(
)
85 30
Temp
ADC(raw) CAL _ ADC _ T30
30
CAL _ ADC _ T85 CAL _ ADC _ T30
æ
ö
-
=
-
´
+
ç
÷
-
è
ø
SENSE
SENSOR
SENSOR
V
TC
Temp
V
=
´
+
(
)
85 30
Temp
ADC(raw) CAL _ ADC _ T30
30
CAL _ ADC _ T85 CAL _ ADC _ T30
æ
ö
-
=
-
´
+
ç
÷
-
è
ø
SENSE
SENSOR
SENSOR
V
TC
Temp
V
=
´
+
15
1
ADC(gain _ corrected)
ADC(raw) CAL _ ADC _ GAIN _ FACTOR
2
ADC(final)
ADC(gain _ corrected) CAL _ ADC _ OFFSET
=
´
´
=
+
Device Descriptor Table
83
SLAU208Q – June 2008 – Revised March 2018
Copyright © 2008–2018, Texas Instruments Incorporated
System Resets, Interrupts, and Operating Modes, System Control Module
(SYS)
(7)
1.13.5.3 Temperature Sensor Calibration for Devices With ADCx
The temperature sensor is calibrated using the internal voltage references. Each reference voltage
(1.5/2.0/2.5 V) contains a measured value for two temperatures, 30°C ±3°C and 85°C ±3°C and are stored
in the TLV structure. The characteristic equation of the temperature sensor voltage, in mV is:
(8)
The temperature coefficient, TC
SENSOR
in mV/°C, represents the slope of the equation. V
SENSOR
, in mV,
represents the y-intercept of the equation. Temp, in °C, is the temperature of interest.
The temperature (Temp, °C) can be computed as follows for each of the reference voltages used in the
ADC measurement:
(9)
1.13.6 Temperature Sensor Calibration for Devices With CTSD16
The temperature sensor is calibrated using the internal V
REFBG
voltage reference. A value for two
temperatures, 30°C ±3°C and 85°C ±3°C, is stored in the TLV structure. The characteristic equation of the
temperature sensor voltage, in mV is:
(10)
The temperature coefficient, TC
SENSOR
in mV/°C, represents the slope of the equation. V
SENSOR
, in mV,
represents the y-intercept of the equation. Temp, in °C, is the temperature of interest.
The temperature (Temp, °C) can be computed as follows:
(11)