The temperature indicator circuit operates in either high or low range. The high
range, selected by setting the TSRNG bit, provides a wider output voltage. This provides more
resolution over the temperature range. High range requires a higher bias voltage to
operate and thus, a higher VDD is needed. The low range is selected by
clearing the TSRNG bit. The low range generates a lower sensor voltage and thus, a lower
VDD voltage is needed to operate the circuit.
The output voltage of the sensor is the highest value at
-40℃ and the lowest value at
+125℃.
- High Range: The high range
is used in applications with the reference for the ADC, VREF =
2.048V. This range may not be suitable for battery-powered applications.
- Low Range: This mode is
useful in applications in which the VDD is too low for high-range
operation. The VDD in this mode can be as low as 1.8V. However, VDD must be at least 0.5V higher than the
maximum sensor voltage depending on the expected low operating temperature.
Important: The standard
parameters for the Temperature Indicator for both high range and low range are stored in
the DIA table. Refer to the DIA table in the “Memory Organization” chapter for
more details. Additionally, the Temperature Indicator sensitivity parameter
(MV) for both high range and low range is located in the “Electrical
Specifications” section.