STM32WBA50KG datasheet(36/110 Pages) STMICROELECTRONICS

36 / 110 page

Functional overview

STM32WBA50KG

36/110

DS14688 Rev 1

•

ADC supply requirements: 1.62 to 3.6 V

•

ADC input range: VSSA < VIN < VDDA

Note:

The ADC4 analog block clock frequency after the ADC4 prescaler must be between

140 kHz and 55 MHz.

Note:

VSSA is connected to package pin VSS.

3.17.2

Temperature sensor (VSENSE)

The temperature sensor generates a voltage VSENSE that varies linearly with temperature.

The temperature sensor is internally connected to ADC4 input channel that is used to

convert the sensor output voltage into a digital value.

The sensor provides good linearity but it must be calibrated to obtain a good accuracy of the

temperature measurement. As the offset of the temperature sensor varies from chip to chip

due to process variation, the uncalibrated internal temperature sensor is suitable for

applications that detect temperature changes only.

To improve the accuracy of the temperature sensor measurement, each device is

individually factory-calibrated by ST. The temperature sensor factory calibration data are

stored by STMicroelectronics in the system memory area, accessible in read-only mode.

3.17.3

Internal voltage reference (VREFINT)

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

ADC. The VREFINT is internally connected to ADC4 input channel that is used to convert the

voltage into a digital value.

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

STMicroelectronics during production test and stored in the system memory area. It is

accessible in read-only mode.

3.18

Touch sensing controller (TSC)

The TSC (touch sensing controller) provides a simple solution to add capacitive sensing

functionality to any application. A capacitive sensing technology is able to detect finger

Table 11. Temperature sensor calibration values

Calibration

value name

Description

Memory address

TS_CAL1

Temperature sensor ADC4 12-bit raw data acquired at (30 ± 5) °C,

VDDA = 3.0 V (± 10 mV)

0x0BF9 0710 - 0x0BF9 0711

TS_CAL2

Temperature sensor ADC4 12-bit raw data acquired at (130 ± 5) °C,

VDDA = 3.0 V (± 10 mV)

0x0BF9 0742 - 0x0BF9 0743

Table 12. Internal voltage reference calibration values

Calibration

value name

Description

Memory address

VREFINT_CAL

Internal voltage reference ADC4 12-bit raw data acquired

at (30 ± 5) °C, VDDA = 3.0 V (± 10 mV)

0x0BF9 07A5 - 0x0BF9 07A6

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