DS75 datasheet(7/13 Pages) DALLAS

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DS75

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Thermometer Resolution Configuration

Table 5

Thermometer

Resolution

Max Conversion

Time

9–bit

0.15s

10–bit

0.3s

11–bit

0.6s

12–bit

1.2s

Thermostat Setpoints Programming

The thermostat registers (TOS and THYST ) can be programmed or read via the 2–wire interface. TOS is

accessed by setting the DS75 data pointer to the 03h location, and that for the THYST setting is 02h.

The format of the TOS and THYST registers is identical to that of the Thermometer register; that is, 12–bit

2’s complement representation of the temperature in

°C. The user can program the number of bits (9, 10,

11, or 12) for each TOS and THYST that correspond to the thermometer resolution mode chosen. If the 9–bit

mode is chosen, for example, the 3 least significant bits of TOS and THYST will be ignored by the

thermostat comparator. The format for both TOS and THYST is shown below in Table 6. The power–up

default of TOS is 80

°C and that for T

HYST is 75

°C.

Thermostat Setpoint (TOS/THYST) Format

Table 6

MSB

MSb

(UNIT =

°C)

LSb

–1

–2

–3

–4

LSB

TEMPERATURE/DATA RELATIONSHIPS

TEMP

DIGITAL OUTPUT

(Binary)

DIGITAL

OUTPUT

(Hex)

+80

°C

0101 0000 0000 0000

5000h

+75

°C

0100 1011 0000 0000

4B00h

+10.125

°C

0000 1010 0010 0000

0A20h

+0.5

°C

00000000 1000 0000

0080h

°C

00000000 0000 0000

0000h

–0.5

°C

1111 1111 1000 0000

FF80h

–10.125

°C

1111 0101 1110 0000

E5E0h

–25.0625

°C

1110 0110 1111 0000

E6F0h

–55

°C

1100 1001 0000 0000

C900h

If the user does not wish to take advantage of the thermostat capabilities of the DS75, the 24 bits can be

used for general storage of system data that need not be maintained following a power loss. The O.S.

output should be left floating if this is done.

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