C8051F300-TB Silicon Laboratories Inc, C8051F300-TB Datasheet - Page 37

• Manufacturer Part Number: C8051F300-TB
• Description: BOARD PROTOTYPING W/C8051F300
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F300-TB

• Contents: Board
• Data Bus Width: 8 bit
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F300
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The uncalibrated temperature sensor output is extremely linear and suitable for relative temperature mea-
surements (see Table 5.1 for linearity specifications). For absolute temperature measurements, gain and/
or offset calibration is recommended. Typically a 1-point calibration includes the following steps:
Figure 5.3 shows the typical temperature sensor error assuming a 1-point calibration at 25 °C. Note that
parameters which affect ADC measurement, in particular the voltage reference value, will also
affect temperature measurement.
Step 1. Control/measure the ambient temperature (this temperature must be known).
Step 2. Power the device, and delay for a few seconds to allow for self-heating.
Step 3. Perform an ADC conversion with the temperature sensor selected as the positive input
Step 4. Calculate the offset and/or gain characteristics, and store these values in non-volatile
Figure 5.2. Typical Temperature Sensor Transfer Function
and GND selected as the negative input.
memory for use with subsequent temperature sensor measurements.
1200
1100
1000
(mV)
900
800
700
-50
0
Rev. 2.9
V
TEMP
50
= 3.35*(TEMP
C8051F300/1/2/3/4/5
C
100
) + 897 mV
(Celsius)
37