Cypress STK17T88 RTC DC Characteristics

STK17T88

Document Number: 001-52040 Rev. *A Page 5 of 22

RTC DC Characteristics

Figure 4. RTC 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 Minimum 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 STK17T88 32K x 8 AutoStore nvSRAM with Real Time Clock Features Description Logic Block Diagram Document Number: 001-52040 Rev. *A Page 2 of 22 Pin Configurations [+] Feedback Figure 1. 48-Pin SSOP (TOP) Note 1. For detailed package size specifications, see Package Diagram on page 21. Absolute Maximum Ratings RF (SSOP-48) Package Thermal Characteristics DC Characteristics AC Test Conditions Capacitance DC Characteristics RTC DC Characteristics SRAM READ Cycles #1 and #2 STK17T88 Document Number: 001-52040 Rev. *A Page 7 of 22 [+] Feedback SRAM WRITE Cycles #1 and #2 Figure 7. SRAM WRITE Cycle #1: W Controlled[7, 8] STK17T88 AutoStore/Power Up RECALL Software-Controlled STORE/RECALL Cycle Document Number: 001-52040 Rev. *A Page 10 of 22 Hardware STORE Cycle Soft Sequence Commands 31 tDELAY tHLQZ Hardware STORE to SRAM Disabled 1 70 s14 32 tHLHX Hardware STORE Pulse Width 15 ns 33 tSS Soft Sequence Processing Time 70 s 15, 16 MODE Selection nvSRAM Operation SRAM READ SRAM WRITE AutoStore Operation Hardware STORE (HSB) Operation Software STORE Software RECALL Data Protection Noise Considerations Preventing AutoStore Real Time Clock Reading the Clock Setting the Clock Backup Power Stopping and Starting the RTC Oscillator Interrupts Interrupt Register Flags Register STK17T88 RTC Register Map Page Register Map Detail Ordering Codes Register Map Detail Commercial and Industrial Ordering Information STK17T88 - R F 45 I TR Page Document History Page Sales, Solutions, and Legal Information Worldwide Sales and Design Support Products PSoC Solutions