Overview

The BK7236 is a highly integrated 1×1 single-band 2.4 GHz Wi-Fi 6 (802.11b/g/n/ax) and Bluetooth 5.4 Low Energy (LE) combo solution designed for applications that require high security and abundant resources. The integration of a 32-bit ARMv8-M Star MCU and a comprehensive set of peripherals makes the BK7236 ideal for advanced Internet of Things (IoT) applications.

The BK7236 provides state-of-the-art security based on a powerful security architecture. The BK7236 integrates a IoT Platform Security Suite (IPSS) for cryptograph and system security control. The IPSS incorporates comprehensive and robust security features to establish a secure execution environment for IoT devices.

Using advanced design techniques and ultra-low power process technology, the BK7236 delivers high integration, efficient security, and minimal power consumption for a wide range of advanced IoT applications.

Features

Wi-Fi

• IEEE 802.11b/g/n/ax 1×1 compliant

• 20/40 MHz channel bandwidth for 2.4 GHz

• Supports downlink Multi-User Multiple-Input Multiple-Output (DL MU-MIMO)

• Supports Orthogonal Frequency Division Multiple Access (OFDMA)

• Supports Target Wake Time (TWT)

• TX and RX Low-Density Parity Check (LDPC) support for extended range

• WPA/WPA2/WPA3-Personal support for enhanced security

• Operating modes: STA and SoftAP

• Concurrent SoftAP + STA

• TX power up to +21 dBm

• RX sensitivity -98 dBm

Bluetooth Low Energy

• Bluetooth 5.4 Low Energy (LE)

• Supports Bluetooth Low Energy 1 Mbps, 2 Mbps, and long range (125 kbps and 500 kbps)

• Supported Bluetooth Low Energy features: LE Audio, Angle of Arrival (AoA) and Angle of Departure (AoD) direction finding, 2 Mbps, advertising extensions, and long range

• Supports an antenna array with up to 16 antennas for precise positioning

Core

• ARMv8-M Star (M33F) MCU at up to 320 MHz:

– Double-precision floating-point unit (FPU)

– 16 KB ITCM + 16 KB DTCM

– Embedded TrustZone

– Supports DSP instructions with SIMD

– 3.84 CoreMark/MHz

• UART flash download

• Serial Wire Debug (SWD) interface

Memory

• SiP flash: 4 MB or 8 MB

• SiP PSRAM: 4 MB or none

• 640 KB Share SRAM

• 64 KB ROM

• eFuse

Security

The BK7236 integrates the IoT Platform Security Suite (IPSS) for cryptograph and system security control. The key features of the IPSS include:

• Secure boot

• Secure debug

• Secure connection

• Firmware Over-The-Air (FOTA)

• Provisioning

• TEE_M

• TrustEngine, which includes the following features:

– Symmetric schemes, AES-ECB/CBC/CTR/CBC-MAC/CMAC/CCM/GCM (key size 128-bit, 192-bit and 256-bit)

– Symmetric schemes, SM4-ECB/CBC/CTR/CBC-MAC/CMAC/CCM/GCM

– Digest schemes, SHA1/224/256

– Digest scheme, SM3

– Asymmetric schemes, RSA 1024/2048/3072/4096 and ECCP 192/224/256/384/512/521

– Asymmetric scheme, SM2

– Key ladder for key management

– Lifecycle management

– True random number generator

Clock Management

• External oscillators: 26 MHz crystal oscillator (XTALH), 32.768 kHz crystal oscillator (XTALL)

• Internal oscillators: 26–360 MHz digitally controlled oscillator (DCO), 32 kHz ring oscillator (ROSC)

• 320/480 MHz PLL (DPLL)

• Audio PLL (APLL)

Power Management

• 2.0 to 4.35 V VBAT supply

• On-chip Power-On Reset (POR) and Brown-Out Detector (BOD)

• Embedded buck (DC-DC) converters and LDO regulators

• Low power consumption:

– Active mode RX: 17.5 mA

– Sleep mode: 43 μA

– Deep sleep mode: 16 μA

– Shutdown mode: 2.5 μA

Peripherals

• 21 GPIOs

• 1x SPI

• 3x UART: 1 with hardware flow control and flash download support

• 1x SDIO

• 1x I2C

• 1x LIN controller

• 2x general-purpose DMA controller (GDMA), each with 8 channels

• 7x 32-bit PWM channel

• 12-bit AUX ADC, up to 7 channels

• 6x 32-bit general-purpose timer

• 2x watchdog timer

• 1x real-time counter (RTC)

• 1x IrDA

• 1x temperature sensor

• 1x touch sensor, 6 touch sensing I/Os

Packaging

• QFN40 package, 5 x 5 mm

• Operating temperature range: -40 to +85 °C

Applications

• Home appliance

– Refrigerator

– Air conditioner

– Thermostat

– Washing machine

– Robot cleaner

• Smart plug

• Smart lighting

– Light bulb

– Light switch

– Ceiling light

– Stand light

• Others

– Remote controller

– Toy

– Drone

– Industrial terminal

– Factory automation sensor/switch

– Smart meter

– Payment terminal

– Industrial computer

– Medical devices

– Kitchen appliances

– Home automation switch/sensor

– Door lock

– Door camera