PCA2002U: 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.
PCA2002U: 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 | Status | Package version | Application | Function |
|---|---|---|---|---|
| PCA2002U/10AB/1 | Active | NAU000 | ||
| PCA2002U/AB/1 | Active | NAU000 | ||
| PCA2002U/10AA/1 | No Longer Manufactured | NAU000 | ||
| PCA2002U/AA/1 | No Longer Manufactured | NAU000 |
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 |
