1. Resource Preview

1.1 characteristic

• bluetooth 5.2 Dual mode and proprietary 2.4 GHz agreement
• About... At full speed 5mA
• Deep sleep is about 1uA, At the same time, it can run low-power timer
• bluetooth 5.1 Standard arrival angle and departure angle
• Up to sixteen antenna matrices , Accurate indoor positioning can be realized
• Low power Bluetooth 125 kbps、500kbps、1Mbps and 2Mbps
• Classic Bluetooth 1 Mbps
• proper 2.4 GHz 1Mbps and 2Mbps
• the height is 12 dBm High output power and Bluetooth LE Power control
• 32 position RISC kernel , have 80KB Data storage and up to 80 MHz The speed of
• 500 KB FLASH
• The operating voltage range is 0.9 ~1.5V(boost) ,2.0~3.6V(buck)
• The clock
  • With internal tuning load capacitance 16 MHz Crystal reference clock
  • 80mhz Digital PLL clock
  • 32 kHz Ring oscillator
  • external 32KHz Crystal oscillator
  • Single chip microcomputer can run in any clock source with internal frequency divider
  • I2S Master clock dedicated audio PLL clock
• Interfaces and peripherals
  • 4 Line FLASH Programming
  • I2C, SPI The interface can reach 96 Mhz
  • Two UART Interface and UART download
  • Multi channel high resolution 32 position PWM Capture
  • USB Host and device interfaces , have USB Audio function
  • IrDA Receiver and transmitter amplification
  • On chip high precision temperature sensor
  • On film 10 Bit Universal ADC
  • With multi-channel interface function GPIO
  • True random number generator
  • I2S/PCM Digital audio interface , With master-slave mode
  • The high quality 、 High speed 、 Low power clock output
  • Code encryption and online decryption
  • Safe JTAG And system protection

1.2 Pin

Yes 3 Kind of package ： Namely 32PIN,40PIN,48PIN.

2 Function description

2.1 GPIO

BK3633 Yes 32 individual GPIO, Each can be configured as an input or output . In addition, the second function can be configured through firmware , Here's the picture ：


Every GPIO Both pins can be used in the shutdown state MCU Wake up source , In the off state , Preconfigured GPIO Any level change on the pin will trigger the wake-up program .

2.2 Timer

2.2.1 PWM Timer

BK3633 use 6 road 32 position PWM Timer , The clock frequency can be configured through registers 32KHz or 16MHz.
PWM The timer has the following 4 Patterns ：

1. timer mode ： Can trigger MCU interrupt .
2. PWM Pattern ： stay GPIO In the middle of PWM wave form , Can be used to drive peripherals, such as LED,6 road PWM It can be configured separately .
3. Capture mode ： On the specified pin , The clock cycle between the combination of rising and falling edges of the signal can be calculated .
4. Pulse mode ： The number of active high pulses and active low pulses can be calculated .

2.2.2 Watchdog timer and RTC Timer

These two timers always run , The clock source is 32 kHz.
16 Bit watchdog timer to 4KHz Frequency operation of , Its cycle can reach 16 second （2^16/4000 = 16.384 s）. When the watchdog timer expires , The system will restart .
RTC Timer to ROSC Frequency operation , The cycle can be up to one day , It will wake up after expiration MCU.

2.2.3 Sub microsecond event timer

A sub microsecond resolution timer . For example, when the first bit of the Bluetooth transmitter packet or the receiver synchronization word is matched , At the same time, you can specify a time after a certain GPIO The interrupt .

2.3 ADC

ADC The accuracy is 10 Bit , in total 6 Road external access and 2 Inside the road . Support single mode and continuous mode .

2.4 UART、I2C and SPI

Yes 2 Group UART,1 Group I2C and 1 Group SPI Interface , It also supports master-slave mode .UART Baud rate up to 3.2MHz,SPI The clock speed can reach 96MHz.

2.5 USB

Integrated USB Host and device transceivers and baseband .
USB Interface support EP0 To EP8：

• EP0 Two way support 64 Bytes FIFO
• EP1 ~ EP4 Support two-way 256 Bytes FIFO
• EP5 ~ EP8 Support one-way 64 Bytes FIFO

2.6 True random number generator

Using the variation characteristics of device noise , A bit true random number generator is provided .

2.7 I2S Audio digital interface

I2S Interface mapping in GPIO[25, 26, 27, 30], Support 8KHz ~ 96KHz Adjustable sampling rate , If the operation is in host mode ,GPIO33 It can be used as the master clock .
I2S Interface support PCM Mono mode and I2S Stereo channel mode . The data width can be 16、24 and 32 position .

2.8 Code encryption and system security

Double NVM Used for code encryption and system security . Each unit can have different passwords for code encryption , The hardware will automatically decrypt .
The download debugging interface can be permanently closed by the user , To keep the system safe .
Users can also NVM For other purposes , If only ID or MAC Address . For code encryption NVM You can turn off read and write operations , Other spaces can be closed for write operations . Once the access rights are changed , It is impossible to roll back to provide permanent security of the system .

2.9 Arrival angle and departure angle

It supports up to 16 Angle estimation of an antenna array . whatever GPIO Can be configured as antenna switch control pin .

3 Power specification

3.1 DC characteristics

3.2 RF characteristic

3.3 ADC characteristic