MCP98242T-CE/MC Microchip Technology, MCP98242T-CE/MC Datasheet - Page 28

• Manufacturer Part Number: MCP98242T-CE/MC
• Description: JEDEC DIMM Serial Output Temp Sensor + SPD EEPROM 8 DFN 2X3mm T/R
• Manufacturer: Microchip Technology

Specifications of MCP98242T-CE/MC

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Full Temp Accuracy: +/- 2 C
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCP98242T-CE/MCTR

MCP98242
5.2
5.2.1
Shutdown
activities (including temperature sampling operations)
while leaving the serial interface active. This mode is
selected by setting bit 8 of CONFIG to ‘1’. In this mode,
the device consumes I
until bit 8 is cleared ‘0’ to enable Continuous
Conversion mode, or until power is recycled.
The Shutdown bit (bit 8) cannot be set to ‘1’ while bits
6 and 7 of CONFIG (Lock bits) are set to ‘1’. However,
it can be cleared ‘0’ or returned to Continuous
Conversion while locked.
In Shutdown mode, all registers can be read or written.
However, the serial bus activity increases the shutdown
current. In addition, if the device is shutdown while the
Event pin is asserted as active-low or deasserted
active-low (see
the device will retain the active-low state. This
increases the shutdown current due to the additional
Event output pull-down current.
5.2.2
A hysteresis of 0°C, 1.5°C, 3°C or 6°C can be selected
for the T
boundaries using bits 10 and 9 of CONFIG. The
hysteresis applies for decreasing temperature only (hot
to cold), or as temperature drifts below the specified
limit.
The T
are described graphically in
5.2.3
The Event output can be enabled using bit 3 of
CONFIG (Event output control bit) and can be
configured as either a comparator output or as Interrupt
Output mode using bit 0 of CONFIG (Event mode). The
polarity can also be specified as an active-high or
active-low using bit 1 of CONFIG (Event polarity).
When the ambient temperature increases above the
critical temperature limit, the Event output is forced to a
comparator output (regardless of bit 0 of CONFIG).
When the temperature drifts below the critical
temperature limit minus hysteresis, the Event output
automatically returns to the state specified by bit 0 of
CONFIG.
The status of the Event output can be read using bit 4
of CONFIG (Event status).
Bit 7 and 6 of the CONFIG register can be used to lock
the T
prevent false triggers at the Event output due to an
accidental rewrite to these registers.
DS21996D-page 28
UPPER
UPPER
SENSOR FEATURE DESCRIPTION
UPPER
SHUTDOWN MODE
TEMPERATURE HYSTERESIS
(T
EVENT OUTPUT CONFIGURATION
, T
, T
mode
HYST
LOWER
LOWER
Section 5.2.3.1 “Comparator
, T
)
disables
LOWER
and T
and T
SHDN
Figure
. It remains in this mode
CRIT
CRIT
and T
all
boundary conditions
5-2.
registers. The bits
power-consuming
CRIT
temperate
Mode”),
The Event output can also be used as a critical
temperature output using bit 2 of CONFIG (critical
output only). When this feature is selected, the Event
output becomes a comparator output. In this mode, the
interrupt output configuration (bit 0 of CONFIG) is
ignored.
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 remains asserted during
Shutdown.
Continuous Conversion mode for t
T
to be satisfied in order for the Event output to deassert.
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. Note that when
switching from Comparator mode to Interrupt mode, it
is recommended to send interrupt clear command (set
bit 5) to reset the interrupt flag. Shutting down the
device will not reset or deassert the Event output. This
mode cannot be selected when the Event output is
used as critical temperature 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 CONFIG register from the
MCP98242.
5.2.3.3
The MCP98242 is capable of providing a temperature
data with 0.5°C to 0.0625°C resolution. The Resolution
can be selected using the Resolution register
(Register
‘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
(maximum). The selected resolution can be read by
user using bit 4 and bit 3 of the Capability register
(Register
default by factory.
UPPER
LOWER
, T
5-8)
5-2). A 0.25°C resolution is set as POR
LOWER
limits. The output is deasserted by setting
The
Comparator Mode
Interrupt Mode
Temperature Resolution
which
and T
device
A
CRIT
 2010 Microchip Technology Inc.
drifts above or below T
is
must
boundary conditions need
located
be
CONV
Figure 5-2
operating
in
; the T
address
shows
UPPER
A
vs.
in