NXP Semiconductors MPC5644A, Reference Manual, Page: 1232 / 1735

Temperature Sensor
MPC5644A Microcontroller Reference Manual, Rev. 6
1232 Freescale Semiconductor
27.3.3 V
BG_CODE
(T
LOW
)
V
BG_CODE
(T
LOW
) is the value of the bandgap voltage sampled during low temperature factory calibration.
This value is stored in shadow flash memory during factory calibration. See Section 27.3.6.2, Temperature
Calculation Constants Register 1 (TSENS_TCCR1) , for details.
27.3.4 Temperature sensor voltage (V
TENS
(T))
V
TENS
(T) is the output voltage of the device temperature sensor. Software must sample the voltage from
eQADC_A channel 128 (ADC0 and ADC1).
27.3.5 Bandgap reference voltage (V
BG_CODE
(T))
V
BG
is the bandgap reference voltage. Software must sample the voltage from eQADC_A channel 144
(ADC0).
27.3.6 Registers
The calibration constants described previously, that is, T
LOW
, T
HIGH
, T
SENS_CODE
(T
LOW
),
T
SENS_CODE
(T
HIGH
), and V
BG_CODE
(T
LOW
), are stored in device shadow flash memory during factory
test. This section details the registers where the values reside.
27.3.6.1 Temperature Calculation Constants Register 0 (TSENS_TCCR0)
This register contains the calibration temperatures and temperature sensor outputs measured during factory
calibration:
• T
HIGH
• T
SENS_CODE
(T
HIGH
)
• T
LOW
• T
SENS_CODE
(T
LOW
)
Figure 27-3. Temperature Calculation Constants Register 0 (TSENS_TCCR0)
Address: 0xFFFE_C000
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R TSCV2
W
RESET:
– – – – – – – – – – – – – – – –
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R TSCV1
W
RESET:
– – – – – – – – – – – – – – – –
= Unimplemented or Reserved