DS1629S+T&R【PDF 10/23 页】IC THERM/RTC/CALENDAR DIG 8-SOIC

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Sheet目录39

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DS1629

10 of 23

Thermometer Power-Up Modes Table 5

I H

M DE

Powers u convertin continuousl factor default

Automatically performs one conversion upon power-up. Subsequent conversions

re uire a Start Convert T command.

Powers up in standby; upon Start Convert T command, conversions will be performed

continuousl .

Powers up in standby; upon Start Convert T command, a single conversion will be

erformed and stored.

A0, A1 = Alarm Mode. Table 6 defines the DS1629 alarm mode, based on the settings of the A0 and A1

bits. These bits define what event will activate the ALRM output. The alarm flagsCAF, TAF, CAL,

TALare functional regardless of the state of these bits. Both locations are read/write and nonvolatile,

and the factory default state disables the ALRM output (A0 = A1 = 0).

Alarm Mode Configuration Table 6

ALARM MODE

Neither Thermal or Time Disabled

Th rm l nl

Time Onl

Either Thermal or Time

OS0, OS1 = Oscillator Output Setting. Table 7 defines the frequency of the OSC output, as defined by

the settings of these bits. Both locations are read/write and nonvolatile, and the factory default state sets

the OSC frequency equal to the crystal frequency (OS0 = OS1 = 1). The output should be disabled if the

user does not intend to use it to reduce power consumption.

OSC Frequency Configuration Table 7

OS1 OS0

OSC FRE UENCY

Disabled

1/8f

1/4f

CAF = Clock Alarm Flag. This volatile status bit will be set to 1 when the clock comparator is in an

active state. Once set, it will remain 1 until reset by writing to or reading from either the clock register or

clock alarm register. A 0 in this location indicates the clock is not in an alarm condition. This is a read-

only bit (writes to this location constitute a dont care) and the power-up default is the flag cleared (CAF

= 0).

TAF = Thermal Alarm Flag. This volatile status bit will be set to 1 when the thermal comparator is in an

active state. Once set, it will remain 1 until measured temperature falls below the programmed TL setting.

A 0 in this location indicates the thermometer is not in an alarm condition. This is a read-only bit (writes

to this location constitute a dont care) and the power-up default is the flag cleared (TAF = 0).

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