Rainbow-electronics DS1511 Uživatelský manuál stáhnout pdf (Strana 8)

DS1501/DS1511 Y2KC Watchdog Real-Time Clocks

8 of 20

WAKEUP/KICKSTART TIMING

= +25°C) (Figure 7)

PARAMETER SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Kickstart-Input Pulse Width t

KSPW

Wakeup/Kickstart Power-On Timeout t

POTO

(Note 10) 2 s

Note: Time intervals shown above are referenced in Wakeup/Kickstart.

Figure 7. Wakeup/Kickstart Timing Diagram

KSPW

POTO

CO N D IT IO N :

BAT

CO N D IT IO N :

BAT

TDF/KSF

(INTERNAL)

HI-Z

____

IRQ

HI-Z

____

PW R

___

INT ER VALS

Note 1: Limits at -40°C are not production tested and are guaranteed by design.

Note 2: RTC modules can be successfully processed through conventional wave-soldering techniques as long as temperature exposure to the

lithium energy source contained within does not exceed +85°C. Post-sold cleaning with water-washing techniques is acceptable,

provided that ultrasonic vibration is not used to prevent damage to the crystal.

Note 3: Voltage referenced to ground.

Note 4: Outputs are open.

Note 5: The IRQ, PWR, and RST outputs are open drain.

Note 6: If V

is less than V

BAT

and V

BAUX

, the device power is switched from V

to the greater of V

BAT

or V

BAUX

when V

drops below V

. If V

is greater than V

BAT

and V

BAUX

, the device power is switched from V

to the greater of V

BAT

or V

BAUX

when V

drops below the greater

of V

BAT

or V

BAUX

Note 7: V

BAT

or V

BAUX

current. Using a 32,768Hz crystal connected to X1 and X2.

Note 8: These parameters are sampled with a 5pF load and are not 100% tested.

Note 9: t

is the amount of time that the internal battery can power the internal oscillator and internal registers of the DS1511.

Note 10: If the oscillator is not enabled, the startup time of the oscillator after V

CC1

is applied will be added to the wakeup/kickstart timeout.

Note 11: Typical values are at +25°C, nominal (active) supply, unless otherwise noted.

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