STM32H757AI datasheet(35/251 Pages) STMICROELECTRONICS

35 / 251 page

DS12931 Rev 1

35/251

STM32H757xI

Functional overview

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 could be triggered by any of TIM1,

TIM2, TIM3, TIM4, TIM6, TIM8, TIM15, HRTIM1 and LPTIM1 timer.

3.18

Temperature sensor

STM32H757xI devices embed a temperature sensor that generates a voltage (VTS) that

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

ADC3_IN18. The conversion range is between 1.7 V and 3.6 V. It can measure the device

junction temperature ranging from

− 40 up 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.

3.19

VBAT operation

The VBAT power domain contains the RTC, the backup registers and the backup SRAM.

To optimize battery duration, this power domain is supplied by VDD when available or by the

voltage applied on VBAT pin (when VDD supply is not present). VBAT power is switched

when the PDR detects that VDD dropped below the PDR level.

The voltage on the VBAT pin could be provided by an external battery, a supercapacitor or

directly by VDD, in which case, the VBAT mode is not functional.

VBAT operation is activated when VDD is not present.

The VBAT pin supplies the RTC, the backup registers and the backup SRAM.

Note:

When the microcontroller is supplied from VBAT, external interrupts and RTC alarm/events

do not exit it from VBAT operation.

When PDR_ON pin is connected to VSS (Internal Reset OFF), the VBAT functionality is no

more available and VBAT pin should be connected to VDD.

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