Datasheet

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

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)