BK7256，上海博通音视频Wi-Fi6-soc单芯片资源及应用介绍

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The BK7256 is a highly integrated 1x1 single-band 2.4 GHz Wi-Fi 6 (802.11b/g/n/ax) and Bluetooth 5.2 combo solution
designed for applications that require high security and abundant resources. The integration of dual 32-bit RISC-V MCUs
and comprehensive set of peripherals makes the BK7256 ideal for advanced Internet of Things (IoT) applications.
The BK7256 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 BK7256 delivers high integration and
minimal power consumption for central control panels, smart lighting, smart home and other complex IoT applications.
Figure 2-1 shows the general block diagram of BK7256
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 uplink Orthogonal Frequency Division Multiple Access (UL OFDMA)
• Supports individual Target Wake Time (iTWT)
• TX and RX low-density parity check (LDPC) support for extended range
• WPA/WPA2/WPA3-Personal support for enhanced security
• Working mode: STA, AP, Direct
• Concurrent AP + STA
• Integrated Bluetooth/WLAN coexistence (PTA)
• TX power up to +18 dBm
• RX sensitivity -99 dBm
Bluetooth
• Dual-mode Bluetooth 5.2 compliant
• Supports Basic Rate (BR), Enhanced Data Rate (EDR) 2 Mbps and 3 Mbps, Low Energy (LE) 1 Mbps, 2 Mbps, and
long range (125 kbps and 500 kbps)
• Advertising extensions
• Bluetooth direction finding: Angle of Arrival (AoA) and Angle of Departure (AoD)
• Supports an antenna array with up to sixteen antennae for precise indoor positioning
Core and Memory • Dual 32-bit RISC-V MCUs at up to 320 MHz: - Each core features a double-precision floating point unit (FPU)
- Each core has 32 K ITCM + 32K DTCM + 64K ICache + 16K DCache
- Each core includes a memory protection unit (MPU)
- Each core supports DSP instructions
• EEMBC CoreMark® score: 1 core at 320 MHz: 3.57 CoreMark/MHz
• SiP Flash: 4 MB or none
• 8 MB SiP PSRAM
• 512 KB Share SRAM
• 64 KB ROM
• 32-byte eFuse
• 8 Kbit OTP
• JTAG/UART for debug and download
• SPI flash download
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 oscillator: 26 MHz crystal oscillator (X26M), 32.768 kHz crystal oscillator (X32K)
• Internal oscillator: 32 kHz ring oscillator (ROSC), 26 ~ 240 MHz digitally controlled oscillator (DCO) • 320/480 MHz PLL (DPLL)
• Audio PLL (APLL)
Power Management
• 2.7 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: 63 mA
Features
- Active mode TX: 250 mA
- Low voltage standby mode: 150 μA
- Deep sleep mode: 15 μA
- Shutdown mode: 2.0 μAPeripherals • 48 GPIOs
• 2x SPI
• 1x QSPI
• 3x UART: 1 with hardware flow control, 1 with flash download support
• 1x SD/SDIO
• 2x I2C
• 1x full-speed USB OTG (FS)
• 1x CAN controller with CAN FD
• 1x general-purpose DMA controller (GDMA) with 12 channels
• 1x DMA2D controller
• 1x LCD interface (16-bit parallel RGB and I8080)
• 1x JPEG hardware encoder/decoder
• 1x 8-bit CIS DVP camera interface
• Up to 12x 32-bit PWM channels
• 1x I2S
• 2x audio ADC
• 2x audio DAC
• Four-band digital hardware equalizer
• SBC accelerator
• 13-bit SAR ADC, up to 8 channels
• 2x 32-bit general-purpose timer/counter
• 2x watchdog
• 1x real-time counter (RTC)
• 1x IrDA
• 1x temperature sensor
• Up to 16x touch sensing IO
Features
Packaging
• QFN80 package, 8 x 8 mm
• QFN68 package, 8 x 8 mm
• Operating temperature range: -40 up to +125 °C
Applications
• Central control panel
• 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