STM32WB15CC datasheet(39/127 Pages) STMICROELECTRONICS

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DS13258 Rev 4

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STM32WB15CC

Functional overview

3.14.2

Internal voltage reference (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for

the ADC and the comparator. VREFINT is internally connected to the ADC1_IN13 input

channel. The precise voltage of VREFINT is individually measured for each part by ST

during production test and stored in the system memory area. It is accessible in read-only

mode.

3.15

Comparator (COMP)

The STM32WB15CC devices embeds a comparator with programmable reference voltage

(internal or external), hysteresis and speed (low speed for low-power) and with selectable

output polarity.

The reference voltage can be one of the following:



External I/O



Internal reference voltage or submultiple (1/4, 1/2, 3/4).

The comparator can wake up from Stop mode, generate interrupts and breaks for the timers

and can be also combined into a window comparator.

3.16

Touch sensing controller (TSC)

The touch sensing controller provides a simple solution for adding capacitive sensing

functionality to any application. Capacitive sensing technology is able to detect finger

presence near an electrode which is protected from direct touch by a dielectric such as

glass or plastic. The capacitive variation introduced by the finger (or any conductive object)

is measured using a proven implementation based on a surface charge transfer acquisition

principle.

The touch sensing controller is fully supported by the STMTouch touch sensing firmware

library (free to use) and enables reliable touch sensing functionality in the end application.

Table 10. Temperature sensor calibration values

Calibration value name

Description

Memory address

TS_CAL1

TS ADC raw data acquired at a

temperature of 30 °C (± 5 °C),

VDDA = 3.0 V (± 10 mV)

0x1FFF 75A8 - 0x1FFF 75A9

TS_CAL2

TS ADC raw data acquired at a

temperature of 130 °C (± 5 °C),

VDDA = 3.0 V (± 10 mV)

0x1FFF 75CA - 0x1FFF 75CB

Table 11. Internal voltage reference calibration values

Calibration value name

Description

Memory address

VREFINT

Raw data acquired at a

temperature of 30 °C (± 5 °C),

VDDA = 3.6 V (± 10 mV)

0x1FFF 75AA - 0x1FFF 75AB

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