LM80 datasheet(16/29 Pages) NSC

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Functional Description (Continued)

7.0 TEMPERATURE MEASUREMENT SYSTEM

The LM80 bandgap type temperature sensor and ADC per-

form 9-bit or a 12-bit two’s-complement conversions of the

temperature. An 8-bit digital comparator is also incorporated

that compares the readings to the user-programmable Hot

and Overtemperature setpoints, and Hysteresis values.

7.1 Temperature Data Format

Temperature data can be read from the Temperature, T

hot,

hot hyst

os and Tos hyst setpoint registers; and written to the

hot,Thot hyst,Tos and Tos hyst setpoint registers. Thot set

point, T

hot hyst set point, Tos set point and Tos hyst tempera-

ture data is represented by an 8-bit, two’s complement word

with an LSB (Least Significant Bit) equal to 1˚C:

Temperature

Digital Output

Binary

Hex

+125˚C

0111 1101

7Dh

+25˚C

0001 1001

19h

+1.0˚C

0000 0001

01h

+0˚C

0000 0000

00h

−1.0˚C

1111 1111

FFh

−25˚C

1110 0111

E7h

−55˚C

1100 1001

C9h

DS100040-20

(Non-Linear Scale for Clarity)

FIGURE 8. 9-bit Temperature-to-Digital Transfer

Function

DS100040-16

(Non-Linear Scale for Clarity)

FIGURE 9. 12-bit Temperature-to-Digital Transfer

Function

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