technical context, validated pin functions, real-world use cases in battery-operated human-interface devices, and confirmed alternative parts with documented functional trade-offs.

Technical Context

The CYRF6936 implements a dual-conversion low-IF 2.4 GHz radio architecture with integrated PA, LNA, and RSSI circuitry, supporting 98 discrete 1 MHz ISM channels and fast synthesizer settling (≤100 µs on 25 designated "fast" channels). Its baseband handles DSSS spreading/despreading, SOP/EOP detection, CRC16 generation/checking, and AutoRate™ dynamic data rate adaptation.

It features an autonomous Auto Transaction Sequencer (ATS) that executes full transmit–ACK or receive–ACK sequences without MCU intervention for ≤16-byte packets, while its PMU delivers regulated 1.8 V logic supply and configurable 2.4–2.7 V VREG output (up to 15 mA) directly from 1.8–3.6 V battery input - enabling coin-cell operation without external regulators.

Key Specifications

Pinout & Package

40-pin QFN package (6 × 6 mm, 0.5 mm pitch) with exposed thermal pad (E-PAD) requiring solder connection to ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2.4 GHz ISM-band radio SoC applications.

Compared with Nordic nRF24L01+ and Silicon Labs Si4463, the CYRF6936 uniquely combines 2.4 GHz ISM operation, hardware ATS, integrated PMU, and sub-1 µA sleep - making it the only option among the three qualified for coin-cell-powered, firmware-light wireless keyboards and gamepads requiring certified interoperability with legacy WirelessUSB™ hosts.

Availability

CYRF6936 is available at Aetrix Electronics and suitable for wireless human-interface devices, battery-constrained remote controls, and low-latency gaming peripherals requiring stable component supply, long-term lifecycle assurance, and full regulatory documentation support.

Supply support for CYRF6936 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable system-on-chip (PSoC), memory, and connectivity solutions for industrial, automotive, and consumer markets.

The CYRF6936 belongs to Cypress's WirelessUSB™ LP Radio SoC product line, engineered specifically for ultra-low-power, cost-sensitive 2.4 GHz human-interface devices requiring seamless interoperability with existing USB wireless dongles and minimal host-side driver changes.

FAQ

What is the primary function of the CYRF6936 in a wireless system?

The CYRF6936 serves as a complete 2.4 GHz WirelessUSB™ LP Radio SoC, integrating transceiver, packet framer, Auto Transaction Sequencer (ATS), Power Management Unit (PMU), and SPI interface. It enables self-contained wireless communication for HID devices without requiring external regulators or complex MCU firmware - the CYRF6936 handles modulation, ACK generation, sleep/wake timing, and battery regulation internally.

Does the CYRF6936 support direct connection to a coin-cell battery?

Yes, the CYRF6936 supports direct connection to a single CR2032 coin cell (nominal 3 V) via its VBAT pins. Its integrated PMU regulates down to 1.8 V logic supply and provides configurable VREG output, while its <1 µA sleep current enables multi-year operation - confirmed in Cypress Application Note AN72202 for CYRF6936-based keyboard reference designs.

Can the CYRF6936 interoperate with first-generation WirelessUSB™ devices?

Yes, the CYRF6936 is explicitly designed for interoperability with first-generation CYWUSB69xx devices, as stated in the Functional Description section of datasheet 38-16015 Rev. *K. This backward compatibility ensures seamless integration into existing WirelessUSB™ ecosystems, including certified USB dongles and host drivers, without firmware or protocol modifications.

What is the role of the Auto Transaction Sequencer (ATS) in the CYRF6936?

The ATS automates full packet transactions: for transmission, it starts the crystal/synthesizer, sends the payload, switches to receive mode, and waits for ACK - all without MCU intervention. For reception, it automatically replies with ACK upon valid packet detection. This feature is fully operational for ≤16-byte packets and is central to the CYRF6936's low-firmware-footprint design philosophy.

Is an external crystal required for CYRF6936 operation, and what are its specifications?

Yes, a 12 MHz fundamental-mode parallel-resonant crystal with ±30 ppm stability, <60 Ω series resistance, 10 pF load capacitance, and ≤100 µW drive level must be connected directly between XTAL and GND - no external capacitors needed. This specification is mandatory for guaranteed timing accuracy, synthesizer lock, and regulatory compliance per datasheet Section "Clocks".