PCA2002: 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.

PCA2002: Product Block Diagram

Data Sheets (1)

Name/Description	Modified Date
32 kHz watch circuit with programmable output period and pulse width (REV 8.0) PDF (393.0 kB) PCA2002	25 Nov 2011

Application Notes (3)

Name/Description	Modified Date
Programming the PCA200x family of watch ICs (REV 1.0) PDF (301.0 kB) AN11219	06 Mar 2015
ESD and EMC sensitivity of IC (REV 1.0) PDF (745.0 kB) AN10853	14 Mar 2013
Handling bare die (REV 2.0) PDF (1.6 MB) AN10706	16 Jun 2011

Users Guides (1)

Name/Description	Modified Date
Store and transport requirements (REV 3.0) PDF (325.0 kB) UM10569	10 Mar 2015

Ordering Information

Product

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	IFR(FIT)	MTBF(hour)
PCA2002U/10AB/1				Wafer, Sawn on FFC, Non-Conductive	Active	PCA2002U/10AB/1,00 (9352 781 68005)	Standard Marking	PCA2002U/10AB/1		Always Pb-free	5	2E8
PCA2002U/AB/1				Die In Waffle Carriers 2"	Active	PCA2002U/AB/1,026 (9352 781 65026)	Standard Marking	PCA2002U/AB/1		Always Pb-free	5	2E8