TORUS-SN power calculator

For evaluation Doc TORUS-SN-CALC-001 Rev 2026-08 Class Power budget tool

Interactive energy budget for the TORUS-SN sensor node across LoRa airtime, sensor duty cycle and vector-math load. The model covers the current baseline: STM32U575 host with the gated iCE40 vector-math unit, LR1120 radio, T5848 microphones with acoustic activity detect, and ADS1220 geophone ADC.

Planning model, not a guaranteed specification

Average-energy estimate, not a peak-current or inrush calculation. Endurance and capacitor figures remain planning-model outputs until the bench measurements in SN datasheet gate 8.2 close.

Node average power

STM32U575 + iCE40 UP5K + LR1120

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milliwatts (mW), averaged over a year

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equivalent average current at the cell

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endurance on one 17 Ah cell

Vector duty -

Energy per inference -

Peak inference rate -

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Acoustic (T5848)

AAD analogue, CLK off, 20 µA AAD digital 1 / low power, 130 µA High quality, always streaming, 330 µA Disabled

Mic count 2

Seismic (ADS1220 + geophone)

Enabled, gated between events

ADC window 2.0 s

LoRa frame

Payload 20 B

SF7SF8SF9SF10SF11SF12 125 kHz250 kHz 4/54/64/74/8

TX +10 dBm EU, 25 mATX +22 dBm, 118 mA

Radio schedule

Heartbeat 5 min

Reported 2%

Wake on LoRa (RxDutyCycle)

Environment and sensitivity

Quiet rural / remote Moderate (wind, distant traffic) Noisy (urban, industrial)

Mic sens. 5

Seismic sens. 5

Vector math per trigger

Window 1.0 s

Inf. rate 10 Hz

MACs 500k

U575 while(1), 160 MHz typical: 5.10 mA U575 CoreMark proxy, 160 MHz typical: 6.55 mA U575 SecureMark proxy, 160 MHz typical: 7.35 mA U575 datasheet design maximum: 14.00 mA

WiFi, GNSS, training

WiFi AP sweep on LR1120

Interval 30 s

3 channels, 330 ms14 channels, 1540 ms GNSS boot + motion onlyGNSS dailyGNSS hourly

Train h/yr 8 h

Battery conversion

Cell V avg. 3.3 V

Efficiency 90%

Converts regulated-rail loads to battery current. Converter IQ, gauge current, and capacitor leakage are already cell-side.

Average-energy estimate, not a peak-current or inrush calculation. Datasheet typical currents exclude application-specific GPIO and peripheral loading; validate the final firmware and hardware on the bench.

TORUS-SN datasheet Node variants