DS1775R7+T&R【PDF 6/14 页】IC THERMOM/STAT DIG 111 SOT-23-5

DS1775

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temperature register. The pointer address must always precede data in writing to a register, regardless of

which address is currently selected. See the 2-Wire Serial Data Bus section for details of the 2-wire bus

protocol.

Configuration Register Programming

The configuration register is accessed if the DS1775 pointer is currently set to the 01h location. Writing

to or reading from the register is determined by the R/W 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 Table 4. The effect each bit has on DS1775 functionality is described below

along with the power-up state of the bit. The user has read/write access to all bits in the configuration

Table 4. Configuration/Status Register

POL

MSb

LSb

SD = Shutdown bit. If SD is 0, the DS1775 continuously performs temperature conversions and stores

the last completed result in the thermometer register. If SD is changed to 1, the conversion in progress is

completed and stored; then the device reverts to a low-power standby mode. The O.S. output is cleared if

the device is in the interrupt mode and remains unchanged in the comparator mode. The 2-wire port

remains active. The power-up default state is 0 (continuous conversion mode).

TM = Thermostat mode. If TM = 0, the DS1775 is in the comparator mode. TM = 1 sets the device to the

interrupt mode. See the Thermostat Control section for a description of the difference between the two

modes. The power-up default state of the TM bit is 0 (comparator mode).

POL = O.S. Polarity Bit. If POL = 1, the active state of the O.S. output is high. A 0 stored in this location

sets the thermostat output to an active-low state. The user has read/write access to the POL bit, and the

power-up default state is 0 (active low).

F0, F1 = O.S. Fault Tolerance bits. The fault tolerance defines the number of consecutive conversions

returning a temperature beyond limits is required to set the O.S. output in an active state. This may be

necessary to add margin in noisy environments. Table 5 defines the four settings. The DS1775 powers up

with F0 = F1 = 0, such that a single occurrence triggers a fault.

Table 5. Fault Tolerance Configuration

F1 F0

CONSECUTIVE CONVERSIONS BEYOND LIMITS

TO GENERATE FAULT

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