MNU107 MEMS Inertial Measurement Unit

 

 

 

• High-overload missile-borne application
• Flight control

 

 

MNU107 is a highly reliable and cost-effective three-axis MEMS inertial sensor, which can be widely used in navigation, control, and measurement fields represented by inertial navigation.

MNU107 integrates high-performance MEMS gyroscopes and MEMS accelerometers. The system internally performs compensation for bias, Scale Factor, non-orthogonality errors, and acceleration-related terms across full temperature parameters, maintaining high measurement accuracy over extended periods.

adopts strict processes to ensure the reliability and consistency of product performance.

 

 

MEMS Gyroscope
Range (°/s)	X-axis: ±5400°/s ,Y/Z-axis: ±500°/s
Bias @ Full temp. (°/s, 3σ)	≤360
Bias Stability (°/h, 10s smoothing)	≤20
Bias Repeatability (°/h)	≤20
Bias Instability (°/h, Allan, typ)	≤5
Angular Random Walk (°/√h)	≤0.8
Scale Factor Nonlinearity (ppm)	≤100
Cross-Coupling (rad)	≤0.001
Bandwidth (Hz)	≥200Hz
MEMS Accelerometer
Range (g)	±20
Bias @ Full temp. (mg, 3σ)	≤20
Bias Stability (μg, 10s smoothing)	≤500
Bias Instability (μg, Allan, typ)	≤100
Bias Repeatability (μg)	≤500
Velocity Random Walk (m/s/√h)	≤0.06
Scale Factor Nonlinearity (ppm, ±1g)	≤300
Cross-Coupling (rad)	≤0.001
Bandwidth (Hz)	≥200Hz
Electrical/Mechanical Interface
Power Supply (V)	5±0.2
Power (W)	≤1
Startup Time (s)	≤2
Communication interface	RS-422
Update Rate (Hz)	1000
Dimensions (mm×mm×mm)	Ф55 × 15
Weight (g)	≤60
Operating Environment
Operating Temp. (°C)	-40~80
Storage Temp. (°C)	-55~85
Vibration (g, Rms)	6.06,20~2000Hz
Shock (g)	15000/10ms

 

 

Product Overview

Key Features

• Multi-sensor redundancy and fault tolerance design
• High performance, compact size, lightweight, low power consumption
• Full temperature calibration and compensation from -40 ℃ to +80 ℃
• 1k Hz high-speed sampling
• Harsh mechanical environment resistance
• Software online upgrade capability

 

Applications

• High-overload missile-borne application
• Flight Control

 

 

 

 

Mechanical Characteristics

MNU107 MEMS inertial measurement unit adopts high-strength aerospace aluminum alloy structure,structural integrity, providing high vibration and shock resistance The module adopts 4*M3 screw mounted. It's mechanical dimensions are shown in Figure 1:

Figure 1 Mechanical Dimensions

 

Product Marking and Orientation

Product installation must ensure a fixed relationship between the product body coordinate system and the body coordinate system of the application object. The body coordinate system of the MEMS Inertial Measurement Unit is defined as follows：

 

Interface Definition

The MEMS Inertial Measurement Unit provides one RS422 interface output, with functions distinguished by color-coded wires. The cable harness length is no less than 100mm, and the wire diameter is no less than 0.07mm2. The electrical interface is as follows:

Table 2 MNU107 Inertial Measurement Unit (IMU)Connector Pin Definition

Pin No.	Color	Definition	Remarks
1	Yellow	R422A_R+	Communication
2	Green	R422A_R-
3	Purple	R422A_T+
4	Orange	R422A_T-
5	Red	+5V	Power Supply
6	Black	GND

 

Communication Protocol

3.4.1 XDIMU-55AAProtocol

The XDIMU-55AA protocol features40 bytes per data frame,with periodic broadcast output, default output frequency1000Hz, default baud rate921600bps. The baud rate and output frequency of the communication protocol can be configured via the host computer. The data frame format is: 1 start bit, 8 data bits, 1 stop bit, no parity bit, little-endian byte order (low byte first, high byte second) (Little-Endian Mode, Intel Mode)

Table 3 MNU107 MEMS Inertial Measurement UnitXDIMU-55AAFormat

Pin No.	Definition	Remarks
1	Frame Header	55H
2	Frame Header	AAH
3	Data Length	N-4
4～N-1	Data
N	Checksum	checksum
Note: The checksum is the lower 8 bits of the cumulative sum of the data length and all bytes in the data packet.

 

Table 4 MNU107 MEMS Inertial Measurement UnitXDIMU-55AACommunication Content

No.	Byte Start	Byte Count	Data Type	Content	Equivalent	Range	Unit	Remarks
1	0	1	UINT8	0x55	1			Frame Header
2	1	1	UINT8	0xAA	1			Frame Header
3	2	1	UINT8	36	1			Data Length
4	3	4	UINT32	PCnum	1			1ms Counter Value
5	7	4	INT32	Angular Rate X	0.000003	[-6000,6000]	°/s
6	11	4	INT32	Angular Rate Y	0.000003	[-6000,6000]	°/s
7	15	4	INT32	Angular Rate Z	0.000003	[-6000,6000]	°/s
8	19	4	INT32	Acceleration X	0.000001	[-40g,40g]	m/s2
9	23	4	INT32	Acceleration Y	0.000001	[-40g,40g]	m/s2
10	27	4	INT32	Acceleration Z	0.000001	[-40g,40g]	m/s2
11	31	2	short	System Temperature	0.008	[-120,120]	℃
12	33	2	short	Geomagnetic X	1		LSB
13	35	2	short	Geomagnetic Y	1		LSB
14	37	2	short	Geomagnetic Z	1		LSB
15	39	1	UINT8	Checksum	1	[0,255]		Lower 8 bits of byte cumulative sum (index 2 to 38)

 

Precautions

• Pay attention to the product electrical interface definition. During use, strictly follow the terminal pin configuration to avoid incorrect connections;
• The product is a precision measurement device. During handling, avoid subjecting it to shock, collision, or other conditions exceeding the product's tolerance range;
• Product installation significantly affects angular velocity measurement. To avoid introducing mounting errors, the mounting surface must have good flatness;
• To ensure measurement accuracy, the product must be mounted securely and firmly to avoid measurement errors caused by loosening;
• During product installation and use, ESD (Electrostatic Discharge) protection should be observed. It is recommended to wear an ESD wrist strap;
• Please strictly follow the requirements of this manual for operation. Ensure that the external environment matches the usage requirements. In case of issues, do not open the product cover or modify the internal structure. If any problems arise, please contact our technical support team in a timely manner

 

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