LM73

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SNIS141D – OCTOBER 2005 – REVISED MAY 2009

TEMPERATURE DATA FORMAT

The resolution of the temperature data and the size of the data word are user-selectable through bits RES1 and

RES0 in the CONTROL/STATUS REGISTER. By default, the LM73 temperature stores the measured

temperature in an 11-bit (10 bits plus sign) word with one least significant bit (LSB) equal to 0.25°C. The

maximum word size is 14 bits (13-bits plus sign) with a resolution of 0.03125 °C/LSB.

CONTROL BIT

DATA FORMAT

RES1

RES0

WORD SIZE

RESOLUTION

0

0

11 bits

0.25 °C/LSB

0

1

12 bits

0.125 °C/LSB

1

0

13 bits

0.0625 °C/LSB

1

1

14 bits

0.03125 °C/LSB

The temperature data is reported in 2's complement format. The word is stored in the 16-bit Temperature

Register and is left justified in this register. Unused temperature-data bits are always reported as "0".

Table 1. 11-bit (10-bit plus Sign)

Temperature

Digital Output

Binary

Hex

+150°C

0100 1011 0000 0000

4B00h

+25°C

0000 1100 1000 0000

0C80h

+1°C

0000 0000 1000 0000

0080h

+0.25°C

0000 0000 0010 0000

0020h

0°C

0000 0000 0000 0000

0000h

−0.25°C

1111 1111 1110 0000

FFE0h

−1°C

1111 1111 1000 0000

FF80h

−25°C

1111 0011 1000 0000

F380h

−40°C

1110 1100 0000 0000

EC00h

Table 2. 12-bit (11-bit plus Sign)

Temperature

Digital Output

Binary

Hex

+150°C

0100 1011 0000 0000

4B00h

+25°C

0000 1100 1000 0000

0C80h

+1°C

0000 0000 1000 0000

0080h

+0.125°C

0000 0000 0001 0000

0010h

0°C

0000 0000 0000 0000

0000h

−0.125°C

1111 1111 1111 0000

FFF0h

−1°C

1111 1111 1000 0000

FF80h

−25°C

1111 0011 1000 0000

F380h

−40°C

1110 1100 0000 0000

EC00h

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