LM92

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SNIS110D – MARCH 2000 – REVISED MARCH 2013

Table 2. Temperature Data Output (continued)

Temperature

Digital Output

Binary

Hex

+0.0625 °C

0 0000 0000 0001

00 01h

0 °C

00 0000 0000

00 00h

−0.0625 °C

1 1111 1111 1111

1F FFh

−25 °C

1 1110 0111 0000

1E 70h

−55 °C

1 1100 1001 0000

1C 90h

SHUTDOWN MODE

Shutdown mode is enabled by setting the shutdown bit in the Configuration register via the Serial Bus. Shutdown

mode reduces power supply current to 5 µA typical. T_CRIT_A is reset if previously set. Since conversions are

stopped during shutdown, T_CRIT_A and INT will not be operational. The Serial Bus interface remains active.

Activity on the clock and data lines of the Serial Bus may slightly increase shutdown mode quiescent current.

Registers can be read from and written to in shutdown mode. The LM92 takes milliseconds to respond to the

shutdown command.

INT AND T_CRIT_A OUTPUT

The INT and T_CRIT_A outputs are open-drain outputs and do not have internal pull-ups. A "high" level will not

be observed on these pins until pull-up current is provided from some external source, typically a pull-up resistor.

Choice of resistor value depends on many system factors but, in general, the pull-up resistor should be as large

as possible. This will minimize any errors due to internal heating of the LM92. The maximum resistance of the

pull up, based on LM92 specification for High Level Output Current, to provide a 2 volt high level, is 30K ohms.

FAULT QUEUE

A fault queue of 4 faults is provided to prevent false tripping when the LM92 is used in noisy environments. The 4

faults must occur consecutively to set flags as well as INT and T_CRIT_A outputs. The fault queue is enabled by

setting bit 4 of the Configuration Register high (see CONFIGURATION REGISTER ).

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