DS1629S+T&R【PDF 9/23 页】IC THERM/RTC/CALENDAR DIG 8-SOIC

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Sheet目录39

5页 6页 7页 8页 [9页]10页 11页 12页 13页

DS1629

9 of 23

SRAM FORMAT Table 4

BYTE

TE T

00h

SRAM BYTE 0

01h

SRAM BYTE 1

RAM BYTE 2

. . .

1Eh

SRAM BYTE 30

1Fh

SRAM BYTE 31

CLOCK ALARM REGISTER FORMAT Figure 4

OPERATIONCONFIGURATION/STATUS REGISTER

The configuration/status register is accessed via the Access Config (ACh) function command. Writing to

or reading from the register is determined by the R/

bit of the 2-wire control byte (see the 2-Wire

Serial Data Bus section). Data is read from or written to the configuration register MSb first. The format

of the register is illustrated in Figure 5. The effect each bit has on DS1629 functionality is described

along with the power-up state and volatility. The user has read/write access to the MSB and read-only

access to the LSB of the register.

Configuration/Status Register Figure 5

OS1

OS0

CNV

POL

1SH

MSB

MSb

LSb

TAF

TAL

L B

1SH = Temperature Conversion Mode. If 1SHOT is 1, the DS1629 will perform one temperature

conversion upon reception of the Start Convert T protocol. If 1SHOT is 0, the DS1629 will continuously

perform temperature conversions and store the last completed result in the Thermometer Register. The

user has read/ write access to the nonvolatile bit, and the factory default state is 0 (continuous mode).

POL = ALRM Polarity Bit. If POL = 1, the active state of the ALRM output will be high. A 0 stored in

this location sets the thermostat output to an active-low state. The user has read/write access to the

nonvolatile POL bit, and the factory default state is 0 (active low).

CNV = Power-up conversion state. If CNV = 0 (factory default), the DS1629 will automatically initiate a

temperature conversion upon power-up and supply stability. Setting CNV = 1 causes the DS1629 to

power up in a standby state. Table 5 illustrates how the user can set 1SH and CNV, depending on the

power consumption sensitivity of the application.

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