Overview

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The BK7238 is a highly-integrated single-chip Wi-Fi 802.11n and Bluetooth Low Energy (LE) 5.2 combo solution designed for applications that require low power and compact size. The integration of a powerful 32-bit MCU and comprehensive set of peripherals and interfaces makes the BK7238 ideal for advanced Internet of Things (IoT) applications.

Using advanced design techniques and process technology, the BK7238 delivers high integration and minimal power consumption in an extremely small package for smart lighting, smart home, indoor positioning, and other complex IoT applications.

Features

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Wi-Fi
• IEEE 802.11 b/g/n 1x1 compliant
• Supports 20 MHz channel
• STBC supported
• Working mode STA, AP, Direct
• Concurrent AP + STA
• TX power up to +19 dBm
• RX sensitivity -99 dBm

Bluetooth Low Energy
• Bluetooth 5.2
• Bluetooth 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
• Integrated Bluetooth LE/WLAN coexistence (PTA)

Core and Memory
• 32-bit MCU at up to 160 MHz
• SiP Flash options: 1 MB, 2 MB or none (depending on package)
• 288 KB RAM
• 4-byte eFuse
• UART/JTAG for download and debug

Clock Management
• External oscillator: 26 MHz crystal oscillator (X26M)
• Internal oscillator: 26 ~ 160 MHz digitally controlled oscillator (DCO), 32 kHz ring oscillator (ROSC)
• 480 MHz DPLL

Power Management
• 2.7 to 3.6 V VBAT supply
• On-chip power-on reset (POR) and brown-out detector (BOD)
• Embedded LDO regulators
• Low power consumption:
- Active mode RX: 30 mA
- Normal standby mode: 300 μA
- Low voltage standby mode: 75 μA
- Shutdown mode: 0.5 μA

Peripherals
• GPIOs: 19 in QFN32 (BK7238QN40), 19 in QFN32 (BK7238QN32), 9 in QFN20 (BK7238QN20)
• 1x SPI
• 2x UART: 1 with Flash download support
• 1x I2C
• 1x general-purpose DMA controller (GDMA) with 6 channels
• 6x 32-bit PWM
• 10-bit SAR ADC, up to 6 channels
• 6x general-purpose 32-bit timer/counter
• 1x watchdog timer
• 1x real-time counter (RTC)
• 1x temperature sensor
• 1x true random number generator (TRNG)

Packaging
• QFN40 package, 5 x 5 mm
• QFN32 package, 4 x 4 mm
• QFN20 package, 3 x 3 mm
• Operating temperature range: -40 to +105°C