3S Reset & Teardown (FCC ID 2ANDL-TCS905-3S)

Before you buy the Tuya Global 3S, check what's inside.

The TCS905-3S is a low-power Wi-Fi module developed by Tuya, featuring a BK7231NSP chipset. It supports Wi-Fi connectivity and Bluetooth LE, making it suitable for various IoT applications requiring wireless communication and control.

⚠️ NOTE: Ensure correct battery polarity and voltage range (3.0-3.6V) when powering the device.

Quick Specs

Manufacturer: Tuya Global
Model: 3S
Protocol: Wi-Fi, Bluetooth LE
Chipset: Realtek/Beken
Ecosystem: Tuya / Smart Life
App: Smart Life

🔧 Geek Corner (Flashing Info)

Chipset: BK7231NSP
Flashable: ✅ Yes
Info: The BK7231NSP chipset is known to be flashable with custom firmware like Tasmota using appropriate tools.

User Manual

Scanned pages from the official user manual:

3S Manual

External Photos

Photos of the device exterior:

3S Exterior

Verdict

The 3S is a WiFi device from the Tuya / Smart Life ecosystem.

📄 Click to view full text manual (SEO)

TCS905-3S Module Datasheet
Version: 20230117
Online Version
Contents
Contents
1 Product overview 2
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Module interfaces 4
2.1 Dimensions and footprint . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Pin definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Definitions of test points . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Electrical parameters 8
3.1 Absolute electrical parameters . . . . . . . . . . . . . . . . . . . . . 8
3.2 Normal working conditions . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 RF power consumption . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Working current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 RF parameters 12
4.1 Basic RF features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Wi-Fi transmission performance . . . . . . . . . . . . . . . . . . . . . 12
4.3 Wi-Fi receiving performance . . . . . . . . . . . . . . . . . . . . . . . 13
4.4 Bluetooth transmission performance . . . . . . . . . . . . . . . . . . 13
4.5 Bluetooth receiving performance . . . . . . . . . . . . . . . . . . . . 14
5 Antenna information 15
5.1 Antenna type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2 Antenna interference reduction . . . . . . . . . . . . . . . . . . . . . 15
6 Packaging information and production instructions 18
6.1 Mechanical dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2 Production instructions . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.3 Recommended oven temperature curve . . . . . . . . . . . . . . . . . 23
6.4 Storage conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7 MOQ and packaging information 26
8 Appendix: Statement 27
I
Contents
TCS905-3S is an embedded low-power Wi-Fi module that T uya has developed. It
consists of a highly integrated RF chip BK7231NSP and a few peripherals. TCS905-
3S not only supports the Wi-Fi AP and STA modes, but also supports the Bluetooth
LE.
1 / 29
1 Product overview
1 Product overview
TCS905-3S is built in with a 32-bit MCU whose running speed can be up to 120 MHz,
2-MB flash memory, and 256-KB RAM, to support the T uya IoT cloud connection. The
MCU instructions specially extended for signal processing can effectively implement
audio encoding and decoding.
Besides, it has rich peripherals, such as PWM and UART . There are six 32-bit PWM
outputs, making the chip very suitable for high-quality LED control.
1.1 Features
• Built in with the low-power 32-bit CPU, which can also function as an application
processor
• The clock rate: 120 MHz
• Working voltage: 3.0 to 3.6V
• Peripherals: 6 PWMs and 1 UART
• 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...