LP-RESEARCH LPMS-B2 Hardware Manual

LPMS-B2 Series
Hardware Manual ver. 1.0
LP-RESEARCH Inc.
http://www.lp-research.com
Version History
Date
Revision
2020-03-10
1.0
Changes
- 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. 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
Bluetooth
Classic 2.0
Bluetooth Low
Energy 4.1
Enclosure
Case
Embedded
Battery
LPMS-B2
✓
✓
✓
✓
LPMS-B2 OEM
✓
✓


Part Number
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LPMS-B2 Series Hardware Manual ver. 1.0
2. System Overview
5V DC
Charger and Battery Unit
Pressure
Flash Unit
Sensor
3 axis
Gyroscope
3 axis
MCU
Accelerometer
3-axis
Magnetometer
Data/Command
Bluetooth Unit
Fig. 2.1. LPMS-B2 series sensor structure
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LPMS-B2 Series Hardware Manual ver. 1.0
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.
Z
Y
X
Z
Y
X
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)
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LPMS-B2 Series Hardware Manual ver. 1.0
4. Specification
Table 4-1. Overall parameters
Parameters
LPMS-B2
Output range of Euler angle
LPMS-B2 OEM
Roll: ±180°; Pitch: ±90°; Yaw: ±180°
Bandwidth
400Hz
Resolution
<0.01°
Accuracy
<0.5°(Static), <2°RMS (Dynamic)
Max. instant impact (0.1 ms)
Output data type
10,000g
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
-20~+60 °C
-40 ~ +80 °C
Working temperature
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.
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LPMS-B2 Series Hardware Manual ver. 1.0
Table 4-2. Accelerometer Specification
Parameters
Typical Value
Unit
Measurement range
±2/±4/±8/±16
g
0.061/0.122/0.244/0.488
mg/LSB
±1
%
±40
mg
±0.5
mg/°C
90
ODR = 104 Hz)
μg/√Hz
Sensitivity
Linear acceleration
sensitivity change
vs. temperature
Linear acceleration
typical zero-g level
offset accuracy
Linear acceleration
zero-rate change
vs. temperature
Acceleration noise
density
(FS= ±2 g
Table 4-3. Gyroscope Specification
Parameters
Typical Value
Unit
Measurement range
±125/±245/±500/±1000/±2000
dps
4.375/8.75/17.50/35/70
mdps/LSB
±1.5
%
±10
dps
±0.05
dps/°C
7
mdps/√Hz
Sensitivity
Angular rate
sensitivity change
vs. temperature
Angular rate typical
zero-rate level
Angular rate typical
zero-rate level
change vs.
temperature
Rate noise density
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LPMS-B2 Series Hardware Manual ver. 1.0
Table 4-4. Magnetometer Specification
Parameters
Typical Value
Unit
Measurement range
±4/±8/±12/±16
Gauss
6842/3421/2281/1711
LSB/gauss
Sensitivity
±1
Zero-gauss level
RMS noise
(Ultra-high-perform
ance mode)
Non-linearity
gauss
(FS=±4 gauss)
X axis
3.2
mgauss
Y axis
3.2
mgauss
Z axis
4.1
mgauss
±0.12
%FS
Table 4-5. Pressure and Humidity Sensor Specification
Parameters
Typical Value
Unit
300~1100
hPa
±1.5
Pa/K
±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
Pressure
measurement range
Temperature
coefficient of offset
Absolute accuracy
pressure
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LPMS-B2 Series Hardware Manual ver. 1.0
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
Connection off
Blinking light
Connection on
Pulsating light
Normal
Charging
Always on
-7-
LED Color
Blue
Red
Blue
Red
Green
Blue
Red
Remaining
Battery
>10%
<10%
>10%
<10%
>90%
20%~90%
<20%
LPMS-B2 Series Hardware Manual ver. 1.0
6. Mechanical Information
Fig. 6.1. LPMS-B2 Dimension
Fig. 6.2. LPMS-B2 OEM Dimension
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LPMS-B2 Series Hardware Manual ver. 1.0
Copyright © 2020, LP-RESEARCH Inc. All rights reserved.
http://www.lp-research.com
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