STM32H533CE datasheet(39/231 Pages) STMICROELECTRONICS

39 / 231 page

DS14539 Rev 1

39/231

STM32H533xx

Functional overview

3.22.1

Analog temperature sensor

This sensor generates a voltage (VSENSE) that varies linearly with temperature. It is

internally connected to an ADC input channel used to convert the 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 only temperature changes.

To improve the measurement accuracy, each device is individually factory-calibrated by ST.

The calibration data are stored in the system memory area, accessible in read-only mode.

3.22.2

Internal voltage reference (VREFINT)

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

the ADC. The VREFINT is internally connected to ADC input channel.

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.

3.22.3

VBAT battery voltage monitoring

This embedded hardware enables the application to measure the VBAT battery voltage using

ADC or input channel. As the VBAT voltage may be higher than the VDDA, and thus outside

the ADC input range, the VBAT pin is internally connected to a bridge divider by four. As a

consequence, the converted digital value is a quarter of the VBAT voltage.

3.23

Digital temperature sensor (DTS)

The devices embeds a sensor that converts the temperature into a square wave, whose

frequency is proportional to the temperature. The PCLK or the LSE clock can be used as

reference clock for the measurements. Use the formula given in the product reference

manual to calculate the temperature according to the measured frequency stored in the

DTS_DR register.

3.24

Digital to analog converter (DAC)

The DAC module is a 12-bit, voltage output digital-to-analog converter. The DAC can be

configured in 8- or 12-bit mode, and can be used in conjunction with the DMA controller. In

12-bit mode, the data may be left- or right-aligned.

The DAC features two output channels, each with its own converter. In dual DAC channel

mode, conversions can be done independently or simultaneously when both channels are

grouped together for synchronous update operations. An input reference pin, VREF+

(shared with others analog peripherals) is available for better resolution. An internal

reference can also be set on the same input.

The DAC_OUTx pin can be used as general purpose input/output (GPIO) when the DAC

output is disconnected from output pad and connected to on chip peripheral. The DAC

output buffer can be optionally enabled to allow a high drive output current. An individual

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