MCP9808 datasheet(31/52 Pages) MICROCHIP

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DS25095A-page 31

MCP9808

5.2.3.2

Interrupt Mode

In Interrupt mode, the Alert output is asserted as active-

high

active-low

(depending

the

polarity

configuration) when TA drifts above or below TUPPER

and TLOWER limits. The output is deasserted by setting

bit 5 (Interrupt Clear bit) of CONFIG. Shutting down the

device will not reset or deassert the Alert output. This

mode can not be selected when the Alert output is used

as a critical temperature output only, using bit 2 of

CONFIG.

This

mode

designed

for

interrupt

driven

microcontroller-based systems. The microcontroller

receiving the interrupt will have to Acknowledge the

interrupt by setting bit 5 of the CONFIG register from the

MCP9808.

5.2.4

TEMPERATURE RESOLUTION

The MCP9808 is capable of providing temperature

data with +0.5°C to +0.0625°C resolution. The resolu-

tion can be selected using the Resolution register

(Register 5-7). It is located at address, ‘00001000’b,

and it provides measurement flexibility. A +0.0625°C

resolution is set as a POR default by the factory.

TABLE 5-2:

TEMPERATURE

CONVERSION TIME

Resolution

tCONV

(ms)

Samples/sec

(typical)

+0.5°C

+0.25°C

+0.125°C

130

+0.0625°C

(Power-up Default)

250

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