U Reset & Teardown (FCC ID 2ANDL-TCS905-U)

Before you buy the Tuya Global U, check what's inside.

The Tuya TCS905-U is a low-power embedded module featuring Wi-Fi and Bluetooth LE connectivity, powered by the BK7231N chipset. It is designed for various IoT applications requiring efficient connectivity and processing, such as smart LED control.

⚠️ NOTE: Ensure correct battery polarity.

Quick Specs

Manufacturer: Tuya Global
Model: U
Protocol: WiFi
Chipset: Realtek/Beken
Ecosystem: Tuya / Smart Life
App: Smart Life

🔧 Geek Corner (Flashing Info)

Chipset: BK7231N
Flashable: ✅ Yes
Info: The BK7231N chipset is known to be flashable with custom firmware like Tasmota.

User Manual

Scanned pages from the official user manual:

U Manual

External Photos

Photos of the device exterior:

U Exterior

Verdict

The U is a WiFi device from the Tuya / Smart Life ecosystem.

📄 Click to view full text manual (SEO)

TCS905-U Module Datasheet
Version: 20230117
Online Version
Contents
Contents
1 Overview 2
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Module interfaces 4
2.1 Dimensions and package . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Pin definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical parameters 9
3.1 Absolute electrical parameters . . . . . . . . . . . . . . . . . . . . . 9
3.2 Normal working conditions . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 RF power consumption . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Operating current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 RF parameters 13
4.1 Basic RF features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Wi-Fi transmission performance . . . . . . . . . . . . . . . . . . . . . 13
4.3 Wi-Fi receiving performance . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Bluetooth LE transmission performance . . . . . . . . . . . . . . . . . 14
4.5 Bluetooth LE receiving performance . . . . . . . . . . . . . . . . . . . 15
5 Antenna information 16
5.1 Antenna type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Antenna interference reduction . . . . . . . . . . . . . . . . . . . . . 16
6 Packaging information and production instructions 17
6.1 Mechanical dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2 Production instructions . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.3 Recommended oven temperature curve . . . . . . . . . . . . . . . . . 22
6.4 Storage conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7 MOQ and packaging information 26
8 Appendix: Statement 27
I
Contents
TCS905-U is a low-power embedded Wi-Fi module that T uya has developed. It con-
sists of a highly integrated RF chip BK7231N and a few peripherals, and not only
supports the AP and STA dual-network-connection manner but supports the Blue-
tooth LE network connection manner.
1 / 29
1 Overview
1 Overview
TCS905-U is built-in with a 32-bit MCU with a running speed of up to 120 MHz, 2Mbyte
flash, and 256-KB RAM, so as to support the T uya IoT cloud connection. The MCU ’
s specially extended instructions for processing signals can effectively implement
audio encoding and decoding. Besides, it has rich peripherals, such as PWM, UART,
and SPI. The five 32-bit PWM output makes the chip very suitable for high-quality
LED control.
1.1 Features
• Embedded low-power 32-bit CPU, which can also function as an application
processor
• The clock rate: 120 MHz
• Operating voltage: 3.0V to 3.6V
• Peripherals: 5 PWMs, 2 UART s, and 1 SPI
• Wi-Fi connectivity
– 802.11 b/g/n
– Channels 1 to [email protected] GHz
– Support WEP, WPA/WPA2, WPA/WPA2 PSK (AES), WPA3 security modes
– Up to + 16 dBm output power in 802.11b mode
– Support STA/AP/STA+AP working mode
– Support SmartConfig and AP net...