NXP Semiconductors FRDM-CR20A

Overview

FRDM-CR20A from NXP Semiconductors (formerly Freescale) is a Freedom development board designed to evaluate the MCR20A 2.4 GHz IEEE 802.15.4 transceiver for Thread and IPv6/6LoWPAN wireless applications. It features a 32-pin LGA-mounted MCR20AVHM IC, integrated PCB inverted-F antenna, programmable RF output power (–35 dBm to +8 dBm), –102 dBm receiver sensitivity at 1% PER, and 32 MHz reference oscillator.

For engineers reviewing the FRDM-CR20A datasheet, FRDM-CR20A pinout, FRDM-CR20A application, or FRDM-CR20A equivalent, this page provides verified board-level specifications, SPI-based host MCU interface requirements, regulatory compliance status (FCC/IC/CE/UL), low-power operation modes, and hardware integration guidance for IEEE 802.15.4 node development.

Technical Context

The FRDM-CR20A implements a complete 2.4 GHz ISM-band evaluation platform centered on the MCR20A transceiver, requiring an external Kinetis MCU via SPI for full protocol stack execution. It supports IEEE 802.15.4 PHY/MAC layer functions with hardware-assisted packet filtering, automatic CRC generation/verification, and configurable sleep/wake-up sequences using dedicated GPIOs and IRQ_B signaling.

Board-level RF design includes a 1:1 Balun for differential-to-single-ended conversion, harmonic suppression components (L1/C5), and dual antenna options: integrated F-type PCB antenna and SMA connector footprint. Clocking relies on a 32 MHz ±10 ppm crystal (Y1) meeting IEEE 802.15.4 timing accuracy requirements, with CLK_OUT pin available for frequency monitoring.

Key Specifications

Availability

FRDM-CR20A is available at Aetrix Electronics and suitable for IEEE 802.15.4 evaluation, Thread network prototyping, and low-power IoT sensor node development requiring stable component supply and documented regulatory compliance.

Supply support for FRDM-CR20A 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

NXP Semiconductors acquired Freescale in 2015 and continues to support its wireless connectivity portfolio, including IEEE 802.15.4 and Thread solutions.

The FRDM-CR20A belongs to NXP's Freedom development platform family, engineered to accelerate prototyping of ultra-low-power, standards-compliant wireless nodes targeting smart home, industrial sensing, and building automation applications.

FAQ

Is the FRDM-CR20A a standalone wireless module?

No, the FRDM-CR20A is not standalone. It requires an external MCU-such as a Freescale Kinetis device-connected via SPI to execute the IEEE 802.15.4 MAC layer, Thread stack, or custom firmware. The FRDM-CR20A provides only the MCR20A transceiver PHY, clocking, RF front-end, and interface headers; all protocol logic resides off-board.

What are the antenna options supported by the FRDM-CR20A?

The FRDM-CR20A integrates a compact PCB inverted-F antenna and includes a footprint for an SMA RF connector (J5). When using the SMA port, capacitor C1 must be installed and C4 removed per the schematic. The onboard F-antenna enables immediate evaluation without external components, while the SMA option allows calibrated RF measurements or external antenna integration.

Does the FRDM-CR20A support Arduino-compatible voltage levels?

Yes, the FRDM-CR20A includes a TXB0108 level translator (U2) that shifts signals between 5 V (Arduino UNO) and 3.3 V (Kinetis MCU/transceiver) domains. The IO_REF pin on J3 auto-detects host voltage (5 V or 3.3 V), enabling seamless interfacing with both Arduino and Freescale Freedom platforms without manual configuration.

How is power managed and measured on the FRDM-CR20A?

Power is supplied through edge connectors from the host Freedom board. Two dedicated jumpers enable current measurement: P3V3_BRD (J6 pins 1–2) measures total board current (LEDs, switches, level translator), and P3V3_IC (J6 pins 1–2 with R4 removed) isolates MCR20A transceiver current. Red LED1 serves as a visual power indicator.

What regulatory certifications apply to the FRDM-CR20A?

The FRDM-CR20A carries FCC Part 15 (USA), IC RSS-210 (Canada), CE marking for ETSI EN 300 328 v1.7.1 (RF), EN 301 489-1/-17 (EMC), and UL/IEC/EN 60950-1 (safety) approvals. These authorizations cover the board in its original configuration only; modifications void compliance and require re-evaluation by the integrator.