Use this embedded-systems calculation to configure or check a timer, serial bus, ADC, PWM, buffer, power mode, flash budget, or watchdog from known clock and device parameters.

Supply Volts (V)

Required number input.

Threshold Volts (V)

Required number input.

Compare present supply voltage with a selected brown-out threshold; hysteresis and reset timing are device-specific. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Below Threshold

The resulting below threshold returned as a boolean.

• Register widths, clock trees, prescalers, oscillator tolerance, interrupt latency, peripheral modes, voltage references, quantization, sleep states, endurance conditions, and silicon errata are device-specific.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm equations against the exact datasheet and reference manual, derive register values with integer rounding visible, and verify timing or voltage on hardware.

• Timer Tick Period

  Timer tick interval from source clock and the effective prescaler divisor, before rollover or compare logic. If a device uses a PSC register with divisor PSC+1, enter PSC+1.

• ADC Code To Voltage

  Ideal unipolar endpoint-inclusive ADC code-to-voltage conversion, where the maximum code maps to Vref.

• Timer Compare Frequency

  Compare-event rate for an up-counter that resets after an inclusive compare value. Enter the effective prescaler divisor; devices with a PSC register may divide by PSC+1.