Texas Instruments CC2544RHBT

Overview

CC2544RHBT from Texas Instruments is a 2.4-GHz system-on-chip (SoC) integrating an 8051 MCU core, 32-kB flash, 2-kB SRAM, full-speed USB 2.0 interface, and a programmable RF transceiver supporting up to 2-Mbps GFSK with –88 dBm sensitivity at 2 Mbps. It delivers 4-dBm output power, operates from 2–3.6 V, and targets USB dongle applications requiring low-BOM wireless connectivity.

For engineers reviewing the CC2544RHBT datasheet, CC2544RHBT pinout, CC2544RHBT application, or CC2544RHBT equivalent, this page provides verified technical context, validated pin functions, real-world use cases in HID and proprietary 2.4-GHz systems, and two confirmed alternative SoCs for USB-integrated RF designs.

Technical Context

The CC2544RHBT implements a single-cycle 8051 CPU with code prefetch, hardware debug support, and AES security coprocessor. Its RF section integrates a fully automated 2.4-GHz transceiver with programmable data rates (250 kbps–2 Mbps), multiple modulation formats (GFSK/MSK), and auto-acknowledgement/address decoding.

It features dual oscillators - a 32-MHz crystal oscillator (±60 ppm accuracy at 2 Mbps) and calibrated 16-MHz RC oscillator (±0.6% post-calibration) - plus a 32.753-kHz RC sleep timer. Power management supports active mode (22.5 mA RX, 27 mA TX @ 0 dBm) and ultra-low-power Mode 1 (1 mA, 4-µs wake-up).

Key Specifications

Pinout & Package

CC2544RHBT uses a 32-pin QFN package (5 mm × 5 mm) with exposed thermal pad that must be soldered to a solid ground plane per TI design guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CC2544RHBT, CC2541RHAT removes USB integration to reduce cost and power but increases BOM complexity, while CC2545RHB extends RF performance at the expense of higher current draw and less USB-centric peripheral support.

Availability

CC2544RHBT is available at Aetrix Electronics and suitable for wireless USB dongles, proprietary 2.4-GHz remote controls, industrial sensor hubs, and USB-powered audio adapters requiring stable component supply and long-term production continuity.

Supply support for CC2544RHBT 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions, with decades of RF SoC expertise and broad automotive/industrial qualification.

The CC2544RHBT belongs to TI's CC254x Bluetooth Low Energy–capable SoC family, designed specifically for cost-sensitive, USB-integrated 2.4-GHz wireless applications demanding minimal external components and fast time-to-market.

FAQ

What is the maximum RF output power of the CC2544RHBT?

The CC2544RHBT supports a maximum programmable RF output power of +4 dBm into a 50-Ω load through its differential RF_P/RF_N ports. This value is measured using the recommended balun and matching network per TI's CC2544EM reference design. The device offers 24 dB of programmable range, allowing fine-grained EIRP adjustment to comply with regional regulations such as FCC Part 15, ETSI EN 300 328, and ARIB STD-T66.

Does the CC2544RHBT include a built-in USB transceiver?

Yes, the CC2544RHBT integrates a full-speed USB 2.0 transceiver with six endpoints (including endpoint 0 and dual-direction endpoints 5), internal pull-up on D+, and a dedicated 5-V-to-3.3-V regulator. This eliminates the need for external USB PHY or level-shifting components, enabling true single-chip USB dongle designs. The USB interface operates at 12 Mbps and is fully compliant with USB 2.0 specifications.

What oscillator options does the CC2544RHBT support for system clock generation?

The CC2544RHBT supports three internal oscillators: a 32-MHz crystal oscillator (XOSC) with ±60 ppm accuracy for 2-Mbps GFSK, a calibrated 16-MHz RC oscillator (±0.6% post-calibration), and a 32.753-kHz RC sleep timer. The 32-MHz XOSC is mandatory for full-rate RF operation; the RC oscillators provide lower-power alternatives for non-critical timing or sleep-mode wake-up events.

How many general-purpose I/O pins does the CC2544RHBT provide, and what are their drive capabilities?

The CC2544RHBT provides eight general-purpose I/O pins: P0_0–P0_3 and P1_0–P1_3. Among these, P1_0 and P1_1 support 20-mA drive strength for driving LEDs or small actuators, while the remaining six pins deliver up to 4 mA. All GPIOs feature configurable pull-up/pull-down resistors (~20 kΩ) and support interrupt-on-change functionality, making them suitable for button sensing, status indication, and peripheral interfacing in USB dongles.

Is the CC2544RHBT pin-compatible with other devices in the CC254x family?

Yes, the CC2544RHBT shares the same 32-pin QFN (RHB) package and pinout with CC2541RHAT and CC2545RHB, enabling hardware reuse across variants. Key signals-including RF_P/RF_N, USB_P/USB_N, XOSC1/XOSC2, RESET_N, and all GPIOs-are identically mapped. However, functional differences exist: CC2544RHBT includes USB PHY and regulator logic not present in CC2541RHAT, and CC2545RHB adds antenna switch control on unused pins.