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DS1677

16 of 17

POWER–FAIL WARNING Figure 14

NOTES:

1. All voltages are referenced to ground.

CCA

is specified with outputs open, CS set to a logic 1, SCLK=500 kHz, oscillator enabled, and A/D

converter enabled.

ADC

is specified with CS, V

CCO

open and I/O, SCLK at logic zero. A/D converter is enabled.

CCS

is specified with CS, V

CCO

open and I/O, SCLK at logic zero. A/D converter is disabled.

CS has a 40 kΩ pull–down resistor to ground.

Measured at V

=2.0V or V

=0.8V and 10 ns maximum rise and fall time.

Measured at V

=2.4V or V

=0.4V.

Load capacitance= 25 pF.

CCO

=100 mA, V

> V

CCTP

10.

CCO

switchover from V

to V

BAT

occurs when V

drops below the lower of V

CCSW

and V

BAT

11.

Current from V

input pin to V

CCO

output pin.

12.

Current from V

BAT

input pin to V

CCO

output pin.

13.

Timebase is generated by very accurate crystal oscillator. Accuracy of this time period is based on

the crystal that is used. A typical crystal with a specified load capacitance of 6 pF will provide an

ccuracy within

±100 ppm over the 0°C to 70°C temperature range. For greater accuracy see

DS32KHz data sheet.

14.

If the EOSC bit in the Control Register is set to a logic 1, t

RPU

is equal to 250 ms plus the start–up

time of the crystal oscillator.

1 2 ... 11 12 13 14 15 16 17

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