DS1775R/TR1 DALLAS [Dallas Semiconductor], DS1775R/TR1 Datasheet - Page 5

• Manufacturer Part Number: DS1775R/TR1
• Description: SOT23-5 Digital Thermometer and Thermostat
• Manufacturer: DALLAS [Dallas Semiconductor]

O.S. OUTPUT TRANSFER FUNCTION Figure 2
Regardless of the mode chosen, the O.S. output is open–drain and the active state is set in the
configuration register. The power–up default is active low. Refer to the “OPERATION–Programming”
section for instructions in adjusting the thermostat setpoints, thermostat mode, and O.S. active state.
OPERATION–Programming
There are three areas of interest in programming the DS1775: the configuration register, the T
and the T
appropriate location. Table 3 illustrates the pointer settings for the four registers of the DS1775.
Pointer Register Structure Table 3
The DS1775 will power up with the temperature register selected. If the host wishes to change the data
pointer it simply addresses the DS1775 in the write mode (R/
the 8 bits that correspond to the new desired location. The last pointer location is always maintained so
that consecutive reads from the same register do not require the host to always provide a pointer address.
POINTER
00h
01h
02h
03h
HYST
register. All programming is done via the 2–wire interface by setting the pointer to the
ACTIVE REGISTER
Temperature (default)
Configuration
T
T
HYST
OS
5 of 13
W
=0), receives an acknowledge, and writes
102299
OS
register,
DS1775