Otii Standard Power Supply and Measure

Built by developers, for developers, Otii addresses the ultimate problem of optimizing for low energy consumption in device and app designs.
The Otii Arc is a small, portable power supply, a current and voltage measurement unit, and a data-acquisition module. Otii Arc is accompanied by an easy-to-use desktop application for Windows, Ubuntu & macOS.
Otii is a proud winner of the 2018 DESIGN&ELEKTRONIK innovator of the year award
Otii for individual developers and small companies
Otii Standard is the recommended solution for individual developers and most small companies. Otii Standard includes the Otii Arc measurement device and the Otii software (standard version).
Otii Arc measurement device
The Otii Arc acts both as a power supply to the IoT device being tested, and as a current and voltage measurement unit. It provides up to 5 V output voltage and runs high-resolution current measurements with a sample rate up to 4 ksps for the range of 1 ¦ÌA - 5 A.
Read more about the Otii Arc in the tech spec.
Otii software (standard version)
Otii is a powerful and easy-to-use desktop application for Ubuntu, Windows & macOS. Use it to collect and analyze data from the Otii Arc. Otii also exports the data to popular formats.
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Min
Unit
Max
OPERATING ENVIRONMENT
Operating Environment
15 ?C / 60 ?F
25 ?C / 77 ?F
USB POWER SUPPLY (1)
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 1 mV
Output Voltage Accuracy
¡À1%
Output Current
250 mA
EXTERNAL 7.5-9V POWER SUPPLY (2)
Output Voltage (auto range)
0.5 V
4.55 V
Output Voltage (locked to High Current range)
0.5 V
5.0 V

Output Voltage Setting Resolution 1 mV
Output Voltage Accuracy
¡À1%
Output Current, max continuous (3)
2.5 A
Output Current, max peak (3)
5.0 A
PROGRAMMABLE CURRENT SINK
Sink current 0 A 2.5 A
Sink current, resolution
39 ?A
Sink voltage, USB power supply
0.85V (4)
4.2 V
Sink voltage, external power supply
0.85V (4)
5.0 V
CURRENT MEASUREMENT
Accuracy ¡À(1% + 0.5 ?A)
Sample Rate in ¡À19 mA range
4 ksps
Sample Rate in ¡À2.7 A range
1 ksps
Sample Rate in 0 ¨C 5 A range
1 ksps
Analog Bandwidth (3dB)
400 Hz
VOLTAGE MEASUREMENT
Total accuracy
¡À(1% + 10 mV)
Sample Rate
1 ksps
UART
Bitrate
110 bps
5.25 Mbps
DIGITAL I/O; GPO1, GPO2, TX (5)
VIO Expansion Port Operating Voltage
1.2 V
VIO(6) 5 V(7)
VIL Low-level input voltage
VIO * 0.2 V
VIH High-level input voltage
VIO * 0.8 V
Imax Maximum sink/source current 10 mA
ADC, Differential Analog/Digital Conversion pins ADC-, ADC+ (8)
Voltage input O V 5 V
Shunt Voltage Range -81.9175 mV 81.2 mV
Resolution
2.5 ?V
Accuracy
¡À(0.1% + 10 ?V)
Input Impedance
220 k¦¸
ADC, Single Ended Analog/Digital Conversion pin ADC+
Voltage input O V 5 V
Resolution
1.25mV
Accuracy
¡À(0.1% + 7.5 mV)
Input Impedance
830 k¦¸
SENSE, pins SENSE- and SENSE+
Voltage input O V 5 V
Resolution
1.5mV
Accuracy
1%
Input Impedance 1M¦¸
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 www.otii.com/FAQ
3) Depends on chosen power supply. Otii Arc 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 0.5V if the sink current is below 1.9A. For currents below 19mA, the measurement will have a lot more noise when locked to high range than in auto range.
5) See Nexperia SN74LVC8T245 for details.
6) Expansion Port Digital voltage level is set by user in Otii SW.
7) Maximum voltage will depend on your USB power supply and USB cable.
8) See TI INA226 for details.

Part List£º
1 x Otii Standard
1 x Micro USB Cable