The ES211, a 1-chip composed of hall sensor and output coil drivers, appliedto 2-phase DC motor. The high sensitivity of Hall Effect sensor is suitable formotors from mini-type CPU coolers to blowers and DC fans. The device alsoinclude a amplifier that amplifies the Hall voltage, and a Schmitt trigger to provideswitching hysteresis for noise rejection, and complementary open-collector driversfor sinking large current loads. An internal bandgap regulator is used to providetemperature compensated supply voltage for internal circuits and allows a wideoperating supply voltage.