Cypress STK17T88 Manual De Usuario

Document Number: 001-52040  Rev. *A

Page 5 of 22

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

—

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