C005 Timer - Resistor Calculator
Calculation formula
Resistor value:
R = a × tb
Where:
R = a × tb
Where:
- R = Resistance (Ohms, Ω)
- t = Desired time (seconds)
- a and b = coefficients interpolated by supply voltage (see below)
Note: The calculator uses linear interpolation for a and b between 3V and 4.5V:
a = a₁ + (a₂ − a₁) × (V − 3) / (4.5 − 3)
b = b₁ + (b₂ − b₁) × (V − 3) / (4.5 − 3)
where a₁ = 2194, b₁ = 1.0637 (for 3V), a₂ = 2314, b₂ = 1.0685 (for 4.5V), V = supply voltage (V)
a = a₁ + (a₂ − a₁) × (V − 3) / (4.5 − 3)
b = b₁ + (b₂ − b₁) × (V − 3) / (4.5 − 3)
where a₁ = 2194, b₁ = 1.0637 (for 3V), a₂ = 2314, b₂ = 1.0685 (for 4.5V), V = supply voltage (V)