Cypress AutoStore STK17TA8 - Manual (Page 5)

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
I
BAK
RTC Backup Current — 300 — 350 nA From either V
RTCcap
or V
RTCbat
V
RTCbat RTC Battery Pin Voltage 1.8 3.3 1.8 3.3 V Typical = 3.0 Volts during normal
operation
V
RTCcap RTC Capacitor Pin Voltage 1.2 2.7 1.2 2.7 V Typical = 2.4 Volts during normal
operation
t
OSCS
RTC Oscillator time to start — 10 — 10 sec At MIN Temperature from Power up
or Enable
— 5 — 5 sec At 25 °C from Power up or Enable
C
1
C
2
RF Y
1
X
1
X
2
Recommended Values
Y
1
= 32.768 KHz
= 10M Ohm
= 0 (install cap footprint,
but leave unloaded)
= 56 pF ± 10% (do not vary from this value)
RF
C
1
C
2
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