MRF24J40MAT-I/RM

MRF24J40MAT-I/RM is Microchip’s 2.4 GHz IEEE 802.15.4 radio transceiver module. It combines the RF front end, PLL and crystal with an SPI-controlled interface, so a host MCU can implement an LR-WPAN link (802.15.4, MiWi, ZigBee). The module is a radio companion with no built‑in MAC, so the host handles the network layer while the transceiver handles the PHY/FRONT end.
Key interface and operation:
- 4‑wire SPI: SCK, SDI, SDO, CS#, plus an IRQ line and a RESET input
- Supply: typically 3.3 V
- Spectrum: 2.4 GHz band, 16 channels (11–26), up to 250 kbps data rate
- TX/RX FIFOs, auto-ACK, multiple power modes for low power
MAT indicates module form factor; I typically denotes industrial temperature; RM denotes reel/packaging (check datasheet for exact meaning).
Common uses: wireless sensors, home/industrial automation, IoT nodes. Development paths: Microchip MiWi or ZigBee IP stacks, or direct register-level access per the datasheet.

Key features of MRF24J40MAT-I/RM (IEEE 802.15.4 2.4 GHz transceiver)
- IEEE 802.15.4 PHY/MAC support in the 2.4 GHz band; compatible with ZigBee/6LoWPAN
- Data rate: 250 kbps; modulation: O-QPSK with DSSS
- 16 channels available in 2.4 GHz (channels 11–26)
- SPI serial interface for register access and data transfer; IRQ signaling
- Fully integrated RF front-end (PLL, VCO, mixer, LNA, PA) with programmable TX output power
- MAC/PHY features: hardware-like frame handling, automatic CRC, address filtering (short/extended), PAN ID filtering, auto-ACK and auto-retry
- TX/RX FIFOs; RSSI/LQI measurement for link quality
- Low-power operation with sleep/duty-cycle capability
- Supply voltage 2.0–3.6 V; industrial temperature variant available (-40°C to +85°C)
- Package: MAT-I/RM module format; suitable for direct MCU integration via SPI
- Ideal for mesh/point-to-point 802.15.4 implementations with Microchip/third-party stacks

- Pin count: 48 pins (QFN-48 package).
- Function: 2.4 GHz IEEE 802.15.4 transceiver (MRF24J40) with integrated MAC, intended to be controlled by a host MCU over SPI. RF I/O pins are RF_P and RF_N (antenna connection). Includes power/ground pins (VDD/VSS and multiple GND), SPI interface pins (SCK, SI, SO, CSN), and control/interrupt pins (RESET, IRQ), plus additional power/clock pins as required.

- Manufacturer: Microchip Technology Inc.
- What kind of company: A global semiconductor company that designs and manufactures embedded control solutions, including microcontrollers, memory, analog devices, and wireless connectivity products.

MRF24J40MAT-I/RM is a 2.4 GHz IEEE 802.15.4 transceiver module. Typical applications include:
- Wireless sensor networks and IoT end nodes (environmental, agricultural, asset monitoring)
- Home and building automation (lighting, HVAC, security, access control)
- Industrial automation and remote monitoring/control (machine sensing, energy management)
- Smart metering and utilities data collection
- IoT gateways and mesh networks (ZigBee, 6LoWPAN, other 802.15.4-based stacks)
- Remote data acquisition/telemetry for portable or embedded systems
- Wireless peripherals and consumer electronics interfaces

It uses a 28‑pin QFN package (5x5 mm). RoHS compliant; industrial temperature range (I).