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EM1537

EM Microelectronic

Low-Power CMOS

R EM MICROELECTRONIC - MARIN SA EM1537 Low Power 32 kHz Circuit for Analog Quartz Watches Description The EM1537 is a...


EM Microelectronic

EM1537

File Download Download EM1537 Datasheet


Description
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. Motor period in Motor test mode is selectable 2 x 31.25 ms or 2 x 62.5 ms by metal mask Input and output capacitors are integrated on chip and also programmable by metal mask. With a fully debounced RESET pad the motor can be stopped. A multi-functional bidirectional pad MTEST acts as output for a 32 Hz or 512 Hz for frequency tuning - if open, or – if connected to Vp – accelerates the motor period by a factor of 16 or 32. Features ƒ Low power 32 kHz Quartz oscillator ƒ Operating voltage ranges 1.55V and 3 Volt. ƒ Very low current consumption typ. 100 nA at 1.5V. ƒ Motor pulse width motor period and motor pulse chopping is programmable in a wide range by metal mask and don’t require additional bonds. ƒ F...




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