ON Semiconductor EVBUM2623 RSL10 Solar Cell Multi-Sensor Platform User Guide
- June 8, 2024
- ON Semiconductor
Table of Contents
ON Semiconductor EVBUM2623 RSL10 Solar Cell Multi-Sensor Platform
Introduction
The RSL10 Solar Cell Multi−Sensor Platform (RSL10−SOLARSENS−GEVK) is a comprehensive development platform for battery−free IoT applications for smart buildings, smart homes, and Industry 4.0 verticals. Based on the industry’s lowest power Bluetooth® Low Energy radio (RSL10), the board features sensors for environmental and motion sensing (BMA400−a smart 3−axis accelerometer, BME280− a smart environmental sensor, and the NCT203 wide−range digital temperature sensor).
The board also features a low-weight, low-profile 47 F storage capacitor; a
programming and debug interface; and a connected solar cell.
Since the device harvests energy from a low current source, it is important to
minimize leakage of the overall system during operation and standby. Along
with other energy-efficient devices, an ultra−low quiescent current LDO
(NCP170) on the board significantly minimizes leakage.
Hardware Description
Default Configuration
The development platform includes solar multi-sensor board hardware and a
connected solar cell. If you need to reconnect the solar cell or would like to
work with another solar cell than the one provided out of the box, follow the
guidelines in the section ‘Powering the Board’.
In addition to the RSL10 SIP (System−in−Package), the following sensors are present on the board.
- BMA400, 3−Axis Smart Accelerometer
- BME280, Environmental Sensor (temperature, humidity, pressure)
- NCT203, Wide−range (−40 to 125°C) Temperature
Sensor
The platform also features an ultra−low quiescent LDO (NCP170) and a 100 F
capacitor to store energy.
Powering the Board
The board is powered by a solar cell. The default solar cell used is Ribes
Tech FlexRB−25−7030, which has a typical operating voltage of 3 V. The
circuitry is protected by a clamp at 3 V, and the operating domain is 1.6 V to
2.65 V. Below 1.6 V, no transmission is allowed and the device is harvesting
energy; Above 2.65 V, the device starts to operate and depletes energy
buffering down to 1.6 V.
For more information about the power regulation section, refer to Continuous Harvesters and ON Semiconductor’s Low−Power RF Technology Close the Gap in Environmental and Accelerometer Sensors for IoT (TND6285/D). The powering cell or its equivalent can be mounted either by soldering both terminals or with the ZIF interface.
WARNING: ENSURE THE POLARITY OF THE PCB IS CORRECT WITH RESPECT TO ONE OF THE CELLS.
ELECTRICAL SPECIFICATIONS
Electrical Specifications of the Ribes Tech FlexRB−25−7030 Solar Cell
Operations
Normal Operations
Every transmission is signed with a LED pulse (LED D4 located just at the Left of RSL10). In case no transmission is seen or if the device looks to be hooked in out−of−operation hit the Reset button (S1) and wait for a few seconds.
In normal lighting conditions, the LED will blink faster than once per second.
Operating Conditions
The device has been tested under the following lighting conditions:
COMMON LIGHTING OPERATING CONDITIONS
| Light Source| Time| Solar Cell Facing| Sensor Location|
Lux Level (Note 1)
---|---|---|---|---|---
Cloudy Winter| Natural| 11:00 am| Sky| Office, Near Window| 415
“| “| “| Indoor| Office, Near Window| 230
“| “| “| Outdoor| Office, Near Window| 630
“| “| 3:40 pm| Indoor| Office desk| 200
“| Ceiling Neon| 11:00 am| Ceiling| Office Corridor| 340
“| “| “| Whitewall| Office Corridor| 220
“| “| “| Ground| Office Corridor| 140 (Note 2)
“| “| 4:30 pm| Ceiling| Office desk| 250
“| Natural| 9:00 am| Window| Automotive Dashboard| 700
“| “| “| Ground| “| 350
“| “| “| Front seat| “| 400
- Lux levels are measured with the uncalibrated IoS® App from Velux on iPhone® 6.
- Under similar lighting conditions, the device should automatically start up and begin transmitting sensor data. For more information on sensor operations, refer to the section ‘Firmware Implementation’.
Firmware Implementation
Default Configuration
The development platform is loaded with a preconfigured operating setting
where both onboard temperature sensors are polled once at a time
alternatively, and temperature information Loss is sent via a default
Eddystone beacon format. A freely available smartphone application like BLE
Scanner (Available on the IoS App Store or Google® Play) can be used to
display the received beacon packets.
Prerequisites
-
Install the 64−bit version of Java from https://www.java.com/en/download/
-
Install J−Link Version 6.32i or later from https://www.segger.com/downloads/jlink (select J−Link software and documentation pack)
-
Download and install “ON Semiconductor IDE Installer” from
https://www.onsemi.com/PowerSolutions/product. do?id=RSL10- Download the “RSL10 SDK Getting Started Guide” and RSL10 CMSIS pack under “RSL10 Software Package” from the above site. All of these are highlighted in the picture below. Save the CMSIS pack in a folder, for example, C:\cmsis_packs
- Download the “RSL10 SDK Getting Started Guide” and RSL10 CMSIS pack under “RSL10 Software Package” from the above site. All of these are highlighted in the picture below. Save the CMSIS pack in a folder, for example, C:\cmsis_packs
-
Download the B−IDK CMSIS pack from
https://www.onsemi.com/B−IDK and save it in the same folder as the RSL10 CMSIS pack (see 3. above) -
The CMSIS pack at item 4. is dependent on ARM CMSIS pack as well. Please install ARM CMSIS pack 5.5.1 or higher after downloading from: https://github.com/ARM−software/CMSIS_5/relea ses.
-
CMSIS pack at item 4. is also dependent on ARM CMSIS – FreeRTOS version 10.2.0 or higher for users exposed to design the code under FreeRTOS with RSL10: https://github.com/ARM−software/CMSIS−FreeR TOS/releases.
Importing the CMSIS−Packs
-
Launch the RSL10 ON Semiconductor IDE
NOTE: Please import the RSL10 CMSIS pack first as the B−IDK CMSIS pack (step 4 in the Prerequisites section) depends on the RSL10 CMSIS pack (step 3a in the Prerequisites section). -
Refer to Chapter 3 of the RSL10 SDK Getting Started Guide (step 3a) for step−by−step instructions on importing the CMSIS packs.
-
Once all packs are successfully imported, they can be viewed from the CMSIS pack manager perspective as shown below.
Since the board does not provide a debugging probe, a compatible standalone debugging probe is required. This can be any SEGGER J−Jink debug probe with a 10−pin Cortex® Debug connector adapter.
The board comes with a Ribes Tech solar cell attached. For the purposes of debugging and re−flashing the board, it is required to disconnect the solar cell from the board. The external power source needs to be connected to either of the VIN connectors. The power source can be alternatively connected to the VBAT header for the purpose of detailed power consumption analysis of RSL10 and associated sensors.
An example setup for debugging is shown in Figure 9 where the board is powered
by 3.3 V from a UART to USB converter and also uses the PROG header as a UART
TX line. For power measurements, the converter should be replaced by an
appropriate power consumption meter, and both debug probe and UART should be
disconnected.
Build Configurations
The project provides two build configurations that can be selected and built
using the Build Selector in the Toolbar.
Debug
This configuration should be used for debugging purposes only.
- Binary with debugging symbols ( -O0 -g3 ).
- Trace messages printed over UART peripheral using PROG DIO pad (Header J8, DIO12). Configuration for this port is: 230400 bps, 8N1, no flow control.
Sending of trace messages over UART slows down the execution of the program which might impact performance in some cases.
Release
This configuration should be used for power consumption measurements and
production builds.
- Optimized for speed, no debug symbols ( -O2 ).
- Trace messages are disabled.
CMSIS Configuration Header
The project provides a configuration header app_config.h located in the
included folder of the project. This header can be opened by using CMSIS
Configuration wizard editor as shown in Figure 10. The Configuration Wizard
allows some predefined program parameters to be changed without changing the
code directly. All options provide short descriptions and check for valid
setting value ranges.
Selecting CMSIS Configuration Wizard as the Default Editor for app_config.h
File
CMSIS Configuration Wizard with Available Program Settings
Figure 12 shows the current consumption of the board during a sensor
measurement event, followed by an advertisement of measured data. During this
event, a total of 60 µJ of energy was used to both measure sensor data and
advertise the results. If sensor measurement is not scheduled and the board
only advertises, the energy consumption is reduced to 20 µJ.
Typical Operation Cycle with Sensor Measurement and Advertising (3 V power supply, advertising interval set to 1 s, and sensor measurement during every advertising interval).
Debugging / Flashing
Refer to the RSL10 SDK Getting Started Guide Section 4.4 for instructions on
how to create debugging configurations and flash the program onto RSL10.
Bluetooth is a registered trademark of Bluetooth SIG.
Cortex is a registered trademark of Arm Limited (or its subsidiaries) in the
US and/or elsewhere. Google is a registered trademark of Google, Inc.
IoS and iPhone have registered trademarks of Apple, Inc.
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References
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