NXP Semiconductors MPC5644A, Reference Manual, Page: 1233 / 1735

Temperature Sensor
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 1233
27.3.6.2 Temperature Calculation Constants Register 1 (TSENS_TCCR1)
This register contains the V
BG_CODE
(T
LOW
) parameter value used in the temperature calculation.
Table 27-1. Temperature Calculation Constants Register 0 (TSENS_TCCR0) field descriptions
Field Bits Description
TSCV2 0–15 Combination of encoded hot factory calibration temperature (T
HIGH
) and the temperature
sensor output at that temperature (TSENS_CODE(T
HIGH
)).
Bits 0–1 contain a value representing the hot factory calibration temperature (T
HIGH
).
The values are as follows:
• 00: T
HIGH
= Reserved
• 01: T
HIGH
= Reserved
• 10: T
HIGH
= 145 °C
• 11: T
HIGH
= 150 °C
Bits 2–15 are the temperature sensor voltage sampled and converted by the eQADC during
factory test with device at hot temperature (T
HIGH
). This is the T
SENS_CODE
(T
HIGH
)
parameter value referenced in the temperature calculation formula (see Figure 27-2 ).
Note: The reset value of this register is device-dependent. The value is set during factory
test.
TSCV1 16–31 Combination of encoded low factory calibration temperature (T
LOW
) and the temperature
sensor output at that temperature (TSENS_CODE(T
LOW
)).
Bits 16–17 contain a code indicating the value of T
LOW
. The values are as follows:
• 00: T
LOW
= 25 °C
• 01: T
LOW
= -40 °C
• 10: T
LOW
= Reserved
• 11: T
LOW
= Reserved
Bits 18–31 are the temperature sensor voltage sampled and converted by the eQADC
during factory test with device at the low calibration temperature. This is the
T
SENS_CODE
(T
LOW
) parameter value referenced in the temperature calculation formula (see
Figure 27-2 ).
Note: The reset value of this register is device-dependent. The value is set during factory
test.