STM32H725AE datasheet(36/283 Pages) STMICROELECTRONICS

36 / 283 page

Functional overview

STM32H725xE/G

36/282

DS13311 Rev 3

3.19

Analog-to-digital converters (ADCs)

STM32H725xE/G devices embed three analog-to-digital converters, two of 16-bit resolution,

and the third of 12-bit resolution. The 16-bit resolution ADCs can be configured as 16, 14,

12, 10 or 8 bits. The 12-bit resolution ADC can be configured to 12, 10 or 8 bits.

Each ADC shares up to 20 external channels, performing conversions in Single-shot or

Scan mode. In Scan mode, automatic conversion is performed on a selected group of

analog inputs.

Additional logic functions embedded in the ADC interface allow:

•

simultaneous sample and hold

•

Interleaved sample and hold

The ADC can be served by the DMA controller, thus allowing automatic transfer of ADC

converted values to a destination location without any software action.

In addition, an analog watchdog feature can accurately monitor the converted voltage of

one, some, or all selected channels. An interrupt is generated when the converted voltage is

outside the programmed thresholds.

To synchronize A/D conversion and timers, the ADCs can be triggered by any of the TIM1,

TIM2, TIM3, TIM4, TIM6, TIM8, TIM15, TIM23, TIM24, and LPTIM1 timers.

3.20

Temperature sensor

STM32H725xE/G devices embed a temperature sensor that generates a voltage (VTS) that

varies linearly with the temperature. This temperature sensor is internally connected to

ADC3_IN17. The conversion range is between 1.7 V and 3.6 V. It can measure the device

junction temperature ranging from

− 40 to +125°C.

The temperature sensor have a good linearity, but it has to be calibrated to obtain a good

overall accuracy of the temperature measurement. As the temperature sensor offset 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 ST in the System memory

area, which is accessible in Read-only mode.

3.21

Digital temperature sensor (DTS)

STM32H725xE/G devices embed a sensor that converts the temperature into a square

wave the frequency of which is proportional to the temperature. The PCLK or the LSE clock

can be used as the reference clock for the measurements. A formula given in the product

reference manual allows calculation of the temperature according to the measured

frequency stored in the DTS_DR register.

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