MCP9808
5.2.3.2
Interrupt Mode
5.2.4
TEMPERATURE RESOLUTION
In Interrupt mode, the Alert output is asserted as active-
high or active-low (depending on 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.
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
tCONV
(ms)
Samples/sec
(typical)
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
MCP9808.
Resolution
+0.5°C
+0.25°C
+0.125°C
30
65
33
15
7
130
250
+0.0625°C
4
(Power-up Default)
© 2011 Microchip Technology Inc.
DS25095A-page 31
MICROCHIP [ MICROCHIP ]
