Texas Instruments | Temperature sensing for notebook PCs | Selection guides | Texas Instruments Temperature sensing for notebook PCs Selection guides

Texas Instruments Temperature sensing for notebook PCs Selection guides
Temperature sensing for
notebook PCs
Notebook personal computers (PC) have become
drastically thinner and smaller, while increasing graphic
and computing capabilities. These changes contribute
to more heat being generated throughout the system
in a smaller space, creating a need for monitoring
temperature to prevent overheating.
Commonly used types of temperature sensors are
local temperature sensors and temperature switches.
Local temperature sensors monitor the temperature at
the location in which they are placed and report back
to a microcontroller which can take steps to reduce
the heat.
Temperature switches provide an alert when a
fixed threshold is crossed, removing the need for a
microcontroller. The temperature switch threshold can
be factory-programmed, pin-selected, or
resistor-programmed which allows for a hardware
only shut-down circuit.
In addition to monitoring the temperature of the circuit,
it is also important to monitor the temperature of the
charging device, especially with USB-C interfaces as
they support much higher current output than older
USB interfaces.
Part number
Figure 1. Notebook PC
The TMP102, TMP103, and TMP108 local digital
temperature sensors are well-suited for notebook
PCs due to their small size and low power.
The TMP709 and TMP302 temperature switches
are also a good fit for notebook PCs, again due to
their small size and low-power.
See table below for more details on these devices.
Interface
Accuracy (max)
Operating range
Supply range
Package type
Package footprint
TMP102
2
I C / SMBUS
±2°C
-40°C to 125°C
1.4 V to 3.6 V
SOT-563
1.60 x 1.60 mm
TMP103
I2C / SMBUS
±2°C
-40°C to 125°C
1.4 V to 3.6 V
DSBGA
0.76 x 0.76 mm
TMP108
2
I C / SMBUS
±0.75°C
-40°C to 125°C
1.4 V to 3.6 V
DSBGA
1.20 x 0.80 mm
TMP709
n/a
±3°C
0°C to 125°C
2.7 V to 5.5 V
SOT-23
2.90 x 1.60 mm
TMP302
n/a
±2°C
-40°C to 125°C
1.4 V to 3.6 V
SOT-563
1.60 x 1.60 mm
SLYM104
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