DS1626S+【PDF 9/12 页】IC THERMOMETER/STAT DIG 8-SOIC

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Sheet目录39

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DS1626/DS1726

9 of 12

CONFIGURATION REGISTER

The configuration register allows the user to customize the DS1626/DS1726 conversion and thermostat

options. It also provides information to the user about conversion status, EEPROM activity, and

thermostat activity. The configuration register is arranged as shown in Figure 6 and detailed descriptions

of each bit are provided in Table 3. This register can be accessed using the Read Config and Write Config

commands. Note that the R1, R0, CPU, and 1SHOT bits are stored in EEPROM and all other

configuration register bits are SRAM.

Figure 6. CONFIGURATION REGISTER

MSb

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

LSb

DONE

THF

TLF

NVB

R1*

R0*

CPU*

1SHOT*

*NV (EEPROM)

Table 3. CONFIGURATION REGISTER BIT DESCRIPTIONS

BIT NAME

(USER ACCESS)

FUNCTIONAL DESCRIPTION

DONE

(Read Only)

Power-up state = 1.

DONE = 0. Temperature conversion is in progress.

DONE = 1. Temperature conversion is complete.

THF

(Read/Write)

Power-up state = 0.

THF = 1. The measured temperature has reached or exceeded the value stored in the

power is cycled, or a Software POR command is issued.

TLF

(Read/Write)

Power-up state = 0.

TLF = 1. The measured temperature has equaled or dropped below the value stored

in the T

power is cycled, or a Software POR command is issued.

NVB

(Read Only)

Power-up state = 0.

NVB = 1. Write to an E

memory cell is in progress.

NVB = 0. NV memory is not busy.

R1*

(Read/Write)

Power-up state = last value written to this bit.

Sets conversion resolution (see Table 4).

Initial state from factory = 1.

R0*

(Read/Write)

Power-up state = last value written to this bit.

Sets conversion resolution (see Table 4).

Initial state from factory = 1.

CPU*

(Read/Write)

Power-up state = last value written to this bit.

CPU = 1. Stand-alone mode is disabled.

CPU = 0. Stand-alone mode is enabled when RST = 0. See CPU BIT AND STAND-

ALONE THERMOSTAT OPERATION section for more information.

Initial state from factory = 0.

1SHOT*

(Read/Write)

Power-up state = last value written to this bit.

1SHOT = 1: One-Shot Mode. The Start Convert T command initiates a single

temperature conversion and then the device goes into a low-power standby state.

1SHOT = 0: Continuous Conversion Mode. The Start Convert T command initiates

continuous temperature conversions.

Initial state from factory = 0.

*NV (EEPROM)

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