BK3432 Datasheet

Product overview

The BK3432 chip is a highly integrated Bluetooth 5.0 dual mode data SoC with 2 Mbit/s data rate supported. It integrates a high-performance RF transceiver, baseband, MCU, rich feature peripheral units, programmable protocol and profile to support Bluetooth classic and low energy application. The Flash program memory makes it suitable for customized applications.

The BK3432 is designed with advanced technology process and integrated with switch DCDC regulator, that it has ultra-low power consumption and ultra-low leakage power. The embedded high order interference suppression filter and fast automatic gain control logic make it work well in high interference environment.

The following figure illustrates the BK3432 Block chip:

Features

• Bluetooth® SIG Bluetooth Dual Mode 5.0 compliant
• Low-power 2.4GHz Transceiver
• MCU integrated
• 160 KB programmable Flash for Program and 20 KB RAM for Data
• Program code read protection
• Operation voltage from 0.9 V to 3.6 V
• Clock:
  • 16 MHz crystal reference clock
  • 64 MHz digital PLL clock
  • 32 kHz ring oscillator
  • External 32 kHz crystal oscillator
  • MCU can run with any clock source with internal frequency divider
• Interface and peripheral units:
  • JTAG, I2C, SPI interface
  • Two UART interface
  • Multi-channels PWM output
  • On-chip 10 bit general ADC
  • GPIO with multiplexed interface functions
  • True random number generator
• Typical package type:
  • 32-pin QFN 4x4

PIN information

QFN32

The following figure illustrates the BK3432 QFN32 pin assignment.

The following table describes the BK3432 QFN32 pins.

Functional description

GPIO

The BK3432 QFN32 has totally 20 GPIO pins, which can be configured as either input or output. There are secondary functions available for GPIO pins and configurable by firmware.

At the beginning of the chip starts up, the chip will enter programming mode, JTAG mode or normal according received command from Mode Selecting Pin.

The following table describes the BK3432 GPIO function mapping.

Each GPIO pin can be the source to wake up MCU from shut down state. In the shutdown state, any voltage level change on the pre-configured GPIO pin will trigger the wake-up procedure.

Timers

• PWM timers

  There are six 16 bits PWM timers. The clock of PWM timers can be selected as 32 KHz clock or 16 MHz clock by register.

  There are two modes of PWM timers. One is timer mode and another is PWM mode. The timer mode can generate interrupt to MCU. The PWM mode can generate PWM waveform and output to GPIO pins to drive external device such as LED. Six GPIO pins can be used to output PWM waveform separately.

• Watch dog timer and RTC timer

  The watch dog timer and RTC timer run on the always on power domain, whose clock source is 32 kHz clock.

  The 16 bits watch dog timer runs with 4 kHz frequency that its period can be up to 16 second. After watch dog timer is expired, it will reset the whole chip.

  The 32 bits RTC timer in always on power domain run with ROSC frequency that its period can be up to one day. After RTC timer is expired, it will wake up the MCU.

ADC

A 10-bit generic ADC is integrated in BK3432. Total five external channels and one internal channel can be selected for ADC transfer. It supports both single and continuous mode.

UART, I2C, and SPI

There are two set UARTs, one set I2C and one set SPI interface, which support both master and slave mode.

The UART baud rate can be up to 3.2 MHz, and the SPI clock speed can be up to 4 MHz。

Security

There is a true random number generator to make system get better security communication.

The FLASH content will be protected (not readable, but erasable) as long as the LSB bit 3 or bit 5 of the last 32-bit word of last address 0x9FFF is set to zero.

Electrical specifications

The following table describes the BK3432 RF characteristics:

Package information

The BK3432 32-Pin uses the 4mmx4mm QFN package.

Order information

Revision history