DS75U+T&R【PDF 7/14 页】IC THERMOMETER/STAT DIG 8-MSOP

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DS75

7 of 14

Figure 3. TEMPERATURE, T

, and T

bit 15

bit 14

bit 13

bit 12

bit 11

bit 10

bit 9

bit 8

MS Byte

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

LS Byte

-1

-2

-3

-4

Table 3. 12-BIT RESOLUTION TEMPERATURE/DATA RELATIONSHIP

TEMPERATURE

(?/SPAN>C)

DIGITAL OUTPUT

(BINARY)

DIGITAL OUTPUT

(HEX)

+125

0111 1101 0000 0000

7D00h

+25.0625

0001 1001 0001 0000

1910h

+10.125

0000 1010 0010 0000

0A20h

+0.5

0000 0000 1000 0000

0080h

0000 0000 0000 0000

0000h

-0.5

1111 1111 1000 0000

FF80h

-10.125

1111 0101 1110 0000

F5E0h

-25.0625

1110 0110 1111 0000

E6F0h

-55

1100 1001 0000 0000

C900h

SHUTDOWN MODE

For power-sensitive applications, the DS75 offers a low-power shutdown mode. The SD bit in the

configuration register controls shutdown mode. When SD is changed to 1, the conversion in progress

will be completed and the result stored in the temperature register after which the DS75 will go into a

low-power standby state. The O.S. output will be cleared if the thermostat is operating in interrupt mode

and O.S will remain unchanged in comparator mode. The 2-wire interface remains operational in

shutdown mode, and writing a 0 to the SD bit returns the DS75 to normal operation.

OPERATIONTHERMOSTAT

The DS75 thermostat has two operating modes, comparator mode and interrupt mode, which activate and

deactivate the open-drain thermostat output (O.S.) based on user-programmable trip-points (T

and

HYST

). The DS75 powers up with the thermostat in comparator mode with active-low O.S. polarity and

with the over-temperature trip-point (T

) register set to 80癈 and the hysteresis trip-point (T

HYST

)

as a standalone thermostat (i.e., no 2wire communication required). If interrupt mode operation, active-

high O.S. polarity or different T

and T

HYST

values are desired, they must be programmed after power-

up, so standalone operation is not possible.

In both operating modes, the user can program the thermostat fault tolerance, which sets how many

consecutive temperature readings (1, 2, 4, or 6) must fall outside of the thermostat limits before the

thermostat output is triggered. The fault tolerance is set by the F1 and F0 bits in the configuration and at

power-up the fault tolerance is 1.

The data format of the T

and T

HYST

registers is identical to that of the temperature register (see Figure

3), i.e., a two-byte twos complement representation of the trip-point temperature in degrees centigrade

with bits 3 through 0 hardwired to 0. After every temperature conversion, the measured temperature is

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