CR3L Reset & Teardown (FCC ID 2ANDL-CR3L)

Before you buy the Tuya Global CR3L, check what's inside.

The CR3L is a low-power dual-mode module supporting both WiFi and Bluetooth Low Energy (BLE) connectivity. It is designed for embedded applications requiring network connectivity, powered by a single MCU and integrated RF chip.

⚠️ NOTE: Ensure correct battery polarity and voltage when powering the module.

Quick Specs

Manufacturer: Tuya Global
Model: CR3L
Protocol: WiFi+BLE
Chipset: Realtek RTL8720
Ecosystem: Tuya / Smart Life
App: Smart Life

🔧 Geek Corner (Flashing Info)

Chipset: RTL8720CM
Flashable: ❌ No
Info: The datasheet indicates proprietary firmware and RTOS, and the 'flashable' field in the original metadata is false. While the RTL8720CM chipset is not inherently unflashable, Tasmota support is unlikely without specific community efforts or custom firmware.

User Manual

Scanned pages from the official user manual:

CR3L Manual

External Photos

Photos of the device exterior:

CR3L Exterior

Internal Photos

Teardown photos showing the PCB and components:

CR3L PCB

Verdict

The CR3L is a WiFi device from the Tuya / Smart Life ecosystem.

📄 Click to view full text manual (SEO)

CR3L Module Datasheet
Hardware Product Development > Network Modules > Wi-Fi & BLE
Dual Mode Module
Version: 20201208
Online Version
Contents
Contents
1 Product overview 2
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Change history 3
3 Module interfaces 3
3.1 Dimensions and footprint . . . . . . . . . . . . . . . . . . . . . . . . 3
3.2 Pin deﬁnition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical parameters 8
4.1 Absolute electrical parameters . . . . . . . . . . . . . . . . . . . . . 8
4.2 Working conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.3 RF power consumption . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.4 Working power consumption . . . . . . . . . . . . . . . . . . . . . . . 10
5 RF parameters 11
5.1 Basic RF features . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 TX performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3 RX performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Antenna 14
6.1 Antenna type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.2 Antenna interference reduction . . . . . . . . . . . . . . . . . . . . . 14
7 Power-on sequence and resetting 15
7.1 Power-on sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2 Resetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Packaging information and production instructions 17
8.1 Mechanical dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.2 Recommended PCB layout . . . . . . . . . . . . . . . . . . . . . . . . 18
8.3 Pin header speciﬁcations . . . . . . . . . . . . . . . . . . . . . . . . 19
8.4 Production instructions . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.5 Recommended oven temperature curve . . . . . . . . . . . . . . . . . 22
i
Contents
8.6 Storage conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9 MOQ and packaging information 24
10 Appendix: Statement 24
ii
Contents
CR3L is a low-power embedded WiFi+BLE module that T uya has developed. It con-
sists of a highly integrated wireless RF chip (RTL8720CM), with an embedded WiFi
network protocol stack and varied library functions.
1 / 26
1 PRODUCT OVERVIEW
1 Product overview
With the maximum CPU clock rate of 100MHz, CR3L also contains a low-power KM4
microcontroller unit (MCU), a WLAN MAC, a 1T1R WLAN module, 4-MB static random-
access memory (SRAM), 4-MB ﬂash memory, and extensive peripherals. CR3L is
an RTOS platform that integrates all function libraries of the WiFi MAC and TCP/IP
protocols. Y ou can develop embedded WiFi products as required.
1.1 Features
• Embedded low-power KM4 MCU, which can also function as an application pro-
cessor; Clock rate: 100MHz
• Working voltage: 3.0 to 3.6 V
• Peripherals: 9 GPIOs, 1 universal asynchronous receiver/transmitter (UART),
and 1 log tr...