Texas Instruments TMP708 Evaluation Module TMP708EVM TMP708EVM Datenbogen
Produktcode
TMP708EVM
TMP708/709EVM Hardware Overview and Setup
2.4.3
SMD Pads and Pin Sockets for Rset
The test boards features SMD pads and pin sockets for Rset so that either a surface-mount resistor or a
through-hole resistor may be used to set the temperature threshold. The resistor value is determined by
through-hole resistor may be used to set the temperature threshold. The resistor value is determined by
:
Rset (k
Ω
) = 0.0012
×
T
2
−
0.9308
×
T + 96.147
where:
T is the temperature threshold in degrees Celsius.
(1)
2.5
LED Status Indicators
The status of the temperature switch may be monitored at a glance by the on-board LEDs. The
temperature threshold is set by Rset and the hysteresis setting. An illuminated green LED (as shown in
temperature threshold is set by Rset and the hysteresis setting. An illuminated green LED (as shown in
) indicates that the current temperature is below the threshold. An illuminated red LED (as shown
in
) indicates that the current temperature is above the threshold.
Figure 4. On-Board LEDs Indicating that Current Temperature is Below the Limit Set by Rset
Figure 5. On-Board LEDs Indicating that Current Temperature is Above the Limit Set by Rset
5
SBOU120
–
December 2011
TMP708/709EVM Evaluation Board and Software Tutorial
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2011, Texas Instruments Incorporated