Silicon Labs announced the BG2B on August 4, 2026 — a Bluetooth 6 system-on-chip that for the first time brings the full Channel Sounding ranging feature set to a chip designed to spend years on a single coin-cell battery. The announcement arrives five weeks before the EU Cyber Resilience Act's first enforcement deadline — a regulatory clock that is actively reshaping which silicon choices are viable for device makers selling into European markets.

How Channel Sounding Works — and Why It Matters Now

Bluetooth's approach to distance measurement has gone through three generations. The first relied on Received Signal Strength Indication (RSSI), estimating proximity from how loud a signal sounded — a method that multipath reflections could shift by meters in a cluttered environment. The second, introduced in Bluetooth 5.1 in 2019, added direction finding via Angle of Arrival and Departure measurements, narrowing location to sub-meter directional accuracy. Channel Sounding, introduced in the Bluetooth Core Specification 6.0 released by the Bluetooth SIG in September 2024, is the third generation: it uses Phase-Based Ranging (PBR) and Round-Trip Time (RTT) measurements to calculate actual distance between two devices, targeting centimeter-level accuracy.

PBR measures how the phase of a signal shifts as the same exchange is repeated across dozens of different radio channels — because phase rotation is proportional to distance, and averaging across channels filters out the multipath corruptions that plague single-frequency measurements. RTT measures the round-trip travel time of a precisely timed exchange. Because both methods work on entirely different physical principles, an attacker attempting to spoof proximity would need to defeat both simultaneously — which is why Channel Sounding is also the first Bluetooth ranging method with formal relay-attack resistance.

The BG2B implements Channel Sounding's Mode 3 — the most secure and accurate mode, using both PBR and RTT concurrently — along with two additional safety mechanisms: the Normalized Attack Detector Metric (NADM), which analyzes signal characteristics to detect potential interception, and Inline Phase Correction Term (Inline PCT), which corrects for oscillator offset between the two communicating devices and directly improves ranging accuracy. Silicon Labs states the chip meets both Apple's and Google's Bluetooth Channel Sounding interoperability specifications — a prerequisite for any commercial application expecting to communicate with consumer smartphones.

The commercial context for Channel Sounding adoption is growing. The BLE indoor location market reached an estimated $4.3 billion in 2025 and is projected to reach $11.8 billion by 2030, growing at a compound annual rate of 22.5%. The broader Bluetooth 6.0 market was valued at $5.42 billion in 2025 and is forecast to reach $17.47 billion by 2035. Silicon Labs is positioning the BG2B to capture a share of that growth at the silicon level.

A New Power Floor for Battery-Powered Endpoints

The headline specification is a sleep current of 1.1 µA in the EM2 energy mode with RAM retention — the low-power state where battery-operated devices spend the overwhelming majority of their time. When active, the chip draws 14 to 15% less MCU current and lower Bluetooth receive current than Silicon Labs' previous lowest-power Bluetooth LE SoC, the BG22/BG22L family.

The engineering architecture behind this is a dual-output DC-DC power converter combined with a multi-core processor design. A conventional single-rail power supply forces every subsystem in the SoC to operate at the same voltage, requiring costly regulation conversions and wasting power in the process. A dual-output DC-DC allows the chip to feed different subsystems — the radio, the processor core, the security engine — at independent voltages optimized for each, recovering efficiency at every domain boundary. The multi-core design extends this: the radio core can handle Bluetooth protocol work while the application core stays in a gated idle state, and vice versa.

For the product categories the chip targets — wireless sensors, electronic shelf labels (ESLs), asset tracking tags, smart locks, remotes, wearables, and industrial monitoring nodes — even modest current reductions translate directly into months of added battery life. In markets where battery replacement across thousands of distributed sensor nodes is a logistics and cost burden, extending a coin-cell-powered design from one year of operation to two or more has a compounding economic effect on total deployment cost.

What Sets the BG2B Apart from Nordic and the Rest of the Competitive Field

The ultra-low-power Bluetooth LE SoC market is competitive. Nordic Semiconductor's nRF54L15, built on a 22nm process node, integrates a 128 MHz ARM Cortex-M33 alongside a RISC-V coprocessor and demonstrated end-to-end Bluetooth Channel Sounding interoperability with an open-source Android app and the Google Pixel 10 in October 2025, achieving a measured ranging accuracy of approximately ±1 m at distances up to 20 m. Texas Instruments' CC2340 family offers competitive sleep currents and a strong ecosystem.

Silicon Labs' differentiation with the BG2B rests on several factors that individually have precedents but together are unusual at this integration level. First, its Channel Sounding implementation explicitly targets both Apple's and Google's interoperability specifications — a specific claim about ecosystem reach that Nordic's publicly documented demo did not assert. Second, the chip integrates a CAN-FD bus interface alongside the Bluetooth radio — a combination rare enough to expand the addressable market into commercial vehicle fleet diagnostics and industrial equipment monitoring without requiring a separate Bluetooth bridge. Third, Secure Vault High targets PSA Level 3 certification, the highest tier in the Platform Security Architecture scheme, covering the BG2B against the class of physical hardware attacks that PSA Level 2 and below explicitly exclude.

Whether Silicon Labs' Channel Sounding accuracy claims hold up independently is currently unverifiable: the BG2B is not yet in volume production, and no independent benchmarking organization has published results for this specific chip. Developers evaluating the platform should treat the published accuracy specifications as design targets, not validated measurements — a standard caveat for any pre-production silicon.

What the CAN-FD and LED Integration Actually Solves

The BG2B's integrated peripheral set story is as much a bill-of-materials argument as a technical one.

The CAN-FD integration addresses a specific pain point: wireless IoT monitoring of commercial vehicles and industrial machinery normally requires either a separate Bluetooth module added to an existing CAN-FD design, or a dedicated bridge chip sitting between the vehicle bus and the wireless link. Integrating CAN-FD directly into the BLE SoC eliminates both. A fleet management sensor node that reads vehicle data from the CAN-FD bus and transmits it wirelessly can be built around a single chip rather than two or three.

For electronic shelf labels — a market growing alongside smart retail deployments — the integrated LED boost circuitry and four-channel LED sink capability eliminate the external LED driver ICs that would otherwise be needed to drive the RGBW LED indicators that signal price updates, low-stock alerts, or promotional states. Dual 12-bit analog-to-digital converters enable simultaneous sampling from two sensor inputs — useful for environmental nodes measuring temperature and humidity in parallel without serializing the reads. A Variable Resistive Load function estimates battery internal resistance, allowing devices to calculate remaining capacity and predict failure rather than simply going dead without warning.

Silicon Labs frames this integration as a system-cost story: fewer external components means smaller PCBs, simpler assembly processes, and lower total product cost per unit — savings that compound significantly at the deployment scales typical of industrial sensor networks.

Built for the EU's September Deadline

As connected devices face increasingly stringent cybersecurity mandates, the BG2B's Secure Vault High security subsystem addresses a compliance window that is now weeks away rather than years.

The EU Cyber Resilience Act — formally Regulation (EU) 2024/2847 — entered into force in December 2024 and established mandatory cybersecurity requirements for products with digital elements sold in the EU market. Two deadlines govern the rollout. Article 14's vulnerability reporting obligations, which require manufacturers to notify EU authorities of actively exploited vulnerabilities and severe security incidents within 24 to 72 hours of discovery, take effect September 11, 2026 — five weeks from now. Full compliance, including CE marking requirements for all IoT products placed on the EU market, becomes mandatory December 11, 2027.

Device makers who launch products for the European market in 2027 — the same timeline as the BG2B's volume production — will need silicon that supports a compliant security architecture from day one of manufacturing, not as a retrofit. PSA Level 3 compliance, which the BG2B is designed to support, requires demonstrated resistance against scalable physical hardware attacks: an attacker with physical device access should not be able to extract cryptographic keys or compromise the root of trust. Silicon Labs also offers its Custom Part Manufacturing Service, which allows manufacturers to inject unique device identities, signed certificates, and cryptographic credentials during the manufacturing process itself — addressing the notoriously difficult problem of bootstrapping device identity at production scale.

What the Texas Instruments Deal Means for Engineers

There is a business-context dimension to the BG2B that the product announcement does not address directly, but that is material for any engineer making a multi-year design commitment to Silicon Labs' platform.

On February 4, 2026, Texas Instruments announced a definitive acquisition agreement for Silicon Labs at $231.00 per share in an all-cash transaction representing a total enterprise value of approximately $7.5 billion. The transaction is subject to regulatory approvals and customary closing conditions, with TI and Silicon Labs both citing an H1 2027 expected close.

That timeline coincides almost exactly with the BG2B's volume production schedule. An engineer who begins development work on a BG2B-based product today, using Silicon Labs' current Simplicity Studio SDK, community support infrastructure, and channel relationships, will likely be in production engagement with Texas Instruments — not Silicon Labs as currently constituted — by the time volume shipments begin.

TI has described the acquisition as combining Silicon Labs' wireless connectivity portfolio with TI's manufacturing scale and analog processing IP, with annual synergies of $450 million expected within three years of close. What that means for SDK support continuity, product naming, and the IoT-specific tools that Silicon Labs has developed — including Simplicity Studio and the Gecko SDK — has not been publicly committed to in detail.

None of this makes the BG2B a poor design choice. Texas Instruments is one of the most durable embedded semiconductor companies in existence, with a long track record of supporting acquired product lines. The point is that engineers should evaluate the BG2B as a TI product-in-waiting, not purely as a Silicon Labs roadmap commitment.

Availability: Early Access Now, Volume in 2027

The BG2B is now available via early customer engagement, allowing development teams access to initial silicon ahead of full commercial availability. Volume production hardware — including wireless modules — is planned for 2027.

The ten SKU variants under the EFR32BG2B designation all support Bluetooth 6.x, direction finding, and 2.4 GHz proprietary wireless protocols. Optional features — Channel Sounding, LED sink, CAN-FD bus — vary by SKU, as do RAM capacity and GPIO count, giving hardware designers the ability to select the configuration that matches their application's specific requirements and cost targets without paying for unused capability.

The gap between announcement and volume production is consistent with industry norms for complex SoC programs. Development teams planning products for 2027 launches should engage the early access program now to secure samples and build against the SDK before volume availability opens.

Does This Chip Threaten UWB?

Bluetooth Channel Sounding's most commercially significant implication — one the Bluetooth SIG and Silicon Labs both acknowledge but neither overstates — is its potential to displace Ultra-Wideband (UWB) silicon in a subset of applications where UWB currently holds a near-monopoly on precision.

UWB uses extremely short pulses transmitted across a wide frequency spectrum to calculate distance through time-of-flight measurements. The technique achieves high precision — typically ±10 to ±30 cm (approximately 4 to 12 inches) indoors — but requires a dedicated UWB radio chip, adding cost and board space to any design. The UWB indoor location market is projected to grow from $1.65 billion in 2025 to $4.94 billion by 2030.

Channel Sounding achieves sub-meter accuracy without a separate radio — the ranging is done entirely over the Bluetooth 6.0 radio already present in the SoC. For applications where UWB precision is needed primarily for asset tracking in a warehouse, a hospital, or a retail environment — rather than for the directional "find my item" experience on a consumer phone — Channel Sounding on a BLE chip like the BG2B is a viable alternative that requires no additional silicon.

The caveat is ecosystem reach: Channel Sounding works only when both communicating endpoints support Bluetooth 6.0. Phones with Bluetooth 6.0 hardware remain limited to recently released high-end models as of mid-2026, and that limitation affects any application that depends on smartphone interaction at the ranging endpoint. In infrastructure-to-tag ranging deployments — where the Bluetooth 6.0 access point is infrastructure the deployer controls — this phone compatibility gap is irrelevant.

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Frequently Asked Questions

What is Bluetooth Channel Sounding, and how does it differ from standard Bluetooth location?

Standard Bluetooth location estimates proximity by measuring signal strength — a method that multipath reflections in indoor environments can shift by several meters. Channel Sounding, introduced in Bluetooth Core Specification 6.0, uses two complementary ranging methods: Phase-Based Ranging and Round-Trip Time. PBR measures how the phase of a radio signal varies with distance by probing dozens of channels sequentially; RTT measures the travel time of a precisely timed signal exchange. Together they achieve sub-meter accuracy in cluttered environments where RSSI fails, and their dual-method design provides formal resistance against relay attacks — a security property that standard proximity detection does not offer.

How does the BG2B's approach to indoor ranging compare to UWB hardware?

UWB achieves typically ±10 to ±30 cm (4 to 12 inches) accuracy using a dedicated radio chip operating across a wide frequency spectrum — hardware that adds cost and board area. Bluetooth Channel Sounding achieves sub-meter accuracy over the same Bluetooth 6 radio that handles standard connectivity, with no additional silicon required. For asset tracking applications where ranging is infrastructure-to-tag (warehouses, hospitals, retail), Channel Sounding on a BLE SoC is a viable and potentially more economical choice. For consumer "find my item" precision finding on a smartphone, Channel Sounding's limitation is that the phone must also support Bluetooth 6.0 — hardware still limited to high-end devices as of mid-2026.

What does the EU Cyber Resilience Act actually require, and when does it start?

Regulation (EU) 2024/2847 sets mandatory cybersecurity requirements for all hardware and software products with digital elements sold in the EU — including virtually all IoT devices. There are two deadlines: Article 14 vulnerability reporting obligations (notifying EU authorities of actively exploited vulnerabilities and severe incidents within 24 to 72 hours) take effect September 11, 2026. Full compliance — including CE marking requirements and the full secure-by-design obligations — becomes mandatory December 11, 2027. Device makers targeting the EU market should note that the September 2026 deadline is now weeks away, making security-compliant silicon choices an immediate engineering concern, not a 2027 planning item.

What does the Texas Instruments acquisition mean for engineers designing with Silicon Labs products?

Texas Instruments announced a definitive agreement to acquire Silicon Labs in February 2026 for approximately $7.5 billion, with the transaction expected to close in the first half of 2027 — the same timeframe as the BG2B's volume production schedule. Engineers beginning development work on BG2B-based products today are making a long-term commitment to a platform that will be owned and supported by Texas Instruments before volume shipments begin. TI has described the acquisition as combining Silicon Labs' wireless connectivity portfolio with TI's manufacturing scale, with expected synergies of approximately $450 million annually within three years. What that means for SDK support continuity, community resources, and product naming has not been committed to in detail — engineers should ask directly about post-acquisition roadmap commitments when engaging the early access program.