Datasheet

LM76

SNIS109E –JANUARY 2000–REVISED MARCH 2013

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DEFAULT SETTINGS

The LM76 always powers up in a known state. LM76 power up default conditions are:

1. Comparator Interrupt Mode

2. T

LOW

set to 10°C

3. T

HIGH

set to 64°C

4. T_CRIT set to 80°C

5. T

HYST

set to 2°C

6. INT and T_CRIT_A active low

7. Pointer set to “00”; Temperature Register

The LM76 registers will always reset to these default values when the power supply voltage is brought up from

zero volts as the supply crosses the voltage level plotted in the following curve. The LM76 registers will reset

again when the power supply drops below the voltage plotted in this curve.

Figure 5. Average Power on Reset Voltage vs Temperature

SERIAL BUS INTERFACE

The LM76 operates as a slave on the Serial Bus, so the SCL line is an input (no clock is generated by the LM76)

and the SDA line is a bi-directional serial data line. According to Serial Bus specifications, the LM76 has a 7-bit

slave address. The five most significant bits of the slave address are hard wired inside the LM76 and are

“10010”. The two least significant bits of the address are assigned to pins A1–A0, and are set by connecting

these pins to ground for a low, (0); or to +V

for a high, (1).

Therefore, the complete slave address is:

1 0 0 1 0 A1 A0

MSB LSB

Product Folder Links: LM76