Texas Instruments CC2431ZRTC

Overview

CC2431ZRTC from Texas Instruments is a 2.4 GHz IEEE 802.15.4 / ZigBee® System-on-Chip integrating an 8051 MCU, 128 KB flash, 8 KB RAM, CC2420 RF transceiver core, and hardware-based Location Engine for indoor node positioning. It delivers -95 dBm receiver sensitivity, 27 mA RX/TX current, and 0.5 µA power-down mode with RTC wake-up-enabling ultra-low-power wireless sensor nodes for asset tracking and building automation.

For engineers reviewing the CC2431ZRTC datasheet, CC2431ZRTC pinout, CC2431ZRTC application, or CC2431ZRTC equivalent, key selection considerations include its QLP48 (VQFN-48) RoHS-compliant package, integrated Z-Stack™ royalty license, location engine's 0.25 m readout resolution and 50 µs–13 ms estimation time, and compatibility with CC2430-based designs requiring position-aware ZigBee endpoints.

Technical Context

The CC2431ZRTC implements a distributed location estimation algorithm using RSSI measurements from 3–16 reference nodes, with fixed-point coordinate input (0.25 m resolution) and configurable radio parameters A (30.0–50.0 dBm) and n (indexed 0–31). Its location engine operates in XDATA memory space via dedicated RF registers (REFCOORD at 0xDF55, MEASPARM at 0xDF56, LOCENG at 0xDF57).

It combines the CC2420 RF transceiver architecture-including CSMA/CA hardware acceleration, digital RSSI/LQI, and 2.0–3.6 V operation-with an enhanced 8051 core running at up to 32 MHz, two USARTs, 128-bit AES coprocessor, and ADC supporting eight inputs. All location computation occurs on-chip without host CPU intervention.

Key Specifications

Pinout & Package

CC2431ZRTC uses a 48-pin VQFN (QLP48) package with 7 mm × 7 mm footprint, 0.5 mm pitch, and exposed thermal pad requiring PCB soldering for thermal and mechanical integrity. Pin numbering follows standard QFN convention with Pin 1 marked by corner notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ZigBee® SoC applications.

Compared with CC2431ZRTC, CC2430RTC removes location capability while maintaining pin and firmware compatibility, whereas CC2530F256 offers architectural upgrades but no hardware location acceleration-making CC2431ZRTC uniquely suited for cost-sensitive, self-contained indoor positioning endpoints.

Availability

CC2431ZRTC is available at Aetrix Electronics and suitable for industrial equipment monitoring, smart building sensor networks, and asset tracking applications requiring stable component supply and legacy design continuity.

Supply support for CC2431ZRTC 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and consumer markets.

The CC2431ZRTC belongs to TI's ZigBee®-optimized SoC product line, designed specifically to integrate RF, MCU, memory, and location computation into a single low-power device for wireless sensor network endpoints.

FAQ

What distinguishes CC2431ZRTC from CC2430RTC?

The CC2431ZRTC integrates a hardware Location Engine for on-chip RSSI-based position estimation (0.25 m resolution, 50 µs–13 ms latency), while CC2430RTC lacks this module. Both share identical 8051 core, CC2420 RF transceiver, 128 KB flash, 8 KB RAM, and QLP48 packaging. CC2431ZRTC also includes a pre-paid royalty license for TI's Z-Stack™ software, eliminating per-unit licensing fees in end products.

Does CC2431ZRTC require an external crystal oscillator?

Yes, CC2431ZRTC requires a 32 MHz fundamental-mode crystal connected between XOSC_Q1 and XOSC_Q2 pins. This crystal provides the precise timing reference for the IEEE 802.15.4 MAC layer, RF synthesizer, and Location Engine calculations. No internal RC oscillator is accurate enough for compliant 802.15.4 operation.

How does the Location Engine in CC2431ZRTC compute position?

The CC2431ZRTC Location Engine performs distributed position estimation using RSSI values from 3–16 reference nodes with known coordinates. It applies a fixed-point algorithm with configurable radio parameters A (path loss at 1 m) and n (path loss exponent), outputting XY estimates in meters with 0.25 m resolution. Computation occurs entirely on-chip via dedicated RF registers (REFCOORD, MEASPARM, LOCENG) without CPU intervention.

What power modes does CC2431ZRTC support for battery-operated use?

CC2431ZRTC supports multiple low-power modes: 0.5 µA power-down with RTC wake-up, 0.3 µA power-down with external interrupt wake-up, and fast transitions (<10 µs) to active mode. In active mode, it draws 27 mA during RX/TX and supports dynamic voltage scaling. These features enable multi-year operation on coin-cell batteries in low-duty-cycle sensor applications.

Is CC2431ZRTC still recommended for new designs?

No, CC2431ZRTC is marked "Not Recommended for New Designs" per TI's official documentation (SWRS034B Rev. 2.01). It remains available for legacy design support and existing production programs, but TI recommends CC2530 or newer SimpleLink™ devices (e.g., CC2652R) for new development due to enhanced RF performance, larger memory, and extended lifecycle support.