DS1629S+T&R【PDF 15/23 页】IC THERM/RTC/CALENDAR DIG 8-SOIC

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Sheet目录39

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DS1629

15 of 23

COMMAND SET

The DS1629 command set is shown below.

Access Config [ACh]

If R/

is 0, this command writes to the configuration register. After issuing this command, the next data

byte value is to be written into the configuration register. If R/

is 1, the next data byte read is the value

stored in the configuration register. Because the MSB of the configuration register is read/write and the

LSB is read-only, the user only needs to write one byte to the register. One or two bytes can be read.

Start Convert T [EEh]

This command begins a temperature conversion. No further data is required. In one-shot mode, the

temperature conversion will be performed and then the DS1629 will remain idle. In continuous mode, this

command will initiate continuous conversions. Issuance of this protocol may not be required upon

DS1629 power-up, depending upon the state of the CNV bit in the configuration register.

Stop Convert T [22h]

This command stops temperature conversion. No further data is required. This command may be used to

halt a DS1629 in continuous conversion mode. After issuing this command, the current temperature

measurement will be completed, and then the DS1629 will remain idle until a Start Convert T is issued to

resume conversions.

Read Temperature [AAh]

This command reads the last temperature conversion result from the Thermometer Register in the format

described in the OperationMeasuring Temperature section. If ones application can accept

thermometer resolution of only 1.0癈, the master only must read the first data byte and follow with a

NACK and STOP. For higher resolution, both bytes must be read.

Read Counter [A8h]

This command returns the 8-bit COUNT_REMAIN value, used for high resolution thermometer

calculations.

Read Slope [A9h]

This command returns the 8-bit COUNT_PER_C value, used for high resolution thermometer

calculations.

Access Clock [C0h]

Accesses the DS1629 clock/calendar register. If R/

is 0, the master will write to the clock register (set

the clock). If R/

is 1, the clock register is read. The clock register is addressed, so the user must

provide a beginning byte address, whether a read or write is performed. A write to or read from this

protocol and Figure 2 for the clock register map.

Access Clock Alarm [C7h]

Accesses the DS1629 clock alarm register. If R/

is 0, the master will write to the clock alarm register

(set/ change the alarm). If R/

is 1, the clock alarm register is read. The clock alarm register is

addressed, so the user must provide a beginning byte address, whether a read or write is performed. A

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