Cypress STK17TA8 RTC DC Characteristics

STK17TA8

Document #: 001-52039 Rev. ** Page 5 of 23

RTC DC Characteristics

Figure 4. RTC Recommended Component Configuration

Symbol Parameter Commercial Industrial Units Notes

Min Max Min Max

IBAK RTC Backup Current — 300 — 350 nA From either VRTCcap or VRTCbat

VRTCbat RTC Battery Pin Voltage 1.8 3.3 1.8 3.3 V Typical = 3.0 Volts during normal

operation

VRTCcap RTC Capacitor Pin Voltage 1.2 2.7 1.2 2.7 V Typical = 2.4 Volts during normal

operation

tOSCS RTC Oscillator time to start — 10 — 10 sec At MIN Temperature from Power up

or Enable

—5—5secAt 25°C from Power up or Enable

Recommended Values

Y1 = 32.768 KHz

= 10M Ohm

= 0 (install cap footprint,

but leave unloaded)

= 56 pF ± 10% (do not vary from this value)

[+] Feedback

Contents

Main STK17TA8 128k X 8 AutoStore nvSRAM with Real Time Clock Features Description Logic Block Diagram Document #: 001-52039 Rev. ** Page 2 of 23 Pinouts [+] Feedback (TOP) Pin Descriptions Note 1. For detailed package size specifications, See Package Diagrams on page22.. Absolute Maximum Ratings RF (SSOP-48) Package Thermal Characteristics DC Electrical Characteristics AC Test Conditions Capacitance DC Electrical Characteristics RTC DC Characteristics I V V t SRAM READ Cycles #1 and #2 STK17TA8 Document #: 001-52039 Rev. ** Page 7 of 23 [+] Feedback SRAM WRITE Cycles #1 and #2 Figure 7. SRAM WRITE Cycle #1: W Controlled[7, 8] STK17TA8 AutoStore/Power Up Recall Software-Controlled STORE/RECALL Cycle Hardware STORE Cycle Soft Sequence Commands MODE Selection nvSRAM Operation SRAM READ SRAM WRITE AutoStore Operation Hardware STORE (HSB) Operation Software RECALL Data Protection Noise Considerations Preventing AutoStore Best Practices RTC Operations Real Time Clock Reading The Clock Setting The Clock Backup Power Calibrating The Clock Alarm Watchdog Timer Power Monitor Interrupts Interrupt Register Flags Register STK17TA8 RTC Register Page Page Register Map Detail Ordering Information Ordering Codes STK17TA8-R F 45 ITR Page Document History Page Sales, Solutions, and Legal Information Worldwide Sales and Design Support Products PSoC Solutions