EFR32BG27 Series 2 Small Bluetooth LE SoC

EFR32BG27 Series 2 Bluetooth® Wireless SoC

The EFR32BG27 family of wireless SoCs opens up new possibilities by offering an ultra-small WLCSP package (2.3 mm x 2.6 mm) capable of running on button cell batteries. Now device makers can address applications with extremely small form-factor requirements without sacrificing performance and security. The BG27 Bluetooth SoC features an integrated DCDC boost that allows operation down to 0.8 volts, enabling support for single-cell alkaline and 1.5-volt button cell batteries that are typically used in medical applications for battery-operated patches and continuous glucose monitoring (CGM) devices. Additionally, the wakeup pin on the BG27 allows products in a warehouse or transit to remain off for months, consuming less than 20 nA, ensuring the battery remains fully charged for use. The integrated coulomb counter enables accurate battery level monitoring to avoid unexpected battery depletion for critical applications. Target applications include connected medical devices, wearables, sensors, switches, smart locks, and both commercial and LED lighting.

EFR32BG27 Common Specs

Low Power Wireless System-on-Chip

High Performance 32-bit 76.8 MHz ARM Cortex®-M33 with DSP instruction and floating-point unit for efficient signal processing
Up to 768 kB flash program memory
Up to 64 kB RAM data memory
2.4 GHz radio operation

Radio Performance

106.9 dBm sensitivity @ 125 kbps GFSK
-99.2 dBm sensitivity @ 1 Mbit/s GFSK
-96.3 dBm sensitivity @ 2 Mbit/s GFSK
TX power up to 8 dBm

Low System Energy Consumption

3.6 mA RX current (1 Mbps GFSK)
4.1 mA TX current @ 0 dBm output power
9.2 mA TX current @ 6 dBm output power
11.3 mA TX current @ 8 dBm output power
29 μA/MHz in Active Mode (EM0) at 76.8 MHz
1.6 μA EM2 DeepSleep current (64 kB RAM retention and RTC running from LFRCO)
0.18 μA EM4 current

Wide Selection of MCU Peripherals

16-bit Analog to Digital Converter (IADC)
Analog Comparator (ACMP)
Up to 26 General Purpose I/O pins with output state retention and asynchronous interrupts
8 Channel DMA Controller
12 Channel Peripheral Reflex System (PRS)
3 × 16-bit Timer/Counter with 3 Compare/Capture/PWM channels
2 × 32-bit Timer/Counter with 3 Compare/Capture/PWM channels
32-bit Real Time Counter
24-bit Low Energy Timer for waveform generation
1 × Watchdog Timer
2 × Universal Synchronous/Asynchronous Receiver/Transmitter (UART/SPI/SmartCard (ISO 7816)/IrDA/I2S)
1 × Enhanced Universal Asynchronous Receiver/Transmitter (EUART)
2 × I2C interface with SMBus support
Digital microphone interface (PDM)
Precision Low-Frequency RC Oscillator to replace 32 kHz sleep crystal
RFSENSE with selective OOK mode
Die temperature sensor with +/- 1.5 °C accuracy after single-point calibration
Coulomb counter integrated into DC-DC

Supported Modulation Format

(G)FSK with fully configurable shaping
OQPSK DSSS
(G)MSK

Protocol Support

Bluetooth Low Energy (Bluetooth 5.4)
Bluetooth mesh
Proprietary

Wide Operation Range

1.8 V to 3.8 V single power supply for devices with Buck DC-DC
0.8 V to 1.7 V single power supply for devices with Boost DC-DC
-40 °C to 125 °C

Packages

QFN40 5 mm × 5 mm × 0.85 mm
QFN32 4 mm × 4 mm × 0.85 mm
WLCSP39 2.291 mm x 2.624 mm x 0.5 mm

BG27 Security Features

Hardware Cryptographic Acceleration for AES128/192/256, ChaCha20-Poly1305, SHA-1, SHA-2/256/384/512, ECDSA+ECDH(P-192, P-256, P-384, P-521), Ed25519 and Curve25519, J-PAKE, PBKDF2
True Random Number Generator (TRNG)
ARM® TrustZone®
Secure Boot (Root of Trust Secure Loader)
Secure Debug Unlock
DPA Countermeasures
Customer Key Management with PUF
E-Tamper
Secure Attestation

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