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As of 2025-07-24

TWELITE Wireless Microcontroller Datasheet

Latest Edition

TWELITE BLUE (Certification Model: TWE-001 Lite) and TWELITE RED (Certification Model: TWELITE RED) are compact modules integrating an ultra-low-power, high-performance microcontroller, flash memory, and a high-performance wireless interface compliant with IEEE802.15.4. The modules operate by connecting power and sensors, and storing programs in the flash memory or EEPROM. They support SPI, I2C, and UART interfaces, enabling connection to various sensors or microcontrollers. Certified for use in Japan, these modules can be incorporated into products immediately.

Features

Compliant with the global IEEE802.15.4 standard
Supports our proprietary protocol stack “TWELITE NET”
Ultra-compact module (13.97 × 13.97 × 2.5 mm)
PCB design maximizes chip performance for stable long-range communication
Equipped with 32KB RAM and 160KB/512KB flash memory, enabling high-performance communication applications
Extremely low standby current of 0.1μA (RAMOFF sleep), extending battery life
Rich I/O including 4 or 6 ADCs, 1 comparator, and 20 general-purpose I/O ports for direct sensor connection
On-board flash memory allows firmware updates
Firmware development supported by free GNU and Eclipse-based environments
Robust 128-bit AES encryption ensures security
Certified under Japan’s ARIB STD-T66 (Technical Conformity), usable without additional license or application
RoHS compliant, meeting new environmental standards

Specifications

Product Variants

TWELITE BLUE and TWELITE RED are available in the variations shown below. Please select the most suitable model for your application.

Sales codes may change over time. Please refer to our website for the latest sales codes.

Common Name	Sales Code	Antenna Terminal	Notes
TWELITE BLUE	TWE-L-WX	Wire antenna terminal type	Antenna not included (reel only)
	TWE-L-U	Coaxial antenna type	Antenna not included
TWELITE RED	MW-R-WX	Wire antenna terminal type	Antenna not included
	MW-R-U	Coaxial antenna type	Antenna not included

Wireless Section

	TWELITE BLUE	TWELITE RED	Notes
Communication Method	2.4GHz IEEE 802.15.4 compliant	2.4GHz IEEE 802.15.4 compliant
Protocol Stack	TWELITE NET and IEEE 802.15.4 MAC	TWELITE NET and IEEE 802.15.4 MAC
Data Rate	Up to 250kbps	Up to 250kbps
Modulation	O-QPSK, DSSS	O-QPSK, DSSS
Number of Channels	16	16	May vary by country
TX Output Power	2.5dBm	9.19dBm	25°C, 3V
RX Sensitivity	-95dBm	-96dBm	25°C, 3V, typ
TX Current	15.3mA	23.3mA	25°C, 3V, typ at max output
		14.0mA	At 3dBm output
RX Current	17.0mA	14.7mA	25°C, 3V, typ

Microcontroller Section

32-bit RISC processor
Variable clock for power optimization
RAM: 32kBytes
EEPROM: 4kBytes
Flash memory: 160kBytes (TWELITE BLUE) / 512kBytes (TWELITE RED)
Watchdog timer, brown-out detection
Fine-grained power control for each block (digital/analog/RAM/wireless)
Built-in AES 128-bit encryption circuit and 16-bit random number generator

Interfaces

	Qty	Notes
ADC	4/6	10-bit. 4 ports for TWELITE BLUE, 6 ports for TWELITE RED
PWM	4
Timer/PWM	1	5 modes including PWM, Δ∑. 16MHz, 16-bit resolution
Pulse Counter	2	Operates in sleep mode. Max 100kHz, 16-bit
UART	2	16550A compatible
SPI Master/Slave	1	3 chip selects, up to 16MHz
Comparator	1
2-wire Serial Master/Slave (I2C, SMBUS compatible)	1	Up to 100kHz or 400kHz, 7/10-bit address modes
General-purpose Digital	20	Shared with other interfaces

Many pins are shared; some combinations may not be available simultaneously.

Certifications and Compliance

	TWELITE BLUE	TWELITE RED
Certification Model	TWE-001 Lite	TWELITE RED
Technical Conformity Number	007-AB0031	007-AF0062
FCC ID	2AINN-L1	-
IC ID	21544-L1	-
Notes	RoHS compliant	RoHS compliant

※1. When using TWELITE outside Japan, there may be restrictions on antennas and other components. Please consult us at the early stage of your development.

※2. Depending on the country, it may be necessary to display the FCC ID or IC ID on TWELITE or your product. If applicable, please contact us.

Export Precautions

The built-in AES 128-bit encryption circuit in TWELITE is subject to export control. We will issue an export control statement as needed; please contact us when exporting.
In some countries, customs clearance may not be possible unless TWELITE has obtained local radio certification. Please inquire about regulations for each export destination.

Product Labeling

The product is marked with a logo, certification numbers, etc., which are subject to change without notice.

Block Diagram

External Dimensions

Dimensions: 13.97 × 13.97 × 2.5 mm Weight: 0.93 g

DXF data for TWELITE BLUE/TWELITE RED outlines is available for download from our website.

Recommended Pad Dimensions

The mating PCB contacting the module’s underside must not have silkscreen or through-holes.
When soldering a wire antenna (such as a matchstick antenna), provide a rectangular hole in the mating PCB and solder from the underside of the module. (See Chapter 7 for details.)
Use a metal mask thickness in the range of t=0.12–0.15mm. Depending on the mask and reflow conditions, solder fillets may not form on one side of the module’s half-through-holes.

Antenna Mounting Opening

When mounting TWELITE on your custom PCB, it is efficient to provide an opening for connecting a wire antenna (matchstick antenna) and solder from the underside.

This drawing shows an example of such an opening.

In this example, pins 29, 30, 31, and 32 (NC, GND, GND, GND) are left unconnected to allow for a larger opening.

Note: Connecting GND pins 28, 30–32 on the SMD version is recommended, but operation without connection is also possible. No significant change in wireless performance has been observed even if left unconnected.

Pin Assignment

Pin Numbers

Pin Assignment

# (Note 1)	IO Name (Note 2)	Function Assignment (Note 3)			Alternate Assignment (Note 4)			Super Easy! Standard App Function Name (Note 5)
1	DO0	SPICLK			PWM2(※6)			PWM2
2	DO1	SPIMISO			PWM3(※6)			PWM3
3	DIO18	SPIMOSI						DO1
4	DIO19	SPISEL0						DO2
5	VCC	VCC						VCC
6	DIO4	CTS0				TIM0OUT	PC0	DO3
7	DIO5	RTS0			PWM1		PC1	PWM1
8	DIO6	TXD0			PWM2			TX
9	DIO7	RXD0			PWM3			RX
10	DIO8	TIM0CK_GT		PC1	PWM4			PWM4
11	DIO9	TIM0CAP	32KTALIN		RXD1			DO4
12	DIO10	TIM0OUT	32KTALOUT					M1
13	DIO12		PWM2		CTS0			DI1
14	DIO14	SIF_CLK		TXD1	TXD0	SPISEL1		SCL
15	DIO13		PWM3		RTS0			DI2
16	DIO11		PWM1		TXD1			DI3
17	DIO15	SIF_D		RXD1	RXD0	SPISEL2		SDA
18	DIO16	COMP1P			SIF_CLk			DI4
19	DIO17	COMP1M	PWM4		SIF_D			BPS
20	GND							GND
21	RESETN	RESETN						RST
22	ADC2	VREF						AI3
23	ADC1							AI1
24	DIO0	SPISEL1	ADC3					AI2
25	DIO1	SPISEL2	ADC4	PC0				AI4
26	DIO2	ADC5(※7)				TIM0CK_GT		M2
27	DIO3	ADC6(※7)				TIM0CAP		M3
28	GND	GND						GND
29	NC	RF						N/A
30	GND	GND						GND
31	GND	GND						GND
32	GND	GND						GND

Note 1. Pin number. Note that the number and assignment may differ from TWELITE DIP. IO name is usually used to identify pins. Note 2. IO name. This is used in semiconductor datasheets, TWELITE app development, and technical support. Note 3. Each pin can be used as simple I/O or analog input, but can also be initialized for other functions via API. The table lists typical functions. Note 4. Alternate functions assignable via API. The table lists typical alternate functions. Note 5. Pin names used by the “Super Easy! Standard App (App_Twelite)”. These are similar to IO names but take care to avoid confusion. Note 6. PWM2,3 can be assigned to DO0,1 by releasing DIO6,7 or DIO12,13 assignments. Note 7. ADC5,6 are available only on TWELITE RED.

Function Reference

Signal Name	Function
PC	Pulse Counter
SPICLK	SPI Master Clock
SPISEL	SPI Select Output
SPIMISO	SPI Master Input
SPIMOSI	SPI Master Output
TIM0CK_GT	Timer Clock, Gate Input
TIM0CAP	Timer Capture Input
TIM0OUT	Timer PWM Output
32KTALIN	Crystal Input
32KTALOUT	Crystal Output
VREF	Reference Voltage
COMP1M	Comparator + Input
COMP1P	Comparator - Input
SIF_D	2-wire Serial Data
SIF_CLK	2-wire Serial Clock
RXD	UART RX
TXD	UART TX
RTS	UART RTS
CTS	UART CTS
PWM	Pulse Width Modulation Output

Special Pin Handling

DO0 (Function: SPICLK)

This pin is used as an output. If an external voltage is applied (even with some output impedance), there have been reports that the TWE module may fail to enter programming mode.
When connecting LEDs or transistors, the pin may enter an intermediate state at startup or wakeup from sleep, possibly causing malfunction. Always use an external circuit that pulls up to Vcc.

DO1 (Function: SPIMISO)

This pin is typically used as an output, but at power-on or reset, it behaves as an input. If a low level is detected at this time, the module boots in programming mode. Pay attention to the voltage at startup on this pin.

DIO0 (Function: ADC3), DIO1 (Function: ADC4)

These pins are shared with analog input. In firmware, the internal pull-up must be disabled when reading AD values .

ADC2

ADC2 can be used as a reference voltage input. Software implementation is required. There is no pin for outputting the reference voltage.

GND

Connecting GND pins 28, 30–32 on the SMD version is recommended, but operation without connection is possible. No significant change in wireless performance has been observed even if left unconnected.

Absolute Maximum Ratings

	Min	Max
Power Supply (VCC)	-0.3	3.6	V
Analog IO (VREF/ADC)	-0.3	VCC+0.3	V
Digital IO	-0.3	VCC+0.3	V

Characteristics

Recommended Operating Conditions

	Symbol	Condition		min	typ	max
Power Supply Voltage	VCC			2.0	3.0	3.6	V
Startup Voltage	Vboot			2.05			V
Operating Temperature	T_OPR	No condensation	TWELITE BLUE	-40	25	105(Note 1) 90(Note 2)	°C
			TWELITE RED	-30	25	90
Operating Humidity	H_OPR	No condensation				85	%RH

*Values are based on semiconductor datasheets.
Note 1: Maximum operating temperature for TWE-L-WX/W0/W7
Note 2: Maximum operating temperature for TWE-L-U

DC Characteristics

	Symbol	Condition		min	typ
Current Consumption	I_CC	Sleep (RAMOFF, no timer)	TWELITE BLUE		0.1	uA
			TWELITE RED		0.1	uA
		Sleep (with timer)	TWELITE BLUE		1.5	uA
			TWELITE RED		1.5	uA
		Tx (CPU doze)	TWELITE BLUE		15.3	mA
			TWELITE RED		23.3	mA
			TWELITE RED (at 3dBm output)		14.0	mA
		Rx (CPU doze)	TWELITE BLUE		17.0	mA
			TWELITE RED		14.7	mA
TX Output Power	Pout		TWELITE BLUE	+0.5	2.5	dBm
			TWELITE RED		9.14	dBm
RX Sensitivity			TWELITE BLUE		-95	dBm
			TWELITE RED		-96	dBm

*Values are based on semiconductor datasheets.

I/O Characteristics

	Symbol	Condition	min	typ	max
DIO Internal Pull-up			40	50	60	kΩ
DIO Hi Input	V_IH		VCCx0.7		VCC	V
DIO Lo Input	V_IL		-0.3		VCCx0.27	V
DIO Input Hysteresis			200	310	400	mV
DIO Hi Output	V_OH	TWELITE BLUE	VCCx0.8		VCC	V
		TWELITE RED	VCC-0.4
DIO Lo Output	V_OL		0		0.4	V
DIO Sink Current	I_OL	VCC 2.7–3.6V		4		mA
		VCC 2.2–2.7V		3		mA
		VCC 2.0–2.2V		2.5		mA

*Values are based on semiconductor datasheets.

ADC Characteristics

	Symbol	Condition	min	typ	max
Reference Voltage	V_REF		1.198	1.235	1.260	V
ADC Resolution					10	Bits
ADC Integral Nonlinearity				±1.6, ±1.8		LSB
ADC Differential Nonlinearity			-0.5		0.5	LSB
ADC Offset Error		0–V_REF		-10		mV
		0–2V_REF		-20
ADC Gain Error		TWELITE BLUE 0–V_REF		+10		mV
		TWELITE BLUE 0–2V_REF		+20
		TWELITE RED 0–V_REF		-10
		TWELITE RED 0–2V_REF		-20
ADC Clock				0.25,0.5, 1.0		MHz
ADC Input Range			0.04		V_REF2xV_REF	V

*Values are based on semiconductor datasheets.

Reel Specifications

Taping Dimensions

Reel Dimensions

Maximum Module Packaging Quantity

Reel/Inner Box	Quantity/Reel	Outer Box	Quantity
1	1000	1	1000

Reflow Conditions

Recommended Reflow Profile

Reflow profile

Preheating	Main Heating	Peak Temp	Number of Reflows
150~~180°C/60~~90sec	220°C/30~45sec	245°C	1 time

Temperature conditions: One reflow within the recommended temperature profile above.
Soldering should be performed by reflow soldering as a general rule.
We have confirmed no issues under the above profile, but please verify solderability under your own manufacturing conditions.

Board Mounting Precautions

Only one reflow process is allowed under our recommended conditions. Note that solder inside the module will re-melt during reflow. Reflow soldering is the principle method.
The product absorbs moisture if left in the natural environment. Mount using reflow within 72 hours after opening.
When storing below the above humidity, ensure proper anti-static measures.
If more than 72 hours have passed after opening, bake under the following conditions before use:
- Do not bake reels directly. Transfer to trays, etc., before baking.
- Baking conditions: 90°C, 48 hours, up to 1 time.
Please note that multiple lot numbers may be mixed in the same package.
Solder fillets are not required on the soldered parts of components mounted on this product.
This product is intended for mounting on glass epoxy PCBs. If mounting on other materials (e.g., ceramics), evaluate thoroughly before use.
Some internal components are highly sensitive to static electricity. Take adequate ESD precautions.
If stress is applied to the shield case, it may detach. Handle with care.
For hand soldering, follow these conditions: below 350°C, within 3 seconds (surface temperature must not exceed 150°C).

Precautions for Use

Factory Default Application

At the time of shipment (as of this datasheet’s publication), TWELITE is programmed with the “Super Easy! Standard App” firmware. This firmware is intended for production testing during manufacturing. We cannot disclose information about the firmware version or contents programmed on TWELITE, even upon request. In the future, the presence or type of pre-installed firmware may be changed without notice. Please write the required application to TWELITE during your own manufacturing process.

Storage

Store in a cool, dry place. Use the product within six months of delivery.

General Notes

Always evaluate and verify our products in your actual usage environment.

If you intend to use this product in applications requiring high reliability or involving human life, please consult your distributor in advance.

Revision History

Version	Date	Revision Details
4.0.2	2024/11/12	Corrected current unit error
4.0.1	2024/07/12	Applied sales code changes; antenna column removed
4.0.0	2024/02/27	Migrated to new website
3.0.4	2019/1/31	Added “Factory Default Application” section
3.0.3	2018/11/05	Corrected section number error in Chapter 8
3.0.2	2018/3/7	Corrected pin function name error in App table
3.0.1	2017/9/1	Corrected TWELITE RED sleep current value
3.0.0	2017/8/1	Initial version