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Overview

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The BK5881 is a highly-integrated single-chip ETC + Bluetooth 5.2 (BR/LE) combo system-on-chip (SoC). It integrates a high-performance 5.8 GHz ETC transceiver, a 2.4 GHz Bluetooth transceiver, a feature-rich baseband processor, a memory controller, multiple analog and digital peripherals, as well as Bluetooth and 2.4 GHz proprietary protocol stacks.
The 5.8 GHz transceiver is optimized for use in ETC with ASK modulation and demodulation. It complies with China's electronic toll collection (ETC) standard, GB/T 20851.1 and GB/T 20851.2.
Using advanced design techniques and ultra-low-power process technology, the BK5881 delivers high integration and minimal power consumption for ETC applications.

Features

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5.8 GHz ETC Transceiver
• Frequency range: 5.77 GHz - 5.85 GHz
• Uplink 512 kbps/256 kbps
• Downlink 256 kbps/512 kbps
• TX power up to 10 dBm
• RX sensitivity: -85 dBm @ 33 mA, -81 dBm @ 27 mA, -65 dBm @ 25 mA
• Wakeup sensitivity: -63 dBm with external diode
• 4 μA/2.5 μA current consumption at -54 dBm/-51 dBm wakeup sensitivity without external diode
• 20 dB tuning range and 1 dB tuning resolution for wakeup sensitivity
• Wakeup via 14 kHz waveform or 0x7E
• Fast AGC to accommodate up to 85 dB dynamic range RF input
• Capable of receiving the 1st BST without MCU control
• The sending CRC seed can be set automatically according to the received CRC seed.
• 65 mA TX mode current
• 23 mA RX mode current at -65 dBm sensitivity

Bluetooth + 2.4 GHz Proprietary
• Bluetooth 5.2 and 2.4 GHz proprietary
• Supports Basic Rate (BR), Low Energy (LE) 1 Mbps, 2 Mbps and long range (125 kbps and 500 kbps)
• Supports 2.4 GHz proprietary 1 Mbps, 2 Mbps and 250 kbps
• TX power up to +10 dBm
• RX sensitivity -95 dBm
• Active mode TX 0 dBm, buck mode: 6.1 mA
• Active mode RX, buck mode: 5.5 mA
• 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
• 32-bit RISC MCU at up to 64 MHz
• Embedded 512 KB Flash with ECC (Error Correction Code) and read out protection
• 64 KB RAM
• 8 KB Cache
• UART/JTAG for debugging and downloading

Clock Management
• External oscillators: 16 MHz crystal oscillator (X16M), 32.768 MHz crystal oscillator (X32M)
• Internal oscillator: 32 kHz ring oscillator (ROSC)
• 64 MHz PLL

Power Management
• 1.8 to 3.6 V VCCBAT supply
• On-chip power-on reset (POR) and brown-out detector (BOD)
• Embedded DC-DC converter (buck mode) and LDO regulators
• Low power consumption:
- Deep sleep, buck mode: 1.2 μA
- Low voltage standby, buck mode: 3.2 μA
- Normal standby, buck mode: 8.0 μA

Peripherals
• 25 GPIOs
• 2x SPI
• 3x UART: 1 with flash download support, 2 with 7816 protocol support
• 1x I2C
• 1x CAN2.0B/CAN FD
• 1x general-purpose DMA controller (GDMA) with 6 channels
• 6x 32-bit PWM
• 12-bit SAR ADC, 3 channels
• 6x general-purpose 32-bit timer/counter
• 2x watchdog timer
• 1x real-time counter (RTC)
• 1x IrDA interface
• 1x temperature sensor
• 1x true random number generator (TRNG)

Packaging
• QFN48 package, 6 x 6 mm
• Operating temperature range: -40 to +105°C