DS1775R7+T&R【PDF 4/14 页】IC THERMOM/STAT DIG 111 SOT-23-5

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Sheet目录39

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DS1775

4 of 14

Table 2. Temperature/Data Relationships

MSB

MSb

UNIT = 癈

LSb

-1

-2

-3

-4

LSB

TEMPERATURE

?SPAN class="pst DS1775R7-T-R_2292811_1">C

DIGITAL OUTPUT

BINARY

DIGITAL OUTPUT

HEX

+125

0111 1101 0000 0000

7D00h

+25.0625

0000 1010 0010 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

Thermostat Control

In its comparator operating mode, the DS1775 functions as a thermostat with programmable hysteresis, as

shown in Figure 2. When the DS1775s temperature meets or exceeds the value stored in the high

temperature trip register (T

) a consecutive number of times, as defined by the configuration register, the

output becomes active and stays active until the first time that the temperature falls below the temperature

stored in the low temperature trigger register (T

HYST

). In this way, any amount of hysteresis may be

obtained. The DS1775 powers up in the comparator mode with T

= +80癈 and T

HYST

= +75癈 and can

be used as a stand-alone thermostat (no 2-wire interface required) with those setpoints.

In the interrupt mode, the O.S. output first becomes active following the programmed number of

consecutive conversions above T

. The fault can only be cleared by either setting the DS1775 in a

shutdown mode or by reading any register (temperature, configuration, T

, or T

HYST

) on the device.

Following a clear, a subsequent fault can only occur if consecutive conversions fall below T

HYST

. This

interrupt/clear process is thus cyclical (T

, clear, T

HYST

, clear, T

HYST

, clear, etc.). Only the

first of multiple consecutive T

violations activates O.S., even if each fault is separated by a clearing

function. The same situation applies to multiple consecutive T

HYST

events.

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