MCP98243-BE/MNY MICROCHIP [Microchip Technology], MCP98243-BE/MNY Datasheet - Page 33

• Manufacturer Part Number: MCP98243-BE/MNY
• Description: Memory Module Temperature Sensor w/ EEPROM for SPD
• Manufacturer: MICROCHIP [Microchip Technology]

5.2.3.1
Comparator mode is selected using bit 0 of CONFIG. In
this mode, the Event output is asserted as active-high
or active-low using bit 1 of CONFIG.
the conditions that toggle the Event output.
If the device enters Shutdown mode with asserted
Event output, the output will de-assert. It will remain de-
asserted until the device enters Continuous Conver-
sion mode and after the first temperature conversion is
completed, t
sion, T
conditions in order for Event output to be asserted.
Comparator mode is useful for thermostat-type
applications, such as turning on a cooling fan or
triggering a system shutdown when the temperature
exceeds a safe operating range.
5.2.3.2
In the Interrupt mode, the Event output is asserted as
active-high or active-low (depending on the polarity
configuration) when T
and T
bit 5 (Interrupt Clear) of CONFIG. If the device enters
Shutdown mode with asserted Event output, the output
will de-assert. It will remain de-asserted until the device
enters Continuous Conversion mode and after the first
temperature conversion is completed, t
initial temperature conversion, T
or T
to be asserted.
In addition, if T
Comparator mode and asserts until T
While the Event output is asserted, user must send Clear
Interrupt command (bit 5 of CONFIG) for Event output to
de-assert, when temperature drops below the critical
limit, T
remains asserted (see
tion). Switching from Interrupt mode to Comparator mode
also de-asserts Event output.
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 CONFIG register from the MCP98243.
© 2009 Microchip Technology Inc.
LOWER
LOWER
A
A
must satisfy the T
< T
boundary conditions in order for Event output
CONV
limits. The output is deasserted by setting
Comparator Mode
Interrupt Mode
CRIT
A
>= T
. After the initial temperature conver-
- T
CRIT
A
Figure 5-13
HYST
drifts above or below T
the Event output is forced as
UPPER
. Otherwise, Event output
A
must cross the T
or T
for graphical descrip-
Figure 5-13
A
LOWER
< T
CONV
CRIT
. After the
boundary
- T
shows
UPPER
UPPER
HYST
.
5.2.4
The MCP98243 is capable of providing a temperature
data with 0.5°C to 0.0625°C resolution. The Resolution
can selected using the Resolution register
8) which is located in address ‘00001000’b. This
address location is not specified in JEDEC Standard
JC42.4. However, it provides additional flexibility while
being functionally compatible with JC42.4 and provide
a 0.25°C resolution at 125 ms (max.). The selected
resolution can be read by user using bit 4 and bit 3 of
the Capability register
resolution is set as POR default by factory.
TABLE 5-2:
(Power-up default)
Resolution
0.0625°C
0.125°C
0.25°C
0.5°C
TEMPERATURE RESOLUTION
TEMPERATURE
CONVERSION TIME
t
MCP98243
(Register
(ms)
CONV
130
260
30
65
DS22153B-page 33
5-2). A 0.25°C
Samples/sec
(typical)
(Register 5-
33
15
8
4