DS1775R1-TR 查看數據表（PDF） - Maxim Integrated

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DS1775R1-TR

Digital Thermometer and Thermostat in SOT23

Maxim Integrated 

DS1775

Digital Thermometer and Thermostat in SOT23

the device. Following a clear, a subsequent fault can only

occur if consecutive conversions fall below THYST. This

interrupt/clear process is thus cyclical (TOS, clear, THYST,

clear, TOS, clear, THYST, clear, etc.). Only the first of

multiple consecutive TOS violations activates O.S., even

if each fault is separated by a clearing function. The same

situation applies to multiple consecutive THYST events.

Regardless of the mode chosen, the O.S. output is

open-drain and the active state is set in the configura-

tion register. The power-up default is active low. See the

Programming section for instructions in adjusting the ther-

mostat setpoints, thermostat mode, and O.S. active state.

Programming

There are three areas of interest in programming the

DS1775: the configuration register, the TOS register, and

the THYST register. All programming is done via the 2-wire

interface by setting the pointer to the appropriate location.

Table 2 illustrates the pointer settings for the four registers

of the DS1775.

TOS

MEASURED

TEMPERATURE

THYST

INACTIVE

O.S.

OUTPUT

ACTIVE

CONVERSIONS

COMPARATOR MODE

INACTIVE

O.S.

OUTPUT

ACTIVE

CONVERSIONS

INTERRUPT MODE

ASSUMES A READ

HAS OCCURRED

THIS TRANSFER FUNCTION ASSUMES THE DS1775 IS CONFIGURED SUCH THAT 2

CONSECUTIVE CONVERSIONS OUT OF TOLERANCE CONSTITUTE AND O.S. FAULT

Figure 2. O.S. Output Transfer Function

Table 2. Pointer Register Structure

POINTER

00h

01h

02h

03h

ACTIVE REGISTER

Temperature (default)

Configuration

THYST

TOS

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