Datasheet

MCP9804

5.2.3.2 Interrupt Mode

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

high or active-low (depending on the polarity configura-

tion) when T

drifts above or below T

UPPER

and T

LOWER

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 tem-

perature output only, using bit 2 of CONFIG.

This mode is 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

MCP9804.

5.2.4 TEMPERATURE RESOLUTION

The MCP9804 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

CONV

(ms)

Samples/sec

(typical)

+0.5°C 30 33

+0.25°C 65 15

+0.125°C 130 7

+0.0625°C

(Power-up Default)

250 4