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Overview

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The BK7235 is a highly integrated 1x1 single-band 2.4 GHz Wi-Fi 6 (802.11b/g/n/ax) and Bluetooth 5.2 Low Energy (LE) combo solution designed for applications that require high security and abundant resources. The integration of a 32-bit RISC-V MCU and a comprehensive set of peripherals makes the BK7235 ideal for advanced Internet of Things (IoT) applications.

The BK7235 provides state-of-the-art security based on a powerful security architecture. It offers an isolated and immutable platform root of trust to provide security services, such as secure boot and cryptographic operations, to applications running on a non-secure processing environment.

Using advanced design techniques and ultra-low power process technology, the BK7235 delivers high integration and minimal power consumption for smart lighting, smart home, and other advanced IoT applications.

Features

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Wi-Fi

• IEEE 802.11b/g/n/ax 1x1 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 +20 dBm

• RX sensitivity -99 dBm

Bluetooth Low Energy

• Bluetooth Low Energy (LE) 5.2

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

• Supported Bluetooth Low Energy features: LE audio, 2 Mbps, advertising extensions, and long range

Core

• 32-bit RISC-V MCU at up to 320 MHz:

- 32 KB ITCM + 32 KB DTCM

- 5-stage in-order execution pipeline

- Hardware multiplier and divider

- Branch prediction

- Machine (M) and User (U) Privilege levels

- Performance monitors

- Misaligned memory accesses

- Physical Memory Protection (PMP), 8 regions

- RISC-V RV32I base integer instruction set

- RISC-V “M” standard extension for integer multiplication and division

- RISC-V “A” standard extension for atomic instructions

- RISC-V “F” standard extensions for single-precision floating-point

- RISC-V “C” standard extension for compressed instructions

- DSP extension

- RISC-V “N” standard extension for user-level interrupt and exception handling

- Performance extension

- CoDense extension

- 3.57 CoreMark/MHz, 1.98 DMIPS/MHz

• UART flash download

• Serial Wire Debug (SWD) interface

Memory

• 4 MB SiP flash

• SiP PSRAM: 4 MB or none

• 512 KB Share SRAM

• 64 KB ROM

• eFuse

Security

• Isolated secure element (FIPS 140-2 Level 2 certified) with hardware cryptography

• Secure boot

• Unique ID and secure storage

• Secure update and anti-rollback

• Lifecycle management such as secure debug

• Flash encryption

• Cryptographic hardware acceleration:

- Crypto accelerator: DES, AES-128/192/256, ChaCha20-128/256, SM4-128

- Public key accelerator: ECDSA-P256/P384, RSA-2048/3072, SM2

- Hash: SHA-224/256, SHA-384/512, HMAC, Poly1305, SM3-512

- True Random Number Generator (TRNG)

• Key Derivation Function (KDF)

Clock Management

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

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

• 320/480 MHz PLL (DPLL)

• Audio PLL (APLL)

Power Management

• 2.8 to 5.0 V VBAT supply

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

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

• Low power consumption:

- Active mode RX: 85 mA

- Active mode TX @ 17 dBm: 230 mA

- Sleep mode: 238 μA

- Deep sleep mode: 16 μA

- Shutdown mode: 3.4 μA

Peripherals

• 26 GPIOs

• 1x SPI

• 2x UART: 1 with flash download support

• 1x I2C

• 1x CAN controller with CAN FD

• 1x general-purpose DMA controller (GDMA) with 12 channels

• 1x JPEG hardware encoder

• 1x JPEG hardware decoder

• 1x 8-bit CIS DVP interface

• 10x 32-bit PWM channel

• 13-bit AUX ADC, up to 5 channels

• 6x 32-bit general-purpose timer

• 2x watchdog timer (WDT)

• 1x real-time counter (RTC)

• 1x IrDA

• 1x temperature sensor

• 1x touch sensor, up to 14 touch sensing I/Os

Packaging

• QFN40 package, 5 x 5 mm

• Operating temperature range: -40 to +105 °C

Applications

• Home appliance

- Refrigerator

- Air conditioner

- Thermostat

- Washing machine

- Robot cleaner

• Smart plug

• Smart lighting

- Light bulb

- Light switch

- Ceiling light

- Stand light