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R
EM MICROELECTRONIC - MARIN SA
EM1537
Low Power 32 kHz Circuit for Analog Quartz Watches
Description
The EM1537 is an integrated circuit in a low power CMOS technology for battery operated wristwatches with bipolar stepping motors. Time base is a 32 kHz crystal oscillator. It has a very low current consumption of typ. 100 nA in a wide voltage range of 1.2 to 3.6 Volt.
The IC is available in two voltage ranges - 1.2 to 1.8 Volt and 1.8 to 3.6 V.
Motor pulse width is programmable from 0.098 ms to 14.65 ms in steps of 0.98 ms by metal mask.
Motor period is programmable from 2 x 1s to 2 x 60 s in steps of 1 s selectable by metal mask.
Motor pulse chopping is programmable from 1/8 to 8/8 in steps of 1/8 with chopping frequencies of 1024 Hz or 2048 Hz selectable by metal mask.
EM1537 Datasheet
