PCA1485U/7

The PCA148x series devices are CMOS integrated circuits specially suited for battery-operated,quartz-crystal-controlled wrist-watches, with a bipolar stepping motor.

There are some absolute maximum ratings about PCA1485U/7. Supply voltage(VDD) is -1.8 V min and 6 V max when Vss is 0 V.All input voltage(V1) is Vss V min anf VDD V max.Operating ambient temperature(Tamb) is -10 min and 60 max.Storage temperature(Tstg) is -30 to 100.It has many unique features:The first one is 32 kHz oscillator, amplitude regulated with excellent frequency stability.The second one is high immunity of the oscillator to leakage currents.The third one is Power-on reset for fast testing.The forth one is a quartz crystal is the only external component required.The fifth one is very low current consumption; typically 170 nA.The sixth one is output for bipolar stepping motors of different types.The seventh one is up to 50% reduction in motor current compared with conventional circuits, by self adaption of the motor pulse width to match the required torque of the motor,etc.

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