PCA1461U

The PCA146x 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 PCA1461U. 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 time calibration electrically programmable and reprogrammable (via EEPROM).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.The eighth one is no loss of motor steps possible because of on-chip detection of the induced motor voltage.The ninth one is detector for lithium or silver-oxide battery voltage levels.The tenth one is indication for battery end-of-life,etc.

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