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CB3L Wi-Fi Module

by Tuya Inc.

Product page

Parameter Value
Board code cb3l
MCU BK7231N
Manufacturer Beken
Series BK72XX
Frequency 120 MHz
Flash size 2 MiB
RAM size 256 KiB
Voltage 3.0V - 3.6V
I/O 12x GPIO, 6x PWM, 2x UART, 1x ADC
Wi-Fi 802.11 b/g/n
Bluetooth BLE v5.1
FCC ID 2ANDL-CB3L

Usage

Board code: cb3l

In platformio.ini:

[env:cb3l]
platform = libretiny
board = cb3l
framework = arduino

In ESPHome YAML:

bk72xx:
  board: cb3l

Pinout

Pinout

Pin functions

Name(s) UART IĀ²C SPI PWM Other
P0 TX2
P6 PWM0
P7 PWM1
P8 PWM2
P9 PWM3
P10 RX1
P11 TX1
P14
P21
P23, ADC3
P24 PWM4
P26 PWM5

Flash memory map

Flash size: 2 MiB / 2,097,152 B / 0x200000

Hex values are in bytes.

Name Start Length End
Bootloader 0x000000 68 KiB / 0x11000 0x011000
App Image 0x011000 1.1 MiB / 0x119000 0x12A000
OTA Image 0x12A000 664 KiB / 0xA6000 0x1D0000
Calibration 0x1D0000 4 KiB / 0x1000 0x1D1000
Network Data 0x1D1000 4 KiB / 0x1000 0x1D2000
TLV Store 0x1D2000 4 KiB / 0x1000 0x1D3000
Key-Value Store 0x1D3000 32 KiB / 0x8000 0x1DB000
User Data 0x1DB000 148 KiB / 0x25000 0x200000
Tuya Storage 0x1ED000 76 KiB / 0x13000 0x200000

Bootloader and app partitions contain CRC16 sums every 32 bytes. That results in the actual flash offsets/sizes not aligned to sector boundaries. To simplify calculations, the values shown in the table (extracted from bootloader's partition table) were aligned to 4096 bytes.