Otii Arc Pro

High-precision energy consumption analysis & optimization tool.

The Otii Arc Pro is a compact and portable tool with comprehensive technical features for energy optimization of battery-driven and energy-harvesting devices. As a multi-purpose tool, it serves as a power supply, measurement unit, analyzer and debugger, making it the must-have addition for everyday use on any hardware, firmware and software developer’s desktop.

With Otii Arc Pro and Otii 3 Desktop App, you can source the voltage of the device under test (DUT) up to 5V while simultaneously measuring and recording current, voltage, and power data in real-time for further analysis to optimize battery life throughout the development cycle, supporting a sample rate up to 4ksps for main current channel, plus a wide dynamic current measurement range (nA-5A) with 5nA resolution, and accurate current measurement (±0.1% + 50nA) for currents below 19mA and (±0.1% + 150uA) for higher currents.

To elevate the Otii Arc Pro's capabilities for product development, test and verification, quality assurance, and maintenance, explore Otii Toolbox, a set of specialized licenses that can be purchased as perpetual or subscribed to on yearly or monthly basis.

Key benefits

• All-in-one functionality: Otii hardware and Otii software integrates power supply, real-time monitoring, and detailed analysis in a single, compact, user-friendly product.

• Quick installation & easy to use: Download Otii 3 Desktop app, plug the Otii Arc Pro to your device under test (DUT) and start measuring energy data in less than a minute.

• Optimal power alternatives: Power up Otii Arc Pro based on your solution setup and power requirements via USB or an external DC adapter.

• Versatile connection: Power source your device under test using the Otii Arc Pro, which can deliver up to 5V at high voltage/current resolution. The DUT can be connected either through its DC input or battery connectors.

• Real-time measurements & analysis: Analyze and compare charts and measurements in real-time, covering currents, voltages, and power within the Otii 3 Desktop App – it allows scrolling, zooming, and selecting current consumption and debugging logs during measurement.

• Continuous serial synchronization: Measurements are continuously synchronized with debug logs from the device under test via UART.

• Responsive UI: Ensure smooth performance under heavy data measurements loads, supporting multiple streams and long recordings – optimized for high-definition displays to enhance user experience during analysis.

• Collaborative features: Share recordings and analyses with team members to get insights and feedback for further product releases on a recurring basis.

• Upgradeable software: Unlock a wider range of features and specialized functionalities, including battery profiling and automation tools.

Key features

Hardware

Current and voltage measurement

• ±(0,1% + 50nA) accuracy below 19mA and +-(0.1%+150uA) above 19mA

• 5nA current measurement resolution

• 24 bit ADC with automatic switching between ranges

• No burden voltage

• Voltage measurement accuracy ±(0.1% + 1.5 mV)

Sample rate

• Up to 4ksps for main current channel

• 1ksps for all other channels (main voltage, ADC current, ADC voltage, SENSE+, SENSE-, UART RX, GPI1, GPI2)

Power supply

• 0.5V - 5.0V.

• USB only (0.5V - 3.75V in auto range mode, 0.5V - 4.2V in high range mode)

• DC plug supply (0.5V - 4.55V in auto range mode, 0.5V - 5.0V in high range mode)

• -2.5A to 5A (depends on available current from USB or DC plug)

Digital interface

• Digital IO voltage 1.2V - 5.0V

• Max 10mA source and sink in total

Software

• Otii software support for Microsoft Windows, Apple macOS, and Linux Ubuntu.

• Real-time graphs of currents, voltages, power measurements and digital inputs.

• Analyze statistics and measurements while recording continues in the background.

• Connect multiple Otii Arc Pro to manage and sync multiple recordings at the same time.

• Record and manage multiple recordings for unlimited time.

• Record and sync data with UART logs.

• Customize recordings and channels names to make the change logs easy to trace during your solution's development cycle.

• Save, load, and export projects as a zip-archive, or recording data as CSV for further analysis in collaboration with your team.

• In-line and 4-wire measurement support.

• Unlimited changes with undo/redo functionality.

Applications

Use Otii Arc Pro every day to:

• Power your devices under development

• Energy profile microcontrollers, sensors and devices in real-time and over time

• Optimize sleep current and extend battery life

• Design power-efficient hardware, firmware and software through regression testing

• Troubleshoot your hardware, firmware and software

• Sync UART logs with power measurements to see what drains the energy

Datasheet

General

OPERATING ENVIRONMENT	Min	Typical	Max
Temperature	15°C / 60°F		30°C / 86°F
Humidity	30 %		60 %

Main

USB POWER SUPPLY ⁽¹⁾	Min	Typical	Max
Output voltage (auto range)	0.5 V		3.75 V
Output voltage (locked to high current range)	0.5 V		4.2 V
Output voltage setting resolution
Output current	250 mA	up to 1A ⁽¹⁾

EXTERNAL 7.5V-9V POWER SUPPLY ⁽¹⁾	Min	Typical	Max
Output voltage (auto range)			4.55 V
Output voltage (locked to high current range)	0.5 V		5.0 V
Output voltage setting resolution		1 mV
Output current, max continuous ⁽³⁾		2.5 A
Output current, max peak ⁽³⁾		5 A

PROGRAMMABLE CURRENT SINK (requires an Otii Toolbox)	Min	Typical	Max
Sink current	0 A		2.5 A
Sink current, setting resolution		39 µA
Sink voltage, USB power supply	0.85 V ⁽⁴⁾		4.2 V
Sink voltage, external power supply	0.85 V ⁽⁴⁾		5.0 V

CURRENT MEASUREMENT	Min	Typical	Max
Accuracy		±(0.1% + 50 nA)⁽⁵⁾
Sample Rate in ±19 mA range		4 ksps
Sample Rate in ±2.7A range		1 ksps
Sample Rate in ±5.0 A range		1 ksps
Analog bandwidth (3 dB)		400 Hz

VOLTAGE MEASUREMENT	Min	Typical	Max
Total accuracy		±(0.1% + 1.5 mV)
Sample rate		1 ksps

Expansion port

UART	Min	Typical	Max
Bitrate	110 bps		5.25 Mbps

DIGITAL I/O	Min	Typical	Max
Digital IO operating voltage	1.2 V	Vio ⁽⁷⁾	5 V ⁽⁸⁾
VIL Low-level input voltage. VIL			Vio*0.2V
VIH High-level input voltage	Vio*0.8V
Imax, Max sink/source current (total for GPIOs)	-10 mA		10 mA

Differential ADC, pins ADC- and ADC+	Min	Typical	Max
Voltage input	0 V		5 V
Shunt voltage range	-81.9175 mV		81.2 mV
Resolution		2.5 µV
Accuracy		±(0.1% + 10 µV)
Input impedance		220 kΩ

Single ended ADC, pins ADC- and ADC+	Min	Typical	Max
Voltage input	0 V		5 V
Resolution		1.25 mV
Accuracy		±(0.1% + 7.5mV)
Input impedance		830 kΩ

SENSE, pins SENSE- and SENSE+	Min	Typical	Max
Voltage input	0 V		5 V
Resolution		1.5 mV
Accuracy		1%
Input impedance		1 MΩ

EXPANSION PORT POWER SUPPLY	Min	Typical	Max
Output voltage		5 V
Output current			500 mA

USB and DC JACK

DC JACK	Min	Typical	Max
Input voltage	7 V		9 V
Input current			5 A

USB	Min	Typical	Max
VBUS voltage ⁽⁴⁾	4.75 V		5.25 V
VBUS current ⁽⁴⁾			3 A

⁽¹⁾ USB power capacity and reliability in laptops and desktops greatly depend on host USB port/cable design. ⁽²⁾ See list of recommended external power supplies and powered USB hubs at our FAQ. ⁽³⁾ Depends on chosen power supply. Otii Arc Pro will monitor internal temperature and cut off if temperature limit is reached. ⁽⁴⁾ Sink voltage can go below this specification if locked to high range. It is possible to go down to 0.5 V if the sink current is below 1.9 A. For currents below 19 mA, the measurement will have a lot more noise when locked to high range than in auto range. ⁽⁵⁾ Up to 19 mA current in auto range, for higher currents, the accuracy is ±(0.1 % + 150 µA). Average > 1s. ⁽⁶⁾ See Nexperia SN74LVC8T245 for details. ⁽⁷⁾ Expansion Port Digital voltage level is set by user in Otii SW. ⁽⁸⁾ Maximum voltage will depend on your USB power supply and USB cable. ⁽⁹⁾ See TI INA226 for details.