MCP98243-BE/MC Microchip Technology, MCP98243-BE/MC Datasheet - Page 32

• Manufacturer Part Number: MCP98243-BE/MC
• Description: IC TEMP SENSOR 3V 2WIRE 8-DFN
• Manufacturer: Microchip Technology

Specifications of MCP98243-BE/MC

• Package / Case: 8-DFN
• Output Type: I²C™/SMBus™
• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 0.5°C
• Temperature Sensing Range: -40°C To +125°C
• Supply Current: 200µA
• Supply Voltage Range: 2.7V To 5.5V
• Sensor Case Style: DFN
• No. Of Pins: 8
• Rohs Compliant: Yes
• Resolution (bits): 8bit
• Supply Voltage Min: 3V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP98243
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, the device will retain the active
state during shutdown. This increases the shutdown
current due to the additional Event output 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 hysteresis bits can not be changed if either of the
lock bits, bits 6 and 7 of CONFIG, are set to ‘1’.
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 active-high output is selected, a pull-down resis-
tor is requried on the Event pin. When active-low output
is selected, a pull-up resistor is required on the Event
pin, see
cuit description. These configurations are designed to
serve processors with Low-to-High or High-to-Low
edge triggered inputs. With these configurations, when
the Event output De-asserts, power will not be dissi-
pated across the pull-up or pull-down resistors.
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.
DS22153A-page 32
UPPER
Figure 5-11
SENSOR FEATURE DESCRIPTION
UPPER
SHUTDOWN MODE
TEMPERATURE HYSTERESIS
(T
EVENT OUTPUT CONFIGURATION
, T
mode
HYST
LOWER
, T
)
disables
and
LOWER
and T
SHDN
Figure 5-12
Figure
. It remains in this mode
CRIT
and T
all
boundary conditions
5-2.
power-consuming
CRIT
for graphical cir-
temperate
FIGURE 5-11:
Configuration.
FIGURE 5-12:
Configuration.
The status of the Event output can be read using bit 4
of CONFIG (Event status). This bit can not be set to ‘1’
in shutdown mode.
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.
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
PER
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.
, T
UPPER
LOWER
Event Output
Event Output
, T
The
Comparator Mode
and T
LOWER
V
device
CRIT
DD
R
R
Active-Low Event Output
and T
Active-High Event Output
© 2009 Microchip Technology Inc.
PD
PU
boundary conditions need to
must
CRIT
CONV
MCP98243
MCP98243
registers. The bits
be
V
Figure 5-2
DD
; the T
operating
A
vs. T
shows
UP-
in