PCA2002CX8: 32 kHz watch circuit with programmable output period and pulse width

The PCA2002 is a CMOS integrated circuit for battery operated wrist watches with a 32 kHz quartz crystal as the timing element and a bipolar stepping motor. The quartz crystal oscillator and the frequency divider are optimized for minimum current consumption. A timing accuracy of 1 ppm is achieved with a programmable, digital frequency adjustment.

The output period and the output pulse width can be programmed. It can be selected between a full output pulse or a chopped output pulse with a duty cycle of 75 %. In addition, a stretching pulse can be added to the primary driving pulse.

A pad RESET is provided (used for stopping the motor) for accurate time setting and for accelerated testing of the watch.

PCA2002CX8: Product Block Diagram
Data Sheets (1)
Name/DescriptionModified Date
32 kHz watch circuit with programmable output period and pulse width (REV 8.0) PDF (393.0 kB) PCA200225 Nov 2011
Application Notes (3)
Name/DescriptionModified Date
Programming the PCA200x family of watch ICs (REV 1.0) PDF (301.0 kB) AN1121906 Mar 2015
ESD and EMC sensitivity of IC (REV 1.0) PDF (745.0 kB) AN1085314 Mar 2013
Handling bare die (REV 2.0) PDF (1.6 MB) AN1070616 Jun 2011
Users Guides (1)
Name/DescriptionModified Date
Store and transport requirements (REV 3.0) PDF (325.0 kB) UM1056910 Mar 2015
Ordering Information
ProductStatusPackage versionApplicationFunction
PCA2002CX8/12/1End of LifeNAU000
PCA2002CX8/5/1No Longer ManufacturedNAU000
PCA2002CX8/1No Longer ManufacturedNAU000
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateMSLMSL LF
PCA2002CX8/12/1Wafer, Sawn on FFC, Non-ConductiveDiscontinuedPCA2002CX8/12/1,00 (9352 936 34005)Standard MarkingPCA2002CX8/12/1Always Pb-freeNANA