Abstract: A displacement measurement device for a sensing device. The sensing device includes a first displacement sensor. The displacement measurement device includes: a drive signal generating circuit configured to output a drive signal to the first displacement sensor; a first signal processing circuit configured to receive a signal from the first displacement sensor and output a first ADSO signal; and a computing device including a first timer. The first timer is configured to receive a CLK512 signal and the first ADSO signal, and time or count according to the CLK512 signal and the first ADSO signal; and the CLK512 signal is a square wave signal related to a period and phase of the drive signal.