CB3S Wi-Fi Module
by Tuya Inc.
| Parameter | Value |
|---|---|
| Board code | cb3s |
| MCU | BK7231N |
| Manufacturer | Beken |
| Series | BK72XX |
| Frequency | 120 MHz |
| Flash size | 2 MiB |
| RAM size | 256 KiB |
| Voltage | 3.0V - 3.6V |
| I/O | 14x GPIO, 6x PWM, 2x UART, 1x ADC |
| Wi-Fi | 802.11 b/g/n |
| Bluetooth | BLE v5.1 |
| FCC ID | 2ANDL-CB3S |
Usage
Board code: cb3s
In platformio.ini:
In ESPHome YAML:
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 | |||||
| P20 | SCL1 | TCK | |||
| P21 | SDA1 | TMS | |||
| P22 | TDI | ||||
| P23, ADC3 | TDO | ||||
| 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.