PXR40 Microcontroller Reference Manual, Rev. 1
Temperature Sensor
Freescale Semiconductor
34-4
34.3.3
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
Calculation Constants Register 1
, for details.
34.3.4
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).
34.3.5
Bandgap reference voltage (V
BG_CODE
(T))
V
BG
is the bandgap reference voltage. Software must sample the voltage from eQADC_A channel 145
(ADC0).
34.3.6
Registers
The calibration constants described previously, i.e.,
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.
34.3.6.1
Temperature Calculation Constants Register 0
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 34-3. Temperature Calculation Constants Register 0
The bit fields are described in
Address: 0xFFFE_C000
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
THIGH
TSCV2
W
RESET:
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
TLOW
TSCV1
W
RESET:
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
= Unimplemented or Reserved
Summary of Contents for PXR4030
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Page 30: ...PXR40 Microcontroller Reference Manual Rev 1 Freescale Semiconductor xxx...
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