Microchip Technology TMPSNSRD-TCPL1 データシート
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© 2009-2012 Microchip Technology Inc.
DS22203C-page 31
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
high or active-low (depending on the polarity configura-
tion) when T
A
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.
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.
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
(
data with +0.5°C to +0.0625°C resolution. The resolu-
tion can be selected using the Resolution register
(
). 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.
resolution is set as a POR default by the factory.
TABLE 5-2:
TEMPERATURE
CONVERSION TIME
CONVERSION TIME
Resolution
t
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