Cypress CY14B101K manual Recommended Values, Interrupt Block Diagram

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Watchdog

WDF

CY14B101K

Figure 5. Interrupt Block Diagram

Timer

Power

Monitor

VINT

Clock Alarm

WIE

PFE

AIE

	P/L		VCC

Pin Driver

H/L VSS

	WDF - Watchdog Timer Flag
	WIE - Watchdog Interrupt
	Enable
	PF - Power Fail Flag
INT	PFE - Power Fail Enable
	AF - Alarm Flag
	AIE - Alarm Interrupt Enable
	P/L - Pulse Level
	H/L - High/Low

Figure 6. RTC Recommended Component Configuration

1
C	Y
RF	Y
	1
2
C

DQ 0

A2 A1

Recommended Values

Y1 = 32.768KHz

RF = 10M Ohm

C1 = 0 (install cap footprint, but leave unloaded) C2 = 56 pF + 10% (do not vary from this value)

Note

4.Schottky diodes, (VF < 0.4V at IF=100mA) are recommended at pins A0 - A3 and DQ0 in applications where undershoot exceeds -0.5V. Please see application note AN49947 for further details.

Document Number: 001-06401 Rev. *I

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Contents Functional Description FeaturesLogic Block Diagram Cypress Semiconductor Corporation 198 Champion CourtPower Supply Inputs to the Device Pin ConfigurationsOutput Enable, Active LOW. The active low Pin DefinitionsAutoStore Operation Device OperationHardware Store HSB Operation Software Recall Hardware Recall Power UpSoftware Store Data ProtectionLow Average Active Power Best Practices Current versus Cycle TimeWrite Sram Mode Selection A15 A0 PowerRead Sram StoreReal Time Clock Operation Watchdog Timer AlarmCalibrating the Clock Interrupt Register Power MonitorInterrupts Flags RegisterInterrupt Block Diagram Recommended ValuesRTC Register Map5 BCD Format Data Function/Range WDF OscfDate Time Keeping Hours 0x1FFFB Register Map Detail Time Keeping Years 0x1FFFF 10s YearsTime Keeping Months 0x1FFFE 10s Month Time Keeping Minutes 0x1FFFA0x1FFF7 Alarm Day 0x1FFF5Register Map Detail Calibration/Control Interrupt Status/Control 0x1FFF6To ignore the hours value Alarm Minutes 0x1FFF3 Register Map Detail Alarm Hours 0x1FFF4 10s Alarm HoursWhen the Flags register is read or on power-up Maximum Ratings DC Electrical CharacteristicsRange Ambient Temperature Operating RangeThermal Resistance Data Retention and EnduranceCapacitance AC Test ConditionsAC Switching Characteristics Parameter Sram Read CycleMin Max Parameter Sram Write CycleAutoStore or Power Up Recall Parameter Description CY14B101K Unit Min MaxSoftware Controlled STORE/RECALL Cycles 21 Parameter Alt Description 25 ns 35 ns 45 ns Unit Min MaxSoft Sequence Commands Hardware Store CycleInputs and Outputs Mode Power RTC CharacteristicsTruth Table For Sram Operations Part Numbering Nomenclature CY 14 B 101 K SP 25 X C T NvsramOrdering Information Package Diagrams Pin Shrunk Small Outline PackageDocument History Orig. of Change Submission Description of Change DateUpdated Features 2663934Worldwide Sales and Design Support Products PSoC Solutions Sales, Solutions, and Legal InformationUSB