LP-RESEARCH LPMS-B2 User manual

LPMS-B2 Series
Hardware Manual ver. 1.0
LP-RESEARCH Inc.
http://www.lp-research.com

Version History
Date
Revision
Changes
2020-03-10
1.0
- Initial release.
- Contents extracted from quick start guide.

Table of Contents
1. Introduction....................................................................... - 1 -
2. System Overview.............................................................. - 2 -
3. Coordinate ........................................................................ - 3 -
4. Specification..................................................................... - 4 -
5. Battery Charging .............................................................. - 7 -
Charging........................................................................................- 7 -
LED Indication...............................................................................- 7 -
6. Mechanical Information.................................................... - 8 -

LPMS-B2 Series Hardware Manual ver. 1.0
- 1 -
1. Introduction
Welcome to the LP-RESEARCH Motion Sensor LPMS-B2 Series hardware manual.
In this documentation we will primarily introduce the hardware specifications of
LPMS-B2 Series sensors. If you have any further questions or comments regarding
this documentation please feel free to contact us anytime.
For more information on the LPMS-B2 or other product series, please refer to
related datasheets and user manuals, available from the LP-RESEARCH website at
the following address: http://www.lp-research.com.
Table 1-1. LPMS-B2 Series part number information
Part Number
Bluetooth
Classic 2.0
Bluetooth Low
Energy 4.1
Enclosure
Case
Embedded
Battery
LPMS-B2
✓
✓
✓
✓
LPMS-B2 OEM
✓
✓



LPMS-B2 Series Hardware Manual ver. 1.0
- 2 -
2. System Overview
Fig. 2.1. LPMS-B2 series sensor structure
Charger and Battery Unit
MCU
3 axis
Accelerometer
3 axis
Gyroscope
3-axis
Magnetometer
Pressure
Sensor
Flash Unit
Bluetooth Unit
Data/Command
5V DC

LPMS-B2 Series Hardware Manual ver. 1.0
- 3 -
3. Coordinate
The LPMS sensor calculates the orientation difference between a fixed sensor
coordinate system (S) and a global reference coordinate system (G). Both coordinate
systems are defined as right-handed Cartesian coordinate systems. The sensor
coordinate system (S) is constructed as following images.
Fig. 3.1. Sensor coordinates of LPMS-B2 and LPMS-B2 OEM
The global reference coordinate system (G) can be divided into two different
cases. While the orientation calculation is using all acceleration, gyroscope and
magnetic data (sensor filter mode set at acc+gyr+mag), (G) system is defined as
following:
•X positive when pointing to the magnetic north
•Y positive when pointing to the magnetic west
•Z positive when pointing up (gravity points vertically down with -1g)
While the orientation calculation is using only acceleration and gyroscope data
(sensor filter mode set at acc+gyr), (G) system is defined as following:
•X positive aligned to ground plane horizontal projection of x axis of (S) when
sensor powered on
•Y positive based on right-handed Cartesian coordinate definition
•Z positive when pointing up (gravity points vertically down with -1g)
X
Z
Y
Z
Y
X

LPMS-B2 Series Hardware Manual ver. 1.0
- 4 -
4. Specification
Table 4-1. Overall parameters
Parameters
LPMS-B2
LPMS-B2 OEM
Output range of Euler angle
Roll: ±180°; Pitch: ±90°; Yaw: ±180°
Bandwidth
400Hz
Resolution
<0.01°
Accuracy
<0.5°(Static), <2°RMS (Dynamic)
Max. instant impact (0.1 ms)
10,000g
Output data type
Raw data/Euler/Quaternion/Linear acceleration/Air
pressure/Altitude/Temperature
Latency
20 ms
Internal sampling rate
400Hz
Communication interface
Bluetooth Classic 2.0 (BLE4.1 Optional)
Max. baudrate
921600 bps
Communication protocol
LPBUS
Size
39x39x8 mm
16x31x4 mm
Weight
12 g
2g
Communication distance
<20m
Max. data update rate
400Hz
Power consumption
<132mW @ 3.3V
Power supply
Lithium Battery > 6h
(3.7V@230mAh)
3.3-5.5V DC
Working temperature
-20~+60 °C
-40 ~ +80 °C
Connector*
Micro USB, type B
Micro USB, type B;
SM02B-SURS-TF;
*LPMS-B2 USB connector is only used for charging, the sensor is powered by the
internal embedded lithium battery.

LPMS-B2 Series Hardware Manual ver. 1.0
- 5 -
Table 4-2. Accelerometer Specification
Parameters
Typical Value
Unit
Measurement range
±2/±4/±8/±16
g
Sensitivity
0.061/0.122/0.244/0.488
mg/LSB
Linear acceleration
sensitivity change
vs. temperature
±1
%
Linear acceleration
typical zero-g level
offset accuracy
±40
mg
Linear acceleration
zero-rate change
vs. temperature
±0.5
mg/°C
Acceleration noise
density
90
(FS= ±2 g ODR = 104 Hz)
μg/√Hz
Table 4-3. Gyroscope Specification
Parameters
Typical Value
Unit
Measurement range
±125/±245/±500/±1000/±2000
dps
Sensitivity
4.375/8.75/17.50/35/70
mdps/LSB
Angular rate
sensitivity change
vs. temperature
±1.5
%
Angular rate typical
zero-rate level
±10
dps
Angular rate typical
zero-rate level
change vs.
temperature
±0.05
dps/°C
Rate noise density
7
mdps/√Hz

LPMS-B2 Series Hardware Manual ver. 1.0
- 6 -
Table 4-4. Magnetometer Specification
Parameters
Typical Value
Unit
Measurement range
±4/±8/±12/±16
Gauss
Sensitivity
6842/3421/2281/1711
LSB/gauss
Zero-gauss level
±1
(FS=±4 gauss)
gauss
RMS noise
(Ultra-high-perform
ance mode)
X axis
3.2
mgauss
Y axis
3.2
mgauss
Z axis
4.1
mgauss
Non-linearity
±0.12
%FS
Table 4-5. Pressure and Humidity Sensor Specification
Parameters
Typical Value
Unit
Pressure
measurement range
300~1100
hPa
Temperature
coefficient of offset
±1.5
Pa/K
Absolute accuracy
pressure
±1.0
hPa
Pressure sensitivity
0.18
Pa
Pressure noise
1.3
Pa
Humidity
measurement range
0~100
%RH
Humidity accuracy
±3
%RH
Humidity latency
（10~90~10 %RH，
25 °C）
±1
%RH
Humidity sensitivity
0.008
%RH
Humidity noise
0.02
%RH
Humidity stability
（10~90 %RH,
25 °C）
0.5
%RH/year

LPMS-B2 Series Hardware Manual ver. 1.0
- 7 -
5. Battery Charging
Charging
The LPMS-B2 sensor can be charged through the micro USB port. In case of
LPMS-B2 OEM, users have to specify the methods of power supply for their own
designs.
The charging voltage for LPMS-B2 is 5V and the required power current is at
least 100mA for an efficient charging progress. Depending on the remaining power in
the battery, the on-board LED will show different charging status by different colors.
Detailed information of the LED status is introduced in the following section.
LED Indication
Table 5-1. LED Status Indication
Work Mode
LED Status
LED Color
Remaining
Battery
Normal
Connection off
Blinking light
Blue
>10%
Red
<10%
Connection on
Pulsating light
Blue
>10%
Red
<10%
Charging
Always on
Green
>90%
Blue
20%~90%
Red
<20%

LPMS-B2 Series Hardware Manual ver. 1.0
- 8 -
6. Mechanical Information
Fig. 6.1. LPMS-B2 Dimension
Fig. 6.2. LPMS-B2 OEM Dimension

LPMS-B2 Series Hardware Manual ver. 1.0
- 9 -
Copyright © 2020, LP-RESEARCH Inc. All rights reserved.
http://www.lp-research.com