Table 108. Maximum Output Results Vs N And M. Grayed Values Indicates Truncation; Figure 82. Numerical Example With 5-Bits Shift And Rounding - ST STM32WL55JC Reference Manual

Analog-to-digital converter (ADC)
18.9 Temperature sensor and internal reference voltage
The temperature sensor can be used to measure the junction temperature (T
device. The temperature sensor is internally connected to the ADC V
which is used to convert the sensor's output voltage to a digital value. The sampling time for
the temperature sensor analog pin must be greater than the minimum T
specified in the datasheet. When not in use, the sensor can be put in power down mode.
The internal voltage reference (V
ADC and comparators. V
The precise voltage of V
production test and stored in the system memory area.
Figure 84
internal voltage reference and the ADC.
The TSEN bit must be set to enable the conversion of ADC V
and the VREFEN bit must be set to enable the conversion of ADC V
The temperature sensor output voltage changes linearly with temperature. The offset of this
line varies from chip to chip due to process variation (up to 45 °C from one chip to another).
The uncalibrated internal temperature sensor is more suited for applications that detect
temperature variations instead of absolute temperatures. To improve the accuracy of the
temperature sensor measurement, calibration values are stored in system memory for each
device by ST during production.
During the manufacturing process, the calibration data of the temperature sensor and the
internal voltage reference are stored in the system memory area. The user application can
then read them and use them to improve the accuracy of the temperature sensor or the
internal reference. Refer to the datasheet for additional information.
564/1454
Figure 83. Triggered oversampling mode (TOVS bit = 1)
Trigger
CONT = 0
Ch(N)
(DISCEN = 1)*
TOVS = 0
Trigger
CONT = 0
(DISCEN = 1)*
Ch(N)
0
TOVS = 1
(DISCEN = 1)*: DISCEN bit is forced to 1 by software when TOVS bit is set
REFINT
REFINT
shows the block diagram of connections between the temperature sensor, the
Ch(N) Ch(N) Ch(N)
0 1 2 3
EOC flag set
Trigger
Trigger Trigger
Ch(N) Ch(N)
Ch(N)
1 2
3
) provides a stable (bandgap) voltage output for the
REFINT
is internally connected to the ADC V
is individually measured for each part by ST during
RM0453 Rev 2
Trigger
Ch(N) Ch(N) Ch(N) Ch(N)
0 1 2 3
Trigger Trigger Trigger
Ch(N) Ch(N) Ch(N)
0 1 2
EOC flag set
[12] input channel
IN
S_temp
[13] input channel.
IN
[12] (temperature sensor)
IN
[13] (V
IN
RM0453
MS33700V1
) of the
J
value
).
REFINT