MCP98243-BE/ST Microchip Technology, MCP98243-BE/ST Datasheet - Page 33

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

Specifications of MCP98243-BE/ST

• Package / Case: 8-TSSOP
• 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
• Temperature Threshold: + 125 C
• Full Temp Accuracy: 1 C
• Digital Output - Bus Interface: 2-Wire, SMBus, I2C
• Digital Output - Number Of Bits: 8 bit
• Supply Voltage (max): 6 V
• Supply Voltage (min): 1.8 V
• Description/function: Thermal Management ICs
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Supply Current: 100 uA to 1100 uA
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 0.5°C
• Temperature Sensing Range: -40°C To +125°C
• Supply Voltage Range: 2.7V To 5.5V
• Sensor Case Style: TSSOP
• 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

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
rupt clear bit (Bit 5) is never set, then the Event output will
re-assert after the first temperature conversion.
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 MCP9843/98243.
© 2009 Microchip Technology Inc.
LOWER
A
A
must satisfy the T
< T
CONV
limits. The output is deasserted by setting
Comparator Mode
Interrupt Mode
CRIT
A
>= T
. After the initial temperature conver-
- T
CRIT
A
Figure 5-12
HYST
drifts above or below T
the Event output is forced as
UPPER
. Otherwise, Event output
or T
for graphical descrip-
Figure 5-12
A
LOWER
CONV
< T
CRIT
. If the inter-
boundary
- T
shows
UPPER
HYST
.
5.2.4
The MCP9843/98243 device is capable of providing a
temperature data with 0.5°C to 0.0625°C resolution.
The Resolution can selected using the Resolution
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
(max.). The selected resolution can be read by user
using bit 4 and bit 3 of the Capability register
(Register
default by factory.
TABLE 5-2:
(Power-up default)
Resolution
0.0625°C
0.125°C
0.25°C
0.5°C
(Register
5-2). A 0.25°C resolution is set as POR
TEMPERATURE RESOLUTION
MCP9843/98243
TEMPERATURE
CONVERSION TIME
5-9) which is located in address
t
(ms)
CONV
130
260
30
65
DS22153C-page 33
Samples/sec
(typical)
33
15
8
4